Tuesday, 17 November
Acceleration and collimation of relativistic MHD disk winds
http://www.arxiv.org/abs/0911.3001
O. Porth,
C. Fendt
submitted to ApJ
We perform axisymmetric relativistic magnetohydrodynamic (MHD) simulations to
investigate the acceleration and collimation of jets and outflows from disks
around compact objects.
(more)
17 11 09 - 17:33 |
No comments
An Efficient Method for Modeling High Magnification Planetary
Microlensing Events
http://www.arxiv.org/abs/0911.2703
David P. Bennett
31 pages, including 5 figures, submitted to ApJ
I present a previously unpublished method for calculating light curves for
high magnification planetary microlensing events that is designed to be
efficient enough to handle complicated microlensing events, which include more
than two lens masses and lens orbital motion.
(more)
17 11 09 - 17:24 |
No comments
Monday, 16 November
A turbulence model for smoothed particle hydrodynamics
http://www.arxiv.org/abs/0911.2523
J. J. Monaghan
34 pages, 11 figures
The aim of this paper is to devise a turbulence model for the particle method
Smoothed Particle Hydrodynamics (SPH) which makes few assumptions, conserves
linear and angular momentum, satisfies a discrete version of Kelvin's
circulation theorem, and is computationally efficient.
(more)
16 11 09 - 13:17 |
No comments
Sunday, 15 November
The case for AGN feedback in galaxy groups
http://www.arxiv.org/abs/0911.2641
Ian G. McCarthy,
Joop Schaye,
Trevor J. Ponman,
Richard G. Bower,
Craig M. Booth,
Claudio Dalla Vecchia,
Robert A. Crain,
Volker Springel,
Tom Theuns,
Robert P. C. Wiersma
20 pages, 13 figures, submitted to MNRAS
[Abridged] The relatively recent insight that energy input from supermassive
black holes (BHs) can have a substantial effect on the star formation rates
(SFRs) of galaxies motivates us to examine its effects on the scale of galaxy
groups.
(more)
15 11 09 - 21:15 |
No comments
Spectro-Perfectionism: An Algorithmic Framework for Photon Noise-Limited
Extraction of Optical Fiber Spectroscopy
http://www.arxiv.org/abs/0911.2689
Adam S. Bolton (Utah),
David J. Schlegel (LBL)
8 pages, 4 figures, emulateapj; submitted to PASP; comments welcome
We describe a new algorithm for the "perfect" extraction of one-dimensional
spectra from two-dimensional CCD images of optical fiber spectrographs, based
on accurate two-dimensional (2D) forward modeling of the raw pixel data.
(more)
15 11 09 - 21:15 |
No comments
Turbulence modeling and the physics of the intra-cluster medium
http://www.arxiv.org/abs/0911.2629
L. Iapichino (1),
A. Maier (2),
W. Schmidt (3),
J. C. Niemeyer (3) ((1) ZAH/ITA, Univ. Heidelberg; (2) Lehrstuhl für Astronomie, Univ. Würzburg; (3) Institut für Astrophysik, Univ. Göttingen)
To appear in the proceedings of the "Invisible Universe International Conference"
FEARLESS (Fluid mEchanics with Adaptively Refined Large Eddy SimulationS) is
a new numerical scheme arising from the combined use of subgrid scale (SGS)
model for turbulence at the unresolved length scales and adaptive mesh
refinement (AMR) for resolving the large scales.
(more)
15 11 09 - 21:14 |
No comments
Discarded low energy particles in extensive air shower simulations:
Effect on the shower Energy Deposit
http://www.arxiv.org/abs/0911.2535
M. J. Tueros
15 pages, 7 figures, submited to Journal of physics G
The simulation of particle cascades initiated in the atmosphere by ultra high
energy cosmic ray particles involves the generation and propagation of a huge
amount of particles.
(more)
15 11 09 - 21:13 |
No comments
Detecting the orientation of magnetic fields in galaxy clusters
http://www.arxiv.org/abs/0911.2476
Christoph Pfrommer (1),
L. Jonathan Dursi (2, 1), ((1) CITA, (2) SciNet)
this http URL
Clusters of galaxies, filled with hot, magnetised plasma, are the largest
bound objects in existence and an important touchstone in understanding the
formation of structures in our Universe.
(more)
15 11 09 - 21:00 |
No comments
Detecting the orientation of magnetic fields in galaxy clusters
http://www.arxiv.org/abs/0911.2476
Christoph Pfrommer (1),
L. Jonathan Dursi (2, 1), ((1) CITA, (2) SciNet)
this http URL
Clusters of galaxies, filled with hot, magnetised plasma, are the largest
bound objects in existence and an important touchstone in understanding the
formation of structures in our Universe.
(more)
15 11 09 - 20:57 |
No comments
Detecting the orientation of magnetic fields in galaxy clusters
http://www.arxiv.org/abs/0911.2476
Christoph Pfrommer (1),
L. Jonathan Dursi (2, 1), ((1) CITA, (2) SciNet)
this http URL
Clusters of galaxies, filled with hot, magnetised plasma, are the largest
bound objects in existence and an important touchstone in understanding the
formation of structures in our Universe.
(more)
15 11 09 - 20:44 |
No comments
Interactions between a massive planet and a disc
http://www.arxiv.org/abs/0911.2468
Pau Amaro-Seoane,
Ignasi Ribas,
Ulf Loeckmann,
Holger Baumgardt
Two-page contribution to "Pathways towards habitable planets". An extended version of this note will be soon published in ApJ (needs asp2006.sty, psfig.sty and picins.sty, included)
We analyse the potential migration of massive planets forming far away from
an inner planetary system.
(more)
15 11 09 - 20:43 |
No comments
Thursday, 12 November
Simulations of momentum feedback by black hole winds
http://www.arxiv.org/abs/0911.2434
Sergei Nayakshin,
Chris Power (Leicester)
17 pages, to appear in MNRAS
The observed super-massive black hole (SMBH) mass -- galaxy velocity
dispersion ($M_{\rm bh} - \sigma$) correlation may be established when
winds/outflows from the SMBH drive gas out of the potential wells of classical
bulges.
(more)
12 11 09 - 22:40 |
No comments
Scaled solar tracks and isochrones in a large region of the Z-Y plane.
II. From 2.5 to 20 solar masses
http://www.arxiv.org/abs/0911.2419
G. Bertelli (1),
E. Nasi (1),
L. Girardi (1),
P. Marigo (2) ((1) INAF - Padova Astronomical Observatory, (2) Astronomical Department, Padova University)
17 pages, 18 figures, accepted for publication in A&A
We extend our theoretical computations for low-mass stars to
intermediate-mass and massive stars, for which few databases exist in the
literature.
(more)
12 11 09 - 22:39 |
No comments
Gas Accretion from a Circumbinary Disk
http://www.arxiv.org/abs/0911.2032
Tomoyuki Hanawa,
Yasuhiro Ochi,
Koichi Ando
41 pages, 25 PostScript figures, uses AASTeX, to appear in ApJ
A new computational scheme is developed to study gas accretion from a
circumbinary disk.
(more)
12 11 09 - 22:35 |
No comments
Fast and Large Volume Simulations of the 21 cm Signal from the
Reionization and pre-Reionization Epochs
http://www.arxiv.org/abs/0911.2219
M. G. Santos (1),
L. Ferramacho (1),
M. B. Silva (1),
A. Amblard (2),
A. Cooray (2) ((1) CENTRA - IST, (2) UC Irvine)
14 pages and 15 figures
While limited to low spatial resolution, the next generation low-frequency
radio interferometers that target 21 cm observations during the era of
reionization and prior will have instantaneous fields-of-view that are many
tens of square degrees on the sky.
(more)
12 11 09 - 22:32 |
No comments
Tuesday, 10 November
Radiation thermo-chemical models of protoplanetary disks II. Line
diagnostics
http://www.arxiv.org/abs/0911.1949
I. Kamp,
I. Tilling,
P. Woitke,
W.-F. Thi,
M. Hogerheijde
accepted for publication in A&A
Methods.
(more)
10 11 09 - 22:21 |
No comments
Solar-Terrestrial Simulations of CMEs with a Realistic Initiation
Mechanism: Case Study for Active Region 10069
http://www.arxiv.org/abs/0911.1895
N. Lugaz,
I. I. Roussev,
I. V. Sokolov,
C. Jacobs
4 pages, 2 figures, refereed proceedings for Solar Wind 12
Most simulations of coronal mass ejections (CMEs) to date either focus on the
interplanetary propagation of a giant plasma "blob" without paying too much
attention to its origin and to the formation process or they focus on the
complex evolution of the coronal magnetic field due to (sub-)photospheric
motions which result in an eruption.
(more)
10 11 09 - 22:20 |
No comments
Exploring the $P_{cyc}$ vs $P_{rot}$ relation with flux transport dynamo
models of solar-like stars
http://www.arxiv.org/abs/0911.1947
L. Jouve (1,2),
B.P. Brown (3),
A.S. Brun (1,3)
12 pages, 8 figures, accepted for publication by A&A 1: AIM, CEA/DSM-CNRS-Univ. Paris 7, IRFU/SAp, France, 2: D.A.M.T.P., Centre for Mathematical Sciences, Univ. of Cambridge, UK, 3: JILA and Department of Astrophysical and Planetary Sciences, Univ. of Colorado, USA
Aims: To understand stellar magnetism and to test the validity of the
Babcock-Leighton flux transport mean field dynamo models with stellar activity
observations Methods: 2-D mean field dynamo models at various rotation rates
are computed with the STELEM code to study the sensitivity of the activity
cycle period and butterfly diagram to parameter changes and are compared to
observational data.
(more)
10 11 09 - 22:20 |
No comments
Virtual Observatory: Science capabilities and scientific results
http://www.arxiv.org/abs/0911.1878
Evanthia Hatziminaoglou (ESO, Garching)
10 pages, 5 figures, invited talk, proceedings of the 9th Hellenic Astronomical Society Conference, Athens, 20-24 September 2009
The virtual observatory (VO) is a collection of interoperable data archives,
tools and applications that together form an environment in which original
astronomical research can be carried out.
(more)
10 11 09 - 22:19 |
No comments
Revisiting 2D Numerical Models for the 19th century outbursts of $\eta$
Carinae
http://www.arxiv.org/abs/0911.1808
R.F. González,
A.M. Villa,
G.C. Gómez,
E.M. de Gouveia Dal Pino,
A.C. Raga,
J. Cantó,
P.F. Velázquez,
E. de la Fuente
accepted for publication in MNRAS
We present here new results of two-dimensional hydrodynamical simulations of
the eruptive events of the 1840s (the great) and the 1890s (the minor)
eruptions suffered by the massive star $\eta$ Car.
(more)
10 11 09 - 22:19 |
No comments
Structure, Kinematics, and Chemical Enrichment Patterns after Major
Gas-Rich Disc-Disc Mergers
http://www.arxiv.org/abs/0911.1801
Simon Richard,
Chris B. Brook,
Hugo Martel,
Daisuke Kawata,
Brad K. Gibson,
Patricia Sanchez-Blazquez
17 pages, 20 figures, to be published in MNRAS
We used an N-body smoothed particle hydrodynamics algorithm, with a detailed
treatment of star formation, supernovae feedback, and chemical enrichment, to
perform eight simulations of mergers between gas-rich disc galaxies.
(more)
10 11 09 - 22:18 |
No comments
Dependence of the Star Formation Efficiency on the Parameters of
Molecular Cloud Formation Simulations
http://www.arxiv.org/abs/0911.1795
Yetli Rosas-Guevara,
Enrique Vazquez-Semadeni,
Gilberto C. Gomez,
A.-Katharina Jappsen
19 pages, submitted to MNRAS
We investigate the response of the star formation efficiency (SFE) to the
main parameters of simulations of molecular cloud formation by the collision of
warm diffuse medium (WNM) cylindrical streams, neglecting stellar feedback and
magnetic fields.
(more)
10 11 09 - 22:17 |
No comments
Chemical Evolution in Hierarchical Models of Cosmic Structure II: The
Formation of the Milky Way Stellar Halo and the Distribution of the Oldest
Stars
http://www.arxiv.org/abs/0911.1786
Jason Tumlinson (STScI)
Submitted to ApJ, 22 pages emulateapj, 15 color figures
This paper presents theoretical star formation and chemical enrichment
histories for the stellar halo of the Milky Way based on new chemodynamical
modeling.
(more)
10 11 09 - 22:15 |
No comments
Computing the Bayesian Evidence from a Markov Chain Monte Carlo
Simulation of the Posterior Distribution
http://www.arxiv.org/abs/0911.1777
Martin D. Weinberg
22 pages, 6 figures, submitted to Bayesian Analysis
Computation of the marginal likelihood or "Bayesian Evidence" from a
simulated posterior distribution is central to Bayesian model selection but is
fraught with difficulty.
(more)
10 11 09 - 22:15 |
No comments
Monday, 09 November
A Simultaneous Stacking and Deblending Algorithm for Astronomical Images
http://www.arxiv.org/abs/0911.1592
Peter Kurczynski,
Eric Gawiser
submitted to The Astronomical Journal. 18 pages, 6 figures
Stacking analysis is a means of detecting faint sources using a priori
position information to estimate an aggregate signal from individually
undetected objects.
(more)
09 11 09 - 23:39 |
No comments
Acceleration and collimation of relativistic MHD disk winds
http://www.arxiv.org/abs/0911.3001O. Porth, C. Fendt
submitted to ApJ
We perform axisymmetric relativistic magnetohydrodynamic (MHD) simulations to investigate the acceleration and collimation of jets and outflows from disks around compact objects.
(more)
17 11 09 - 17:33 |
No comments
An Efficient Method for Modeling High Magnification Planetary
Microlensing Events
http://www.arxiv.org/abs/0911.2703
David P. Bennett
31 pages, including 5 figures, submitted to ApJ
I present a previously unpublished method for calculating light curves for
high magnification planetary microlensing events that is designed to be
efficient enough to handle complicated microlensing events, which include more
than two lens masses and lens orbital motion.
(more)
17 11 09 - 17:24 |
No comments
Monday, 16 November
A turbulence model for smoothed particle hydrodynamics
http://www.arxiv.org/abs/0911.2523
J. J. Monaghan
34 pages, 11 figures
The aim of this paper is to devise a turbulence model for the particle method
Smoothed Particle Hydrodynamics (SPH) which makes few assumptions, conserves
linear and angular momentum, satisfies a discrete version of Kelvin's
circulation theorem, and is computationally efficient.
(more)
16 11 09 - 13:17 |
No comments
Sunday, 15 November
The case for AGN feedback in galaxy groups
http://www.arxiv.org/abs/0911.2641
Ian G. McCarthy,
Joop Schaye,
Trevor J. Ponman,
Richard G. Bower,
Craig M. Booth,
Claudio Dalla Vecchia,
Robert A. Crain,
Volker Springel,
Tom Theuns,
Robert P. C. Wiersma
20 pages, 13 figures, submitted to MNRAS
[Abridged] The relatively recent insight that energy input from supermassive
black holes (BHs) can have a substantial effect on the star formation rates
(SFRs) of galaxies motivates us to examine its effects on the scale of galaxy
groups.
(more)
15 11 09 - 21:15 |
No comments
Spectro-Perfectionism: An Algorithmic Framework for Photon Noise-Limited
Extraction of Optical Fiber Spectroscopy
http://www.arxiv.org/abs/0911.2689
Adam S. Bolton (Utah),
David J. Schlegel (LBL)
8 pages, 4 figures, emulateapj; submitted to PASP; comments welcome
We describe a new algorithm for the "perfect" extraction of one-dimensional
spectra from two-dimensional CCD images of optical fiber spectrographs, based
on accurate two-dimensional (2D) forward modeling of the raw pixel data.
(more)
15 11 09 - 21:15 |
No comments
Turbulence modeling and the physics of the intra-cluster medium
http://www.arxiv.org/abs/0911.2629
L. Iapichino (1),
A. Maier (2),
W. Schmidt (3),
J. C. Niemeyer (3) ((1) ZAH/ITA, Univ. Heidelberg; (2) Lehrstuhl für Astronomie, Univ. Würzburg; (3) Institut für Astrophysik, Univ. Göttingen)
To appear in the proceedings of the "Invisible Universe International Conference"
FEARLESS (Fluid mEchanics with Adaptively Refined Large Eddy SimulationS) is
a new numerical scheme arising from the combined use of subgrid scale (SGS)
model for turbulence at the unresolved length scales and adaptive mesh
refinement (AMR) for resolving the large scales.
(more)
15 11 09 - 21:14 |
No comments
Discarded low energy particles in extensive air shower simulations:
Effect on the shower Energy Deposit
http://www.arxiv.org/abs/0911.2535
M. J. Tueros
15 pages, 7 figures, submited to Journal of physics G
The simulation of particle cascades initiated in the atmosphere by ultra high
energy cosmic ray particles involves the generation and propagation of a huge
amount of particles.
(more)
15 11 09 - 21:13 |
No comments
Detecting the orientation of magnetic fields in galaxy clusters
http://www.arxiv.org/abs/0911.2476
Christoph Pfrommer (1),
L. Jonathan Dursi (2, 1), ((1) CITA, (2) SciNet)
this http URL
Clusters of galaxies, filled with hot, magnetised plasma, are the largest
bound objects in existence and an important touchstone in understanding the
formation of structures in our Universe.
(more)
15 11 09 - 21:00 |
No comments
Detecting the orientation of magnetic fields in galaxy clusters
http://www.arxiv.org/abs/0911.2476
Christoph Pfrommer (1),
L. Jonathan Dursi (2, 1), ((1) CITA, (2) SciNet)
this http URL
Clusters of galaxies, filled with hot, magnetised plasma, are the largest
bound objects in existence and an important touchstone in understanding the
formation of structures in our Universe.
(more)
15 11 09 - 20:57 |
No comments
Detecting the orientation of magnetic fields in galaxy clusters
http://www.arxiv.org/abs/0911.2476
Christoph Pfrommer (1),
L. Jonathan Dursi (2, 1), ((1) CITA, (2) SciNet)
this http URL
Clusters of galaxies, filled with hot, magnetised plasma, are the largest
bound objects in existence and an important touchstone in understanding the
formation of structures in our Universe.
(more)
15 11 09 - 20:44 |
No comments
Interactions between a massive planet and a disc
http://www.arxiv.org/abs/0911.2468
Pau Amaro-Seoane,
Ignasi Ribas,
Ulf Loeckmann,
Holger Baumgardt
Two-page contribution to "Pathways towards habitable planets". An extended version of this note will be soon published in ApJ (needs asp2006.sty, psfig.sty and picins.sty, included)
We analyse the potential migration of massive planets forming far away from
an inner planetary system.
(more)
15 11 09 - 20:43 |
No comments
Thursday, 12 November
Simulations of momentum feedback by black hole winds
http://www.arxiv.org/abs/0911.2434
Sergei Nayakshin,
Chris Power (Leicester)
17 pages, to appear in MNRAS
The observed super-massive black hole (SMBH) mass -- galaxy velocity
dispersion ($M_{\rm bh} - \sigma$) correlation may be established when
winds/outflows from the SMBH drive gas out of the potential wells of classical
bulges.
(more)
12 11 09 - 22:40 |
No comments
Scaled solar tracks and isochrones in a large region of the Z-Y plane.
II. From 2.5 to 20 solar masses
http://www.arxiv.org/abs/0911.2419
G. Bertelli (1),
E. Nasi (1),
L. Girardi (1),
P. Marigo (2) ((1) INAF - Padova Astronomical Observatory, (2) Astronomical Department, Padova University)
17 pages, 18 figures, accepted for publication in A&A
We extend our theoretical computations for low-mass stars to
intermediate-mass and massive stars, for which few databases exist in the
literature.
(more)
12 11 09 - 22:39 |
No comments
Gas Accretion from a Circumbinary Disk
http://www.arxiv.org/abs/0911.2032
Tomoyuki Hanawa,
Yasuhiro Ochi,
Koichi Ando
41 pages, 25 PostScript figures, uses AASTeX, to appear in ApJ
A new computational scheme is developed to study gas accretion from a
circumbinary disk.
(more)
12 11 09 - 22:35 |
No comments
Fast and Large Volume Simulations of the 21 cm Signal from the
Reionization and pre-Reionization Epochs
http://www.arxiv.org/abs/0911.2219
M. G. Santos (1),
L. Ferramacho (1),
M. B. Silva (1),
A. Amblard (2),
A. Cooray (2) ((1) CENTRA - IST, (2) UC Irvine)
14 pages and 15 figures
While limited to low spatial resolution, the next generation low-frequency
radio interferometers that target 21 cm observations during the era of
reionization and prior will have instantaneous fields-of-view that are many
tens of square degrees on the sky.
(more)
12 11 09 - 22:32 |
No comments
Tuesday, 10 November
Radiation thermo-chemical models of protoplanetary disks II. Line
diagnostics
http://www.arxiv.org/abs/0911.1949
I. Kamp,
I. Tilling,
P. Woitke,
W.-F. Thi,
M. Hogerheijde
accepted for publication in A&A
Methods.
(more)
10 11 09 - 22:21 |
No comments
Solar-Terrestrial Simulations of CMEs with a Realistic Initiation
Mechanism: Case Study for Active Region 10069
http://www.arxiv.org/abs/0911.1895
N. Lugaz,
I. I. Roussev,
I. V. Sokolov,
C. Jacobs
4 pages, 2 figures, refereed proceedings for Solar Wind 12
Most simulations of coronal mass ejections (CMEs) to date either focus on the
interplanetary propagation of a giant plasma "blob" without paying too much
attention to its origin and to the formation process or they focus on the
complex evolution of the coronal magnetic field due to (sub-)photospheric
motions which result in an eruption.
(more)
10 11 09 - 22:20 |
No comments
Exploring the $P_{cyc}$ vs $P_{rot}$ relation with flux transport dynamo
models of solar-like stars
http://www.arxiv.org/abs/0911.1947
L. Jouve (1,2),
B.P. Brown (3),
A.S. Brun (1,3)
12 pages, 8 figures, accepted for publication by A&A 1: AIM, CEA/DSM-CNRS-Univ. Paris 7, IRFU/SAp, France, 2: D.A.M.T.P., Centre for Mathematical Sciences, Univ. of Cambridge, UK, 3: JILA and Department of Astrophysical and Planetary Sciences, Univ. of Colorado, USA
Aims: To understand stellar magnetism and to test the validity of the
Babcock-Leighton flux transport mean field dynamo models with stellar activity
observations Methods: 2-D mean field dynamo models at various rotation rates
are computed with the STELEM code to study the sensitivity of the activity
cycle period and butterfly diagram to parameter changes and are compared to
observational data.
(more)
10 11 09 - 22:20 |
No comments
Virtual Observatory: Science capabilities and scientific results
http://www.arxiv.org/abs/0911.1878
Evanthia Hatziminaoglou (ESO, Garching)
10 pages, 5 figures, invited talk, proceedings of the 9th Hellenic Astronomical Society Conference, Athens, 20-24 September 2009
The virtual observatory (VO) is a collection of interoperable data archives,
tools and applications that together form an environment in which original
astronomical research can be carried out.
(more)
10 11 09 - 22:19 |
No comments
Revisiting 2D Numerical Models for the 19th century outbursts of $\eta$
Carinae
http://www.arxiv.org/abs/0911.1808
R.F. González,
A.M. Villa,
G.C. Gómez,
E.M. de Gouveia Dal Pino,
A.C. Raga,
J. Cantó,
P.F. Velázquez,
E. de la Fuente
accepted for publication in MNRAS
We present here new results of two-dimensional hydrodynamical simulations of
the eruptive events of the 1840s (the great) and the 1890s (the minor)
eruptions suffered by the massive star $\eta$ Car.
(more)
10 11 09 - 22:19 |
No comments
Structure, Kinematics, and Chemical Enrichment Patterns after Major
Gas-Rich Disc-Disc Mergers
http://www.arxiv.org/abs/0911.1801
Simon Richard,
Chris B. Brook,
Hugo Martel,
Daisuke Kawata,
Brad K. Gibson,
Patricia Sanchez-Blazquez
17 pages, 20 figures, to be published in MNRAS
We used an N-body smoothed particle hydrodynamics algorithm, with a detailed
treatment of star formation, supernovae feedback, and chemical enrichment, to
perform eight simulations of mergers between gas-rich disc galaxies.
(more)
10 11 09 - 22:18 |
No comments
Dependence of the Star Formation Efficiency on the Parameters of
Molecular Cloud Formation Simulations
http://www.arxiv.org/abs/0911.1795
Yetli Rosas-Guevara,
Enrique Vazquez-Semadeni,
Gilberto C. Gomez,
A.-Katharina Jappsen
19 pages, submitted to MNRAS
We investigate the response of the star formation efficiency (SFE) to the
main parameters of simulations of molecular cloud formation by the collision of
warm diffuse medium (WNM) cylindrical streams, neglecting stellar feedback and
magnetic fields.
(more)
10 11 09 - 22:17 |
No comments
Chemical Evolution in Hierarchical Models of Cosmic Structure II: The
Formation of the Milky Way Stellar Halo and the Distribution of the Oldest
Stars
http://www.arxiv.org/abs/0911.1786
Jason Tumlinson (STScI)
Submitted to ApJ, 22 pages emulateapj, 15 color figures
This paper presents theoretical star formation and chemical enrichment
histories for the stellar halo of the Milky Way based on new chemodynamical
modeling.
(more)
10 11 09 - 22:15 |
No comments
Computing the Bayesian Evidence from a Markov Chain Monte Carlo
Simulation of the Posterior Distribution
http://www.arxiv.org/abs/0911.1777
Martin D. Weinberg
22 pages, 6 figures, submitted to Bayesian Analysis
Computation of the marginal likelihood or "Bayesian Evidence" from a
simulated posterior distribution is central to Bayesian model selection but is
fraught with difficulty.
(more)
10 11 09 - 22:15 |
No comments
Monday, 09 November
A Simultaneous Stacking and Deblending Algorithm for Astronomical Images
http://www.arxiv.org/abs/0911.1592
Peter Kurczynski,
Eric Gawiser
submitted to The Astronomical Journal. 18 pages, 6 figures
Stacking analysis is a means of detecting faint sources using a priori
position information to estimate an aggregate signal from individually
undetected objects.
(more)
09 11 09 - 23:39 |
No comments
An Efficient Method for Modeling High Magnification Planetary Microlensing Events
http://www.arxiv.org/abs/0911.2703David P. Bennett
31 pages, including 5 figures, submitted to ApJ
I present a previously unpublished method for calculating light curves for high magnification planetary microlensing events that is designed to be efficient enough to handle complicated microlensing events, which include more than two lens masses and lens orbital motion.
(more)
17 11 09 - 17:24 |
No comments
Monday, 16 November
A turbulence model for smoothed particle hydrodynamics
http://www.arxiv.org/abs/0911.2523
J. J. Monaghan
34 pages, 11 figures
The aim of this paper is to devise a turbulence model for the particle method
Smoothed Particle Hydrodynamics (SPH) which makes few assumptions, conserves
linear and angular momentum, satisfies a discrete version of Kelvin's
circulation theorem, and is computationally efficient.
(more)
16 11 09 - 13:17 |
No comments
Sunday, 15 November
The case for AGN feedback in galaxy groups
http://www.arxiv.org/abs/0911.2641
Ian G. McCarthy,
Joop Schaye,
Trevor J. Ponman,
Richard G. Bower,
Craig M. Booth,
Claudio Dalla Vecchia,
Robert A. Crain,
Volker Springel,
Tom Theuns,
Robert P. C. Wiersma
20 pages, 13 figures, submitted to MNRAS
[Abridged] The relatively recent insight that energy input from supermassive
black holes (BHs) can have a substantial effect on the star formation rates
(SFRs) of galaxies motivates us to examine its effects on the scale of galaxy
groups.
(more)
15 11 09 - 21:15 |
No comments
Spectro-Perfectionism: An Algorithmic Framework for Photon Noise-Limited
Extraction of Optical Fiber Spectroscopy
http://www.arxiv.org/abs/0911.2689
Adam S. Bolton (Utah),
David J. Schlegel (LBL)
8 pages, 4 figures, emulateapj; submitted to PASP; comments welcome
We describe a new algorithm for the "perfect" extraction of one-dimensional
spectra from two-dimensional CCD images of optical fiber spectrographs, based
on accurate two-dimensional (2D) forward modeling of the raw pixel data.
(more)
15 11 09 - 21:15 |
No comments
Turbulence modeling and the physics of the intra-cluster medium
http://www.arxiv.org/abs/0911.2629
L. Iapichino (1),
A. Maier (2),
W. Schmidt (3),
J. C. Niemeyer (3) ((1) ZAH/ITA, Univ. Heidelberg; (2) Lehrstuhl für Astronomie, Univ. Würzburg; (3) Institut für Astrophysik, Univ. Göttingen)
To appear in the proceedings of the "Invisible Universe International Conference"
FEARLESS (Fluid mEchanics with Adaptively Refined Large Eddy SimulationS) is
a new numerical scheme arising from the combined use of subgrid scale (SGS)
model for turbulence at the unresolved length scales and adaptive mesh
refinement (AMR) for resolving the large scales.
(more)
15 11 09 - 21:14 |
No comments
Discarded low energy particles in extensive air shower simulations:
Effect on the shower Energy Deposit
http://www.arxiv.org/abs/0911.2535
M. J. Tueros
15 pages, 7 figures, submited to Journal of physics G
The simulation of particle cascades initiated in the atmosphere by ultra high
energy cosmic ray particles involves the generation and propagation of a huge
amount of particles.
(more)
15 11 09 - 21:13 |
No comments
Detecting the orientation of magnetic fields in galaxy clusters
http://www.arxiv.org/abs/0911.2476
Christoph Pfrommer (1),
L. Jonathan Dursi (2, 1), ((1) CITA, (2) SciNet)
this http URL
Clusters of galaxies, filled with hot, magnetised plasma, are the largest
bound objects in existence and an important touchstone in understanding the
formation of structures in our Universe.
(more)
15 11 09 - 21:00 |
No comments
Detecting the orientation of magnetic fields in galaxy clusters
http://www.arxiv.org/abs/0911.2476
Christoph Pfrommer (1),
L. Jonathan Dursi (2, 1), ((1) CITA, (2) SciNet)
this http URL
Clusters of galaxies, filled with hot, magnetised plasma, are the largest
bound objects in existence and an important touchstone in understanding the
formation of structures in our Universe.
(more)
15 11 09 - 20:57 |
No comments
Detecting the orientation of magnetic fields in galaxy clusters
http://www.arxiv.org/abs/0911.2476
Christoph Pfrommer (1),
L. Jonathan Dursi (2, 1), ((1) CITA, (2) SciNet)
this http URL
Clusters of galaxies, filled with hot, magnetised plasma, are the largest
bound objects in existence and an important touchstone in understanding the
formation of structures in our Universe.
(more)
15 11 09 - 20:44 |
No comments
Interactions between a massive planet and a disc
http://www.arxiv.org/abs/0911.2468
Pau Amaro-Seoane,
Ignasi Ribas,
Ulf Loeckmann,
Holger Baumgardt
Two-page contribution to "Pathways towards habitable planets". An extended version of this note will be soon published in ApJ (needs asp2006.sty, psfig.sty and picins.sty, included)
We analyse the potential migration of massive planets forming far away from
an inner planetary system.
(more)
15 11 09 - 20:43 |
No comments
Thursday, 12 November
Simulations of momentum feedback by black hole winds
http://www.arxiv.org/abs/0911.2434
Sergei Nayakshin,
Chris Power (Leicester)
17 pages, to appear in MNRAS
The observed super-massive black hole (SMBH) mass -- galaxy velocity
dispersion ($M_{\rm bh} - \sigma$) correlation may be established when
winds/outflows from the SMBH drive gas out of the potential wells of classical
bulges.
(more)
12 11 09 - 22:40 |
No comments
Scaled solar tracks and isochrones in a large region of the Z-Y plane.
II. From 2.5 to 20 solar masses
http://www.arxiv.org/abs/0911.2419
G. Bertelli (1),
E. Nasi (1),
L. Girardi (1),
P. Marigo (2) ((1) INAF - Padova Astronomical Observatory, (2) Astronomical Department, Padova University)
17 pages, 18 figures, accepted for publication in A&A
We extend our theoretical computations for low-mass stars to
intermediate-mass and massive stars, for which few databases exist in the
literature.
(more)
12 11 09 - 22:39 |
No comments
Gas Accretion from a Circumbinary Disk
http://www.arxiv.org/abs/0911.2032
Tomoyuki Hanawa,
Yasuhiro Ochi,
Koichi Ando
41 pages, 25 PostScript figures, uses AASTeX, to appear in ApJ
A new computational scheme is developed to study gas accretion from a
circumbinary disk.
(more)
12 11 09 - 22:35 |
No comments
Fast and Large Volume Simulations of the 21 cm Signal from the
Reionization and pre-Reionization Epochs
http://www.arxiv.org/abs/0911.2219
M. G. Santos (1),
L. Ferramacho (1),
M. B. Silva (1),
A. Amblard (2),
A. Cooray (2) ((1) CENTRA - IST, (2) UC Irvine)
14 pages and 15 figures
While limited to low spatial resolution, the next generation low-frequency
radio interferometers that target 21 cm observations during the era of
reionization and prior will have instantaneous fields-of-view that are many
tens of square degrees on the sky.
(more)
12 11 09 - 22:32 |
No comments
Tuesday, 10 November
Radiation thermo-chemical models of protoplanetary disks II. Line
diagnostics
http://www.arxiv.org/abs/0911.1949
I. Kamp,
I. Tilling,
P. Woitke,
W.-F. Thi,
M. Hogerheijde
accepted for publication in A&A
Methods.
(more)
10 11 09 - 22:21 |
No comments
Solar-Terrestrial Simulations of CMEs with a Realistic Initiation
Mechanism: Case Study for Active Region 10069
http://www.arxiv.org/abs/0911.1895
N. Lugaz,
I. I. Roussev,
I. V. Sokolov,
C. Jacobs
4 pages, 2 figures, refereed proceedings for Solar Wind 12
Most simulations of coronal mass ejections (CMEs) to date either focus on the
interplanetary propagation of a giant plasma "blob" without paying too much
attention to its origin and to the formation process or they focus on the
complex evolution of the coronal magnetic field due to (sub-)photospheric
motions which result in an eruption.
(more)
10 11 09 - 22:20 |
No comments
Exploring the $P_{cyc}$ vs $P_{rot}$ relation with flux transport dynamo
models of solar-like stars
http://www.arxiv.org/abs/0911.1947
L. Jouve (1,2),
B.P. Brown (3),
A.S. Brun (1,3)
12 pages, 8 figures, accepted for publication by A&A 1: AIM, CEA/DSM-CNRS-Univ. Paris 7, IRFU/SAp, France, 2: D.A.M.T.P., Centre for Mathematical Sciences, Univ. of Cambridge, UK, 3: JILA and Department of Astrophysical and Planetary Sciences, Univ. of Colorado, USA
Aims: To understand stellar magnetism and to test the validity of the
Babcock-Leighton flux transport mean field dynamo models with stellar activity
observations Methods: 2-D mean field dynamo models at various rotation rates
are computed with the STELEM code to study the sensitivity of the activity
cycle period and butterfly diagram to parameter changes and are compared to
observational data.
(more)
10 11 09 - 22:20 |
No comments
Virtual Observatory: Science capabilities and scientific results
http://www.arxiv.org/abs/0911.1878
Evanthia Hatziminaoglou (ESO, Garching)
10 pages, 5 figures, invited talk, proceedings of the 9th Hellenic Astronomical Society Conference, Athens, 20-24 September 2009
The virtual observatory (VO) is a collection of interoperable data archives,
tools and applications that together form an environment in which original
astronomical research can be carried out.
(more)
10 11 09 - 22:19 |
No comments
Revisiting 2D Numerical Models for the 19th century outbursts of $\eta$
Carinae
http://www.arxiv.org/abs/0911.1808
R.F. González,
A.M. Villa,
G.C. Gómez,
E.M. de Gouveia Dal Pino,
A.C. Raga,
J. Cantó,
P.F. Velázquez,
E. de la Fuente
accepted for publication in MNRAS
We present here new results of two-dimensional hydrodynamical simulations of
the eruptive events of the 1840s (the great) and the 1890s (the minor)
eruptions suffered by the massive star $\eta$ Car.
(more)
10 11 09 - 22:19 |
No comments
Structure, Kinematics, and Chemical Enrichment Patterns after Major
Gas-Rich Disc-Disc Mergers
http://www.arxiv.org/abs/0911.1801
Simon Richard,
Chris B. Brook,
Hugo Martel,
Daisuke Kawata,
Brad K. Gibson,
Patricia Sanchez-Blazquez
17 pages, 20 figures, to be published in MNRAS
We used an N-body smoothed particle hydrodynamics algorithm, with a detailed
treatment of star formation, supernovae feedback, and chemical enrichment, to
perform eight simulations of mergers between gas-rich disc galaxies.
(more)
10 11 09 - 22:18 |
No comments
Dependence of the Star Formation Efficiency on the Parameters of
Molecular Cloud Formation Simulations
http://www.arxiv.org/abs/0911.1795
Yetli Rosas-Guevara,
Enrique Vazquez-Semadeni,
Gilberto C. Gomez,
A.-Katharina Jappsen
19 pages, submitted to MNRAS
We investigate the response of the star formation efficiency (SFE) to the
main parameters of simulations of molecular cloud formation by the collision of
warm diffuse medium (WNM) cylindrical streams, neglecting stellar feedback and
magnetic fields.
(more)
10 11 09 - 22:17 |
No comments
Chemical Evolution in Hierarchical Models of Cosmic Structure II: The
Formation of the Milky Way Stellar Halo and the Distribution of the Oldest
Stars
http://www.arxiv.org/abs/0911.1786
Jason Tumlinson (STScI)
Submitted to ApJ, 22 pages emulateapj, 15 color figures
This paper presents theoretical star formation and chemical enrichment
histories for the stellar halo of the Milky Way based on new chemodynamical
modeling.
(more)
10 11 09 - 22:15 |
No comments
Computing the Bayesian Evidence from a Markov Chain Monte Carlo
Simulation of the Posterior Distribution
http://www.arxiv.org/abs/0911.1777
Martin D. Weinberg
22 pages, 6 figures, submitted to Bayesian Analysis
Computation of the marginal likelihood or "Bayesian Evidence" from a
simulated posterior distribution is central to Bayesian model selection but is
fraught with difficulty.
(more)
10 11 09 - 22:15 |
No comments
Monday, 09 November
A Simultaneous Stacking and Deblending Algorithm for Astronomical Images
http://www.arxiv.org/abs/0911.1592
Peter Kurczynski,
Eric Gawiser
submitted to The Astronomical Journal. 18 pages, 6 figures
Stacking analysis is a means of detecting faint sources using a priori
position information to estimate an aggregate signal from individually
undetected objects.
(more)
09 11 09 - 23:39 |
No comments
A turbulence model for smoothed particle hydrodynamics
http://www.arxiv.org/abs/0911.2523J. J. Monaghan
34 pages, 11 figures
The aim of this paper is to devise a turbulence model for the particle method Smoothed Particle Hydrodynamics (SPH) which makes few assumptions, conserves linear and angular momentum, satisfies a discrete version of Kelvin's circulation theorem, and is computationally efficient.
(more)
16 11 09 - 13:17 |
No comments
Sunday, 15 November
The case for AGN feedback in galaxy groups
http://www.arxiv.org/abs/0911.2641
Ian G. McCarthy,
Joop Schaye,
Trevor J. Ponman,
Richard G. Bower,
Craig M. Booth,
Claudio Dalla Vecchia,
Robert A. Crain,
Volker Springel,
Tom Theuns,
Robert P. C. Wiersma
20 pages, 13 figures, submitted to MNRAS
[Abridged] The relatively recent insight that energy input from supermassive
black holes (BHs) can have a substantial effect on the star formation rates
(SFRs) of galaxies motivates us to examine its effects on the scale of galaxy
groups.
(more)
15 11 09 - 21:15 |
No comments
Spectro-Perfectionism: An Algorithmic Framework for Photon Noise-Limited
Extraction of Optical Fiber Spectroscopy
http://www.arxiv.org/abs/0911.2689
Adam S. Bolton (Utah),
David J. Schlegel (LBL)
8 pages, 4 figures, emulateapj; submitted to PASP; comments welcome
We describe a new algorithm for the "perfect" extraction of one-dimensional
spectra from two-dimensional CCD images of optical fiber spectrographs, based
on accurate two-dimensional (2D) forward modeling of the raw pixel data.
(more)
15 11 09 - 21:15 |
No comments
Turbulence modeling and the physics of the intra-cluster medium
http://www.arxiv.org/abs/0911.2629
L. Iapichino (1),
A. Maier (2),
W. Schmidt (3),
J. C. Niemeyer (3) ((1) ZAH/ITA, Univ. Heidelberg; (2) Lehrstuhl für Astronomie, Univ. Würzburg; (3) Institut für Astrophysik, Univ. Göttingen)
To appear in the proceedings of the "Invisible Universe International Conference"
FEARLESS (Fluid mEchanics with Adaptively Refined Large Eddy SimulationS) is
a new numerical scheme arising from the combined use of subgrid scale (SGS)
model for turbulence at the unresolved length scales and adaptive mesh
refinement (AMR) for resolving the large scales.
(more)
15 11 09 - 21:14 |
No comments
Discarded low energy particles in extensive air shower simulations:
Effect on the shower Energy Deposit
http://www.arxiv.org/abs/0911.2535
M. J. Tueros
15 pages, 7 figures, submited to Journal of physics G
The simulation of particle cascades initiated in the atmosphere by ultra high
energy cosmic ray particles involves the generation and propagation of a huge
amount of particles.
(more)
15 11 09 - 21:13 |
No comments
Detecting the orientation of magnetic fields in galaxy clusters
http://www.arxiv.org/abs/0911.2476
Christoph Pfrommer (1),
L. Jonathan Dursi (2, 1), ((1) CITA, (2) SciNet)
this http URL
Clusters of galaxies, filled with hot, magnetised plasma, are the largest
bound objects in existence and an important touchstone in understanding the
formation of structures in our Universe.
(more)
15 11 09 - 21:00 |
No comments
Detecting the orientation of magnetic fields in galaxy clusters
http://www.arxiv.org/abs/0911.2476
Christoph Pfrommer (1),
L. Jonathan Dursi (2, 1), ((1) CITA, (2) SciNet)
this http URL
Clusters of galaxies, filled with hot, magnetised plasma, are the largest
bound objects in existence and an important touchstone in understanding the
formation of structures in our Universe.
(more)
15 11 09 - 20:57 |
No comments
Detecting the orientation of magnetic fields in galaxy clusters
http://www.arxiv.org/abs/0911.2476
Christoph Pfrommer (1),
L. Jonathan Dursi (2, 1), ((1) CITA, (2) SciNet)
this http URL
Clusters of galaxies, filled with hot, magnetised plasma, are the largest
bound objects in existence and an important touchstone in understanding the
formation of structures in our Universe.
(more)
15 11 09 - 20:44 |
No comments
Interactions between a massive planet and a disc
http://www.arxiv.org/abs/0911.2468
Pau Amaro-Seoane,
Ignasi Ribas,
Ulf Loeckmann,
Holger Baumgardt
Two-page contribution to "Pathways towards habitable planets". An extended version of this note will be soon published in ApJ (needs asp2006.sty, psfig.sty and picins.sty, included)
We analyse the potential migration of massive planets forming far away from
an inner planetary system.
(more)
15 11 09 - 20:43 |
No comments
Thursday, 12 November
Simulations of momentum feedback by black hole winds
http://www.arxiv.org/abs/0911.2434
Sergei Nayakshin,
Chris Power (Leicester)
17 pages, to appear in MNRAS
The observed super-massive black hole (SMBH) mass -- galaxy velocity
dispersion ($M_{\rm bh} - \sigma$) correlation may be established when
winds/outflows from the SMBH drive gas out of the potential wells of classical
bulges.
(more)
12 11 09 - 22:40 |
No comments
Scaled solar tracks and isochrones in a large region of the Z-Y plane.
II. From 2.5 to 20 solar masses
http://www.arxiv.org/abs/0911.2419
G. Bertelli (1),
E. Nasi (1),
L. Girardi (1),
P. Marigo (2) ((1) INAF - Padova Astronomical Observatory, (2) Astronomical Department, Padova University)
17 pages, 18 figures, accepted for publication in A&A
We extend our theoretical computations for low-mass stars to
intermediate-mass and massive stars, for which few databases exist in the
literature.
(more)
12 11 09 - 22:39 |
No comments
Gas Accretion from a Circumbinary Disk
http://www.arxiv.org/abs/0911.2032
Tomoyuki Hanawa,
Yasuhiro Ochi,
Koichi Ando
41 pages, 25 PostScript figures, uses AASTeX, to appear in ApJ
A new computational scheme is developed to study gas accretion from a
circumbinary disk.
(more)
12 11 09 - 22:35 |
No comments
Fast and Large Volume Simulations of the 21 cm Signal from the
Reionization and pre-Reionization Epochs
http://www.arxiv.org/abs/0911.2219
M. G. Santos (1),
L. Ferramacho (1),
M. B. Silva (1),
A. Amblard (2),
A. Cooray (2) ((1) CENTRA - IST, (2) UC Irvine)
14 pages and 15 figures
While limited to low spatial resolution, the next generation low-frequency
radio interferometers that target 21 cm observations during the era of
reionization and prior will have instantaneous fields-of-view that are many
tens of square degrees on the sky.
(more)
12 11 09 - 22:32 |
No comments
Tuesday, 10 November
Radiation thermo-chemical models of protoplanetary disks II. Line
diagnostics
http://www.arxiv.org/abs/0911.1949
I. Kamp,
I. Tilling,
P. Woitke,
W.-F. Thi,
M. Hogerheijde
accepted for publication in A&A
Methods.
(more)
10 11 09 - 22:21 |
No comments
Solar-Terrestrial Simulations of CMEs with a Realistic Initiation
Mechanism: Case Study for Active Region 10069
http://www.arxiv.org/abs/0911.1895
N. Lugaz,
I. I. Roussev,
I. V. Sokolov,
C. Jacobs
4 pages, 2 figures, refereed proceedings for Solar Wind 12
Most simulations of coronal mass ejections (CMEs) to date either focus on the
interplanetary propagation of a giant plasma "blob" without paying too much
attention to its origin and to the formation process or they focus on the
complex evolution of the coronal magnetic field due to (sub-)photospheric
motions which result in an eruption.
(more)
10 11 09 - 22:20 |
No comments
Exploring the $P_{cyc}$ vs $P_{rot}$ relation with flux transport dynamo
models of solar-like stars
http://www.arxiv.org/abs/0911.1947
L. Jouve (1,2),
B.P. Brown (3),
A.S. Brun (1,3)
12 pages, 8 figures, accepted for publication by A&A 1: AIM, CEA/DSM-CNRS-Univ. Paris 7, IRFU/SAp, France, 2: D.A.M.T.P., Centre for Mathematical Sciences, Univ. of Cambridge, UK, 3: JILA and Department of Astrophysical and Planetary Sciences, Univ. of Colorado, USA
Aims: To understand stellar magnetism and to test the validity of the
Babcock-Leighton flux transport mean field dynamo models with stellar activity
observations Methods: 2-D mean field dynamo models at various rotation rates
are computed with the STELEM code to study the sensitivity of the activity
cycle period and butterfly diagram to parameter changes and are compared to
observational data.
(more)
10 11 09 - 22:20 |
No comments
Virtual Observatory: Science capabilities and scientific results
http://www.arxiv.org/abs/0911.1878
Evanthia Hatziminaoglou (ESO, Garching)
10 pages, 5 figures, invited talk, proceedings of the 9th Hellenic Astronomical Society Conference, Athens, 20-24 September 2009
The virtual observatory (VO) is a collection of interoperable data archives,
tools and applications that together form an environment in which original
astronomical research can be carried out.
(more)
10 11 09 - 22:19 |
No comments
Revisiting 2D Numerical Models for the 19th century outbursts of $\eta$
Carinae
http://www.arxiv.org/abs/0911.1808
R.F. González,
A.M. Villa,
G.C. Gómez,
E.M. de Gouveia Dal Pino,
A.C. Raga,
J. Cantó,
P.F. Velázquez,
E. de la Fuente
accepted for publication in MNRAS
We present here new results of two-dimensional hydrodynamical simulations of
the eruptive events of the 1840s (the great) and the 1890s (the minor)
eruptions suffered by the massive star $\eta$ Car.
(more)
10 11 09 - 22:19 |
No comments
Structure, Kinematics, and Chemical Enrichment Patterns after Major
Gas-Rich Disc-Disc Mergers
http://www.arxiv.org/abs/0911.1801
Simon Richard,
Chris B. Brook,
Hugo Martel,
Daisuke Kawata,
Brad K. Gibson,
Patricia Sanchez-Blazquez
17 pages, 20 figures, to be published in MNRAS
We used an N-body smoothed particle hydrodynamics algorithm, with a detailed
treatment of star formation, supernovae feedback, and chemical enrichment, to
perform eight simulations of mergers between gas-rich disc galaxies.
(more)
10 11 09 - 22:18 |
No comments
Dependence of the Star Formation Efficiency on the Parameters of
Molecular Cloud Formation Simulations
http://www.arxiv.org/abs/0911.1795
Yetli Rosas-Guevara,
Enrique Vazquez-Semadeni,
Gilberto C. Gomez,
A.-Katharina Jappsen
19 pages, submitted to MNRAS
We investigate the response of the star formation efficiency (SFE) to the
main parameters of simulations of molecular cloud formation by the collision of
warm diffuse medium (WNM) cylindrical streams, neglecting stellar feedback and
magnetic fields.
(more)
10 11 09 - 22:17 |
No comments
Chemical Evolution in Hierarchical Models of Cosmic Structure II: The
Formation of the Milky Way Stellar Halo and the Distribution of the Oldest
Stars
http://www.arxiv.org/abs/0911.1786
Jason Tumlinson (STScI)
Submitted to ApJ, 22 pages emulateapj, 15 color figures
This paper presents theoretical star formation and chemical enrichment
histories for the stellar halo of the Milky Way based on new chemodynamical
modeling.
(more)
10 11 09 - 22:15 |
No comments
Computing the Bayesian Evidence from a Markov Chain Monte Carlo
Simulation of the Posterior Distribution
http://www.arxiv.org/abs/0911.1777
Martin D. Weinberg
22 pages, 6 figures, submitted to Bayesian Analysis
Computation of the marginal likelihood or "Bayesian Evidence" from a
simulated posterior distribution is central to Bayesian model selection but is
fraught with difficulty.
(more)
10 11 09 - 22:15 |
No comments
Monday, 09 November
A Simultaneous Stacking and Deblending Algorithm for Astronomical Images
http://www.arxiv.org/abs/0911.1592
Peter Kurczynski,
Eric Gawiser
submitted to The Astronomical Journal. 18 pages, 6 figures
Stacking analysis is a means of detecting faint sources using a priori
position information to estimate an aggregate signal from individually
undetected objects.
(more)
09 11 09 - 23:39 |
No comments
The case for AGN feedback in galaxy groups
http://www.arxiv.org/abs/0911.2641Ian G. McCarthy, Joop Schaye, Trevor J. Ponman, Richard G. Bower, Craig M. Booth, Claudio Dalla Vecchia, Robert A. Crain, Volker Springel, Tom Theuns, Robert P. C. Wiersma
20 pages, 13 figures, submitted to MNRAS
[Abridged] The relatively recent insight that energy input from supermassive black holes (BHs) can have a substantial effect on the star formation rates (SFRs) of galaxies motivates us to examine its effects on the scale of galaxy groups.
(more)
15 11 09 - 21:15 |
No comments
Spectro-Perfectionism: An Algorithmic Framework for Photon Noise-Limited
Extraction of Optical Fiber Spectroscopy
http://www.arxiv.org/abs/0911.2689
Adam S. Bolton (Utah),
David J. Schlegel (LBL)
8 pages, 4 figures, emulateapj; submitted to PASP; comments welcome
We describe a new algorithm for the "perfect" extraction of one-dimensional
spectra from two-dimensional CCD images of optical fiber spectrographs, based
on accurate two-dimensional (2D) forward modeling of the raw pixel data.
(more)
15 11 09 - 21:15 |
No comments
Turbulence modeling and the physics of the intra-cluster medium
http://www.arxiv.org/abs/0911.2629
L. Iapichino (1),
A. Maier (2),
W. Schmidt (3),
J. C. Niemeyer (3) ((1) ZAH/ITA, Univ. Heidelberg; (2) Lehrstuhl für Astronomie, Univ. Würzburg; (3) Institut für Astrophysik, Univ. Göttingen)
To appear in the proceedings of the "Invisible Universe International Conference"
FEARLESS (Fluid mEchanics with Adaptively Refined Large Eddy SimulationS) is
a new numerical scheme arising from the combined use of subgrid scale (SGS)
model for turbulence at the unresolved length scales and adaptive mesh
refinement (AMR) for resolving the large scales.
(more)
15 11 09 - 21:14 |
No comments
Discarded low energy particles in extensive air shower simulations:
Effect on the shower Energy Deposit
http://www.arxiv.org/abs/0911.2535
M. J. Tueros
15 pages, 7 figures, submited to Journal of physics G
The simulation of particle cascades initiated in the atmosphere by ultra high
energy cosmic ray particles involves the generation and propagation of a huge
amount of particles.
(more)
15 11 09 - 21:13 |
No comments
Detecting the orientation of magnetic fields in galaxy clusters
http://www.arxiv.org/abs/0911.2476
Christoph Pfrommer (1),
L. Jonathan Dursi (2, 1), ((1) CITA, (2) SciNet)
this http URL
Clusters of galaxies, filled with hot, magnetised plasma, are the largest
bound objects in existence and an important touchstone in understanding the
formation of structures in our Universe.
(more)
15 11 09 - 21:00 |
No comments
Detecting the orientation of magnetic fields in galaxy clusters
http://www.arxiv.org/abs/0911.2476
Christoph Pfrommer (1),
L. Jonathan Dursi (2, 1), ((1) CITA, (2) SciNet)
this http URL
Clusters of galaxies, filled with hot, magnetised plasma, are the largest
bound objects in existence and an important touchstone in understanding the
formation of structures in our Universe.
(more)
15 11 09 - 20:57 |
No comments
Detecting the orientation of magnetic fields in galaxy clusters
http://www.arxiv.org/abs/0911.2476
Christoph Pfrommer (1),
L. Jonathan Dursi (2, 1), ((1) CITA, (2) SciNet)
this http URL
Clusters of galaxies, filled with hot, magnetised plasma, are the largest
bound objects in existence and an important touchstone in understanding the
formation of structures in our Universe.
(more)
15 11 09 - 20:44 |
No comments
Interactions between a massive planet and a disc
http://www.arxiv.org/abs/0911.2468
Pau Amaro-Seoane,
Ignasi Ribas,
Ulf Loeckmann,
Holger Baumgardt
Two-page contribution to "Pathways towards habitable planets". An extended version of this note will be soon published in ApJ (needs asp2006.sty, psfig.sty and picins.sty, included)
We analyse the potential migration of massive planets forming far away from
an inner planetary system.
(more)
15 11 09 - 20:43 |
No comments
Thursday, 12 November
Simulations of momentum feedback by black hole winds
http://www.arxiv.org/abs/0911.2434
Sergei Nayakshin,
Chris Power (Leicester)
17 pages, to appear in MNRAS
The observed super-massive black hole (SMBH) mass -- galaxy velocity
dispersion ($M_{\rm bh} - \sigma$) correlation may be established when
winds/outflows from the SMBH drive gas out of the potential wells of classical
bulges.
(more)
12 11 09 - 22:40 |
No comments
Scaled solar tracks and isochrones in a large region of the Z-Y plane.
II. From 2.5 to 20 solar masses
http://www.arxiv.org/abs/0911.2419
G. Bertelli (1),
E. Nasi (1),
L. Girardi (1),
P. Marigo (2) ((1) INAF - Padova Astronomical Observatory, (2) Astronomical Department, Padova University)
17 pages, 18 figures, accepted for publication in A&A
We extend our theoretical computations for low-mass stars to
intermediate-mass and massive stars, for which few databases exist in the
literature.
(more)
12 11 09 - 22:39 |
No comments
Gas Accretion from a Circumbinary Disk
http://www.arxiv.org/abs/0911.2032
Tomoyuki Hanawa,
Yasuhiro Ochi,
Koichi Ando
41 pages, 25 PostScript figures, uses AASTeX, to appear in ApJ
A new computational scheme is developed to study gas accretion from a
circumbinary disk.
(more)
12 11 09 - 22:35 |
No comments
Fast and Large Volume Simulations of the 21 cm Signal from the
Reionization and pre-Reionization Epochs
http://www.arxiv.org/abs/0911.2219
M. G. Santos (1),
L. Ferramacho (1),
M. B. Silva (1),
A. Amblard (2),
A. Cooray (2) ((1) CENTRA - IST, (2) UC Irvine)
14 pages and 15 figures
While limited to low spatial resolution, the next generation low-frequency
radio interferometers that target 21 cm observations during the era of
reionization and prior will have instantaneous fields-of-view that are many
tens of square degrees on the sky.
(more)
12 11 09 - 22:32 |
No comments
Tuesday, 10 November
Radiation thermo-chemical models of protoplanetary disks II. Line
diagnostics
http://www.arxiv.org/abs/0911.1949
I. Kamp,
I. Tilling,
P. Woitke,
W.-F. Thi,
M. Hogerheijde
accepted for publication in A&A
Methods.
(more)
10 11 09 - 22:21 |
No comments
Solar-Terrestrial Simulations of CMEs with a Realistic Initiation
Mechanism: Case Study for Active Region 10069
http://www.arxiv.org/abs/0911.1895
N. Lugaz,
I. I. Roussev,
I. V. Sokolov,
C. Jacobs
4 pages, 2 figures, refereed proceedings for Solar Wind 12
Most simulations of coronal mass ejections (CMEs) to date either focus on the
interplanetary propagation of a giant plasma "blob" without paying too much
attention to its origin and to the formation process or they focus on the
complex evolution of the coronal magnetic field due to (sub-)photospheric
motions which result in an eruption.
(more)
10 11 09 - 22:20 |
No comments
Exploring the $P_{cyc}$ vs $P_{rot}$ relation with flux transport dynamo
models of solar-like stars
http://www.arxiv.org/abs/0911.1947
L. Jouve (1,2),
B.P. Brown (3),
A.S. Brun (1,3)
12 pages, 8 figures, accepted for publication by A&A 1: AIM, CEA/DSM-CNRS-Univ. Paris 7, IRFU/SAp, France, 2: D.A.M.T.P., Centre for Mathematical Sciences, Univ. of Cambridge, UK, 3: JILA and Department of Astrophysical and Planetary Sciences, Univ. of Colorado, USA
Aims: To understand stellar magnetism and to test the validity of the
Babcock-Leighton flux transport mean field dynamo models with stellar activity
observations Methods: 2-D mean field dynamo models at various rotation rates
are computed with the STELEM code to study the sensitivity of the activity
cycle period and butterfly diagram to parameter changes and are compared to
observational data.
(more)
10 11 09 - 22:20 |
No comments
Virtual Observatory: Science capabilities and scientific results
http://www.arxiv.org/abs/0911.1878
Evanthia Hatziminaoglou (ESO, Garching)
10 pages, 5 figures, invited talk, proceedings of the 9th Hellenic Astronomical Society Conference, Athens, 20-24 September 2009
The virtual observatory (VO) is a collection of interoperable data archives,
tools and applications that together form an environment in which original
astronomical research can be carried out.
(more)
10 11 09 - 22:19 |
No comments
Revisiting 2D Numerical Models for the 19th century outbursts of $\eta$
Carinae
http://www.arxiv.org/abs/0911.1808
R.F. González,
A.M. Villa,
G.C. Gómez,
E.M. de Gouveia Dal Pino,
A.C. Raga,
J. Cantó,
P.F. Velázquez,
E. de la Fuente
accepted for publication in MNRAS
We present here new results of two-dimensional hydrodynamical simulations of
the eruptive events of the 1840s (the great) and the 1890s (the minor)
eruptions suffered by the massive star $\eta$ Car.
(more)
10 11 09 - 22:19 |
No comments
Structure, Kinematics, and Chemical Enrichment Patterns after Major
Gas-Rich Disc-Disc Mergers
http://www.arxiv.org/abs/0911.1801
Simon Richard,
Chris B. Brook,
Hugo Martel,
Daisuke Kawata,
Brad K. Gibson,
Patricia Sanchez-Blazquez
17 pages, 20 figures, to be published in MNRAS
We used an N-body smoothed particle hydrodynamics algorithm, with a detailed
treatment of star formation, supernovae feedback, and chemical enrichment, to
perform eight simulations of mergers between gas-rich disc galaxies.
(more)
10 11 09 - 22:18 |
No comments
Dependence of the Star Formation Efficiency on the Parameters of
Molecular Cloud Formation Simulations
http://www.arxiv.org/abs/0911.1795
Yetli Rosas-Guevara,
Enrique Vazquez-Semadeni,
Gilberto C. Gomez,
A.-Katharina Jappsen
19 pages, submitted to MNRAS
We investigate the response of the star formation efficiency (SFE) to the
main parameters of simulations of molecular cloud formation by the collision of
warm diffuse medium (WNM) cylindrical streams, neglecting stellar feedback and
magnetic fields.
(more)
10 11 09 - 22:17 |
No comments
Chemical Evolution in Hierarchical Models of Cosmic Structure II: The
Formation of the Milky Way Stellar Halo and the Distribution of the Oldest
Stars
http://www.arxiv.org/abs/0911.1786
Jason Tumlinson (STScI)
Submitted to ApJ, 22 pages emulateapj, 15 color figures
This paper presents theoretical star formation and chemical enrichment
histories for the stellar halo of the Milky Way based on new chemodynamical
modeling.
(more)
10 11 09 - 22:15 |
No comments
Computing the Bayesian Evidence from a Markov Chain Monte Carlo
Simulation of the Posterior Distribution
http://www.arxiv.org/abs/0911.1777
Martin D. Weinberg
22 pages, 6 figures, submitted to Bayesian Analysis
Computation of the marginal likelihood or "Bayesian Evidence" from a
simulated posterior distribution is central to Bayesian model selection but is
fraught with difficulty.
(more)
10 11 09 - 22:15 |
No comments
Monday, 09 November
A Simultaneous Stacking and Deblending Algorithm for Astronomical Images
http://www.arxiv.org/abs/0911.1592
Peter Kurczynski,
Eric Gawiser
submitted to The Astronomical Journal. 18 pages, 6 figures
Stacking analysis is a means of detecting faint sources using a priori
position information to estimate an aggregate signal from individually
undetected objects.
(more)
09 11 09 - 23:39 |
No comments
Spectro-Perfectionism: An Algorithmic Framework for Photon Noise-Limited Extraction of Optical Fiber Spectroscopy
http://www.arxiv.org/abs/0911.2689Adam S. Bolton (Utah), David J. Schlegel (LBL)
8 pages, 4 figures, emulateapj; submitted to PASP; comments welcome
We describe a new algorithm for the "perfect" extraction of one-dimensional spectra from two-dimensional CCD images of optical fiber spectrographs, based on accurate two-dimensional (2D) forward modeling of the raw pixel data.
(more)
15 11 09 - 21:15 |
No comments
Turbulence modeling and the physics of the intra-cluster medium
http://www.arxiv.org/abs/0911.2629
L. Iapichino (1),
A. Maier (2),
W. Schmidt (3),
J. C. Niemeyer (3) ((1) ZAH/ITA, Univ. Heidelberg; (2) Lehrstuhl für Astronomie, Univ. Würzburg; (3) Institut für Astrophysik, Univ. Göttingen)
To appear in the proceedings of the "Invisible Universe International Conference"
FEARLESS (Fluid mEchanics with Adaptively Refined Large Eddy SimulationS) is
a new numerical scheme arising from the combined use of subgrid scale (SGS)
model for turbulence at the unresolved length scales and adaptive mesh
refinement (AMR) for resolving the large scales.
(more)
15 11 09 - 21:14 |
No comments
Discarded low energy particles in extensive air shower simulations:
Effect on the shower Energy Deposit
http://www.arxiv.org/abs/0911.2535
M. J. Tueros
15 pages, 7 figures, submited to Journal of physics G
The simulation of particle cascades initiated in the atmosphere by ultra high
energy cosmic ray particles involves the generation and propagation of a huge
amount of particles.
(more)
15 11 09 - 21:13 |
No comments
Detecting the orientation of magnetic fields in galaxy clusters
http://www.arxiv.org/abs/0911.2476
Christoph Pfrommer (1),
L. Jonathan Dursi (2, 1), ((1) CITA, (2) SciNet)
this http URL
Clusters of galaxies, filled with hot, magnetised plasma, are the largest
bound objects in existence and an important touchstone in understanding the
formation of structures in our Universe.
(more)
15 11 09 - 21:00 |
No comments
Detecting the orientation of magnetic fields in galaxy clusters
http://www.arxiv.org/abs/0911.2476
Christoph Pfrommer (1),
L. Jonathan Dursi (2, 1), ((1) CITA, (2) SciNet)
this http URL
Clusters of galaxies, filled with hot, magnetised plasma, are the largest
bound objects in existence and an important touchstone in understanding the
formation of structures in our Universe.
(more)
15 11 09 - 20:57 |
No comments
Detecting the orientation of magnetic fields in galaxy clusters
http://www.arxiv.org/abs/0911.2476
Christoph Pfrommer (1),
L. Jonathan Dursi (2, 1), ((1) CITA, (2) SciNet)
this http URL
Clusters of galaxies, filled with hot, magnetised plasma, are the largest
bound objects in existence and an important touchstone in understanding the
formation of structures in our Universe.
(more)
15 11 09 - 20:44 |
No comments
Interactions between a massive planet and a disc
http://www.arxiv.org/abs/0911.2468
Pau Amaro-Seoane,
Ignasi Ribas,
Ulf Loeckmann,
Holger Baumgardt
Two-page contribution to "Pathways towards habitable planets". An extended version of this note will be soon published in ApJ (needs asp2006.sty, psfig.sty and picins.sty, included)
We analyse the potential migration of massive planets forming far away from
an inner planetary system.
(more)
15 11 09 - 20:43 |
No comments
Thursday, 12 November
Simulations of momentum feedback by black hole winds
http://www.arxiv.org/abs/0911.2434
Sergei Nayakshin,
Chris Power (Leicester)
17 pages, to appear in MNRAS
The observed super-massive black hole (SMBH) mass -- galaxy velocity
dispersion ($M_{\rm bh} - \sigma$) correlation may be established when
winds/outflows from the SMBH drive gas out of the potential wells of classical
bulges.
(more)
12 11 09 - 22:40 |
No comments
Scaled solar tracks and isochrones in a large region of the Z-Y plane.
II. From 2.5 to 20 solar masses
http://www.arxiv.org/abs/0911.2419
G. Bertelli (1),
E. Nasi (1),
L. Girardi (1),
P. Marigo (2) ((1) INAF - Padova Astronomical Observatory, (2) Astronomical Department, Padova University)
17 pages, 18 figures, accepted for publication in A&A
We extend our theoretical computations for low-mass stars to
intermediate-mass and massive stars, for which few databases exist in the
literature.
(more)
12 11 09 - 22:39 |
No comments
Gas Accretion from a Circumbinary Disk
http://www.arxiv.org/abs/0911.2032
Tomoyuki Hanawa,
Yasuhiro Ochi,
Koichi Ando
41 pages, 25 PostScript figures, uses AASTeX, to appear in ApJ
A new computational scheme is developed to study gas accretion from a
circumbinary disk.
(more)
12 11 09 - 22:35 |
No comments
Fast and Large Volume Simulations of the 21 cm Signal from the
Reionization and pre-Reionization Epochs
http://www.arxiv.org/abs/0911.2219
M. G. Santos (1),
L. Ferramacho (1),
M. B. Silva (1),
A. Amblard (2),
A. Cooray (2) ((1) CENTRA - IST, (2) UC Irvine)
14 pages and 15 figures
While limited to low spatial resolution, the next generation low-frequency
radio interferometers that target 21 cm observations during the era of
reionization and prior will have instantaneous fields-of-view that are many
tens of square degrees on the sky.
(more)
12 11 09 - 22:32 |
No comments
Tuesday, 10 November
Radiation thermo-chemical models of protoplanetary disks II. Line
diagnostics
http://www.arxiv.org/abs/0911.1949
I. Kamp,
I. Tilling,
P. Woitke,
W.-F. Thi,
M. Hogerheijde
accepted for publication in A&A
Methods.
(more)
10 11 09 - 22:21 |
No comments
Solar-Terrestrial Simulations of CMEs with a Realistic Initiation
Mechanism: Case Study for Active Region 10069
http://www.arxiv.org/abs/0911.1895
N. Lugaz,
I. I. Roussev,
I. V. Sokolov,
C. Jacobs
4 pages, 2 figures, refereed proceedings for Solar Wind 12
Most simulations of coronal mass ejections (CMEs) to date either focus on the
interplanetary propagation of a giant plasma "blob" without paying too much
attention to its origin and to the formation process or they focus on the
complex evolution of the coronal magnetic field due to (sub-)photospheric
motions which result in an eruption.
(more)
10 11 09 - 22:20 |
No comments
Exploring the $P_{cyc}$ vs $P_{rot}$ relation with flux transport dynamo
models of solar-like stars
http://www.arxiv.org/abs/0911.1947
L. Jouve (1,2),
B.P. Brown (3),
A.S. Brun (1,3)
12 pages, 8 figures, accepted for publication by A&A 1: AIM, CEA/DSM-CNRS-Univ. Paris 7, IRFU/SAp, France, 2: D.A.M.T.P., Centre for Mathematical Sciences, Univ. of Cambridge, UK, 3: JILA and Department of Astrophysical and Planetary Sciences, Univ. of Colorado, USA
Aims: To understand stellar magnetism and to test the validity of the
Babcock-Leighton flux transport mean field dynamo models with stellar activity
observations Methods: 2-D mean field dynamo models at various rotation rates
are computed with the STELEM code to study the sensitivity of the activity
cycle period and butterfly diagram to parameter changes and are compared to
observational data.
(more)
10 11 09 - 22:20 |
No comments
Virtual Observatory: Science capabilities and scientific results
http://www.arxiv.org/abs/0911.1878
Evanthia Hatziminaoglou (ESO, Garching)
10 pages, 5 figures, invited talk, proceedings of the 9th Hellenic Astronomical Society Conference, Athens, 20-24 September 2009
The virtual observatory (VO) is a collection of interoperable data archives,
tools and applications that together form an environment in which original
astronomical research can be carried out.
(more)
10 11 09 - 22:19 |
No comments
Revisiting 2D Numerical Models for the 19th century outbursts of $\eta$
Carinae
http://www.arxiv.org/abs/0911.1808
R.F. González,
A.M. Villa,
G.C. Gómez,
E.M. de Gouveia Dal Pino,
A.C. Raga,
J. Cantó,
P.F. Velázquez,
E. de la Fuente
accepted for publication in MNRAS
We present here new results of two-dimensional hydrodynamical simulations of
the eruptive events of the 1840s (the great) and the 1890s (the minor)
eruptions suffered by the massive star $\eta$ Car.
(more)
10 11 09 - 22:19 |
No comments
Structure, Kinematics, and Chemical Enrichment Patterns after Major
Gas-Rich Disc-Disc Mergers
http://www.arxiv.org/abs/0911.1801
Simon Richard,
Chris B. Brook,
Hugo Martel,
Daisuke Kawata,
Brad K. Gibson,
Patricia Sanchez-Blazquez
17 pages, 20 figures, to be published in MNRAS
We used an N-body smoothed particle hydrodynamics algorithm, with a detailed
treatment of star formation, supernovae feedback, and chemical enrichment, to
perform eight simulations of mergers between gas-rich disc galaxies.
(more)
10 11 09 - 22:18 |
No comments
Dependence of the Star Formation Efficiency on the Parameters of
Molecular Cloud Formation Simulations
http://www.arxiv.org/abs/0911.1795
Yetli Rosas-Guevara,
Enrique Vazquez-Semadeni,
Gilberto C. Gomez,
A.-Katharina Jappsen
19 pages, submitted to MNRAS
We investigate the response of the star formation efficiency (SFE) to the
main parameters of simulations of molecular cloud formation by the collision of
warm diffuse medium (WNM) cylindrical streams, neglecting stellar feedback and
magnetic fields.
(more)
10 11 09 - 22:17 |
No comments
Chemical Evolution in Hierarchical Models of Cosmic Structure II: The
Formation of the Milky Way Stellar Halo and the Distribution of the Oldest
Stars
http://www.arxiv.org/abs/0911.1786
Jason Tumlinson (STScI)
Submitted to ApJ, 22 pages emulateapj, 15 color figures
This paper presents theoretical star formation and chemical enrichment
histories for the stellar halo of the Milky Way based on new chemodynamical
modeling.
(more)
10 11 09 - 22:15 |
No comments
Computing the Bayesian Evidence from a Markov Chain Monte Carlo
Simulation of the Posterior Distribution
http://www.arxiv.org/abs/0911.1777
Martin D. Weinberg
22 pages, 6 figures, submitted to Bayesian Analysis
Computation of the marginal likelihood or "Bayesian Evidence" from a
simulated posterior distribution is central to Bayesian model selection but is
fraught with difficulty.
(more)
10 11 09 - 22:15 |
No comments
Monday, 09 November
A Simultaneous Stacking and Deblending Algorithm for Astronomical Images
http://www.arxiv.org/abs/0911.1592
Peter Kurczynski,
Eric Gawiser
submitted to The Astronomical Journal. 18 pages, 6 figures
Stacking analysis is a means of detecting faint sources using a priori
position information to estimate an aggregate signal from individually
undetected objects.
(more)
09 11 09 - 23:39 |
No comments
Turbulence modeling and the physics of the intra-cluster medium
http://www.arxiv.org/abs/0911.2629L. Iapichino (1), A. Maier (2), W. Schmidt (3), J. C. Niemeyer (3) ((1) ZAH/ITA, Univ. Heidelberg; (2) Lehrstuhl für Astronomie, Univ. Würzburg; (3) Institut für Astrophysik, Univ. Göttingen)
To appear in the proceedings of the "Invisible Universe International Conference"
FEARLESS (Fluid mEchanics with Adaptively Refined Large Eddy SimulationS) is a new numerical scheme arising from the combined use of subgrid scale (SGS) model for turbulence at the unresolved length scales and adaptive mesh refinement (AMR) for resolving the large scales.
(more)
15 11 09 - 21:14 |
No comments
Discarded low energy particles in extensive air shower simulations:
Effect on the shower Energy Deposit
http://www.arxiv.org/abs/0911.2535
M. J. Tueros
15 pages, 7 figures, submited to Journal of physics G
The simulation of particle cascades initiated in the atmosphere by ultra high
energy cosmic ray particles involves the generation and propagation of a huge
amount of particles.
(more)
15 11 09 - 21:13 |
No comments
Detecting the orientation of magnetic fields in galaxy clusters
http://www.arxiv.org/abs/0911.2476
Christoph Pfrommer (1),
L. Jonathan Dursi (2, 1), ((1) CITA, (2) SciNet)
this http URL
Clusters of galaxies, filled with hot, magnetised plasma, are the largest
bound objects in existence and an important touchstone in understanding the
formation of structures in our Universe.
(more)
15 11 09 - 21:00 |
No comments
Detecting the orientation of magnetic fields in galaxy clusters
http://www.arxiv.org/abs/0911.2476
Christoph Pfrommer (1),
L. Jonathan Dursi (2, 1), ((1) CITA, (2) SciNet)
this http URL
Clusters of galaxies, filled with hot, magnetised plasma, are the largest
bound objects in existence and an important touchstone in understanding the
formation of structures in our Universe.
(more)
15 11 09 - 20:57 |
No comments
Detecting the orientation of magnetic fields in galaxy clusters
http://www.arxiv.org/abs/0911.2476
Christoph Pfrommer (1),
L. Jonathan Dursi (2, 1), ((1) CITA, (2) SciNet)
this http URL
Clusters of galaxies, filled with hot, magnetised plasma, are the largest
bound objects in existence and an important touchstone in understanding the
formation of structures in our Universe.
(more)
15 11 09 - 20:44 |
No comments
Interactions between a massive planet and a disc
http://www.arxiv.org/abs/0911.2468
Pau Amaro-Seoane,
Ignasi Ribas,
Ulf Loeckmann,
Holger Baumgardt
Two-page contribution to "Pathways towards habitable planets". An extended version of this note will be soon published in ApJ (needs asp2006.sty, psfig.sty and picins.sty, included)
We analyse the potential migration of massive planets forming far away from
an inner planetary system.
(more)
15 11 09 - 20:43 |
No comments
Thursday, 12 November
Simulations of momentum feedback by black hole winds
http://www.arxiv.org/abs/0911.2434
Sergei Nayakshin,
Chris Power (Leicester)
17 pages, to appear in MNRAS
The observed super-massive black hole (SMBH) mass -- galaxy velocity
dispersion ($M_{\rm bh} - \sigma$) correlation may be established when
winds/outflows from the SMBH drive gas out of the potential wells of classical
bulges.
(more)
12 11 09 - 22:40 |
No comments
Scaled solar tracks and isochrones in a large region of the Z-Y plane.
II. From 2.5 to 20 solar masses
http://www.arxiv.org/abs/0911.2419
G. Bertelli (1),
E. Nasi (1),
L. Girardi (1),
P. Marigo (2) ((1) INAF - Padova Astronomical Observatory, (2) Astronomical Department, Padova University)
17 pages, 18 figures, accepted for publication in A&A
We extend our theoretical computations for low-mass stars to
intermediate-mass and massive stars, for which few databases exist in the
literature.
(more)
12 11 09 - 22:39 |
No comments
Gas Accretion from a Circumbinary Disk
http://www.arxiv.org/abs/0911.2032
Tomoyuki Hanawa,
Yasuhiro Ochi,
Koichi Ando
41 pages, 25 PostScript figures, uses AASTeX, to appear in ApJ
A new computational scheme is developed to study gas accretion from a
circumbinary disk.
(more)
12 11 09 - 22:35 |
No comments
Fast and Large Volume Simulations of the 21 cm Signal from the
Reionization and pre-Reionization Epochs
http://www.arxiv.org/abs/0911.2219
M. G. Santos (1),
L. Ferramacho (1),
M. B. Silva (1),
A. Amblard (2),
A. Cooray (2) ((1) CENTRA - IST, (2) UC Irvine)
14 pages and 15 figures
While limited to low spatial resolution, the next generation low-frequency
radio interferometers that target 21 cm observations during the era of
reionization and prior will have instantaneous fields-of-view that are many
tens of square degrees on the sky.
(more)
12 11 09 - 22:32 |
No comments
Tuesday, 10 November
Radiation thermo-chemical models of protoplanetary disks II. Line
diagnostics
http://www.arxiv.org/abs/0911.1949
I. Kamp,
I. Tilling,
P. Woitke,
W.-F. Thi,
M. Hogerheijde
accepted for publication in A&A
Methods.
(more)
10 11 09 - 22:21 |
No comments
Solar-Terrestrial Simulations of CMEs with a Realistic Initiation
Mechanism: Case Study for Active Region 10069
http://www.arxiv.org/abs/0911.1895
N. Lugaz,
I. I. Roussev,
I. V. Sokolov,
C. Jacobs
4 pages, 2 figures, refereed proceedings for Solar Wind 12
Most simulations of coronal mass ejections (CMEs) to date either focus on the
interplanetary propagation of a giant plasma "blob" without paying too much
attention to its origin and to the formation process or they focus on the
complex evolution of the coronal magnetic field due to (sub-)photospheric
motions which result in an eruption.
(more)
10 11 09 - 22:20 |
No comments
Exploring the $P_{cyc}$ vs $P_{rot}$ relation with flux transport dynamo
models of solar-like stars
http://www.arxiv.org/abs/0911.1947
L. Jouve (1,2),
B.P. Brown (3),
A.S. Brun (1,3)
12 pages, 8 figures, accepted for publication by A&A 1: AIM, CEA/DSM-CNRS-Univ. Paris 7, IRFU/SAp, France, 2: D.A.M.T.P., Centre for Mathematical Sciences, Univ. of Cambridge, UK, 3: JILA and Department of Astrophysical and Planetary Sciences, Univ. of Colorado, USA
Aims: To understand stellar magnetism and to test the validity of the
Babcock-Leighton flux transport mean field dynamo models with stellar activity
observations Methods: 2-D mean field dynamo models at various rotation rates
are computed with the STELEM code to study the sensitivity of the activity
cycle period and butterfly diagram to parameter changes and are compared to
observational data.
(more)
10 11 09 - 22:20 |
No comments
Virtual Observatory: Science capabilities and scientific results
http://www.arxiv.org/abs/0911.1878
Evanthia Hatziminaoglou (ESO, Garching)
10 pages, 5 figures, invited talk, proceedings of the 9th Hellenic Astronomical Society Conference, Athens, 20-24 September 2009
The virtual observatory (VO) is a collection of interoperable data archives,
tools and applications that together form an environment in which original
astronomical research can be carried out.
(more)
10 11 09 - 22:19 |
No comments
Revisiting 2D Numerical Models for the 19th century outbursts of $\eta$
Carinae
http://www.arxiv.org/abs/0911.1808
R.F. González,
A.M. Villa,
G.C. Gómez,
E.M. de Gouveia Dal Pino,
A.C. Raga,
J. Cantó,
P.F. Velázquez,
E. de la Fuente
accepted for publication in MNRAS
We present here new results of two-dimensional hydrodynamical simulations of
the eruptive events of the 1840s (the great) and the 1890s (the minor)
eruptions suffered by the massive star $\eta$ Car.
(more)
10 11 09 - 22:19 |
No comments
Structure, Kinematics, and Chemical Enrichment Patterns after Major
Gas-Rich Disc-Disc Mergers
http://www.arxiv.org/abs/0911.1801
Simon Richard,
Chris B. Brook,
Hugo Martel,
Daisuke Kawata,
Brad K. Gibson,
Patricia Sanchez-Blazquez
17 pages, 20 figures, to be published in MNRAS
We used an N-body smoothed particle hydrodynamics algorithm, with a detailed
treatment of star formation, supernovae feedback, and chemical enrichment, to
perform eight simulations of mergers between gas-rich disc galaxies.
(more)
10 11 09 - 22:18 |
No comments
Dependence of the Star Formation Efficiency on the Parameters of
Molecular Cloud Formation Simulations
http://www.arxiv.org/abs/0911.1795
Yetli Rosas-Guevara,
Enrique Vazquez-Semadeni,
Gilberto C. Gomez,
A.-Katharina Jappsen
19 pages, submitted to MNRAS
We investigate the response of the star formation efficiency (SFE) to the
main parameters of simulations of molecular cloud formation by the collision of
warm diffuse medium (WNM) cylindrical streams, neglecting stellar feedback and
magnetic fields.
(more)
10 11 09 - 22:17 |
No comments
Chemical Evolution in Hierarchical Models of Cosmic Structure II: The
Formation of the Milky Way Stellar Halo and the Distribution of the Oldest
Stars
http://www.arxiv.org/abs/0911.1786
Jason Tumlinson (STScI)
Submitted to ApJ, 22 pages emulateapj, 15 color figures
This paper presents theoretical star formation and chemical enrichment
histories for the stellar halo of the Milky Way based on new chemodynamical
modeling.
(more)
10 11 09 - 22:15 |
No comments
Computing the Bayesian Evidence from a Markov Chain Monte Carlo
Simulation of the Posterior Distribution
http://www.arxiv.org/abs/0911.1777
Martin D. Weinberg
22 pages, 6 figures, submitted to Bayesian Analysis
Computation of the marginal likelihood or "Bayesian Evidence" from a
simulated posterior distribution is central to Bayesian model selection but is
fraught with difficulty.
(more)
10 11 09 - 22:15 |
No comments
Monday, 09 November
A Simultaneous Stacking and Deblending Algorithm for Astronomical Images
http://www.arxiv.org/abs/0911.1592
Peter Kurczynski,
Eric Gawiser
submitted to The Astronomical Journal. 18 pages, 6 figures
Stacking analysis is a means of detecting faint sources using a priori
position information to estimate an aggregate signal from individually
undetected objects.
(more)
09 11 09 - 23:39 |
No comments
Discarded low energy particles in extensive air shower simulations: Effect on the shower Energy Deposit
http://www.arxiv.org/abs/0911.2535M. J. Tueros
15 pages, 7 figures, submited to Journal of physics G
The simulation of particle cascades initiated in the atmosphere by ultra high energy cosmic ray particles involves the generation and propagation of a huge amount of particles.
(more)
15 11 09 - 21:13 |
No comments
Detecting the orientation of magnetic fields in galaxy clusters
http://www.arxiv.org/abs/0911.2476
Christoph Pfrommer (1),
L. Jonathan Dursi (2, 1), ((1) CITA, (2) SciNet)
this http URL
Clusters of galaxies, filled with hot, magnetised plasma, are the largest
bound objects in existence and an important touchstone in understanding the
formation of structures in our Universe.
(more)
15 11 09 - 21:00 |
No comments
Detecting the orientation of magnetic fields in galaxy clusters
http://www.arxiv.org/abs/0911.2476
Christoph Pfrommer (1),
L. Jonathan Dursi (2, 1), ((1) CITA, (2) SciNet)
this http URL
Clusters of galaxies, filled with hot, magnetised plasma, are the largest
bound objects in existence and an important touchstone in understanding the
formation of structures in our Universe.
(more)
15 11 09 - 20:57 |
No comments
Detecting the orientation of magnetic fields in galaxy clusters
http://www.arxiv.org/abs/0911.2476
Christoph Pfrommer (1),
L. Jonathan Dursi (2, 1), ((1) CITA, (2) SciNet)
this http URL
Clusters of galaxies, filled with hot, magnetised plasma, are the largest
bound objects in existence and an important touchstone in understanding the
formation of structures in our Universe.
(more)
15 11 09 - 20:44 |
No comments
Interactions between a massive planet and a disc
http://www.arxiv.org/abs/0911.2468
Pau Amaro-Seoane,
Ignasi Ribas,
Ulf Loeckmann,
Holger Baumgardt
Two-page contribution to "Pathways towards habitable planets". An extended version of this note will be soon published in ApJ (needs asp2006.sty, psfig.sty and picins.sty, included)
We analyse the potential migration of massive planets forming far away from
an inner planetary system.
(more)
15 11 09 - 20:43 |
No comments
Thursday, 12 November
Simulations of momentum feedback by black hole winds
http://www.arxiv.org/abs/0911.2434
Sergei Nayakshin,
Chris Power (Leicester)
17 pages, to appear in MNRAS
The observed super-massive black hole (SMBH) mass -- galaxy velocity
dispersion ($M_{\rm bh} - \sigma$) correlation may be established when
winds/outflows from the SMBH drive gas out of the potential wells of classical
bulges.
(more)
12 11 09 - 22:40 |
No comments
Scaled solar tracks and isochrones in a large region of the Z-Y plane.
II. From 2.5 to 20 solar masses
http://www.arxiv.org/abs/0911.2419
G. Bertelli (1),
E. Nasi (1),
L. Girardi (1),
P. Marigo (2) ((1) INAF - Padova Astronomical Observatory, (2) Astronomical Department, Padova University)
17 pages, 18 figures, accepted for publication in A&A
We extend our theoretical computations for low-mass stars to
intermediate-mass and massive stars, for which few databases exist in the
literature.
(more)
12 11 09 - 22:39 |
No comments
Gas Accretion from a Circumbinary Disk
http://www.arxiv.org/abs/0911.2032
Tomoyuki Hanawa,
Yasuhiro Ochi,
Koichi Ando
41 pages, 25 PostScript figures, uses AASTeX, to appear in ApJ
A new computational scheme is developed to study gas accretion from a
circumbinary disk.
(more)
12 11 09 - 22:35 |
No comments
Fast and Large Volume Simulations of the 21 cm Signal from the
Reionization and pre-Reionization Epochs
http://www.arxiv.org/abs/0911.2219
M. G. Santos (1),
L. Ferramacho (1),
M. B. Silva (1),
A. Amblard (2),
A. Cooray (2) ((1) CENTRA - IST, (2) UC Irvine)
14 pages and 15 figures
While limited to low spatial resolution, the next generation low-frequency
radio interferometers that target 21 cm observations during the era of
reionization and prior will have instantaneous fields-of-view that are many
tens of square degrees on the sky.
(more)
12 11 09 - 22:32 |
No comments
Tuesday, 10 November
Radiation thermo-chemical models of protoplanetary disks II. Line
diagnostics
http://www.arxiv.org/abs/0911.1949
I. Kamp,
I. Tilling,
P. Woitke,
W.-F. Thi,
M. Hogerheijde
accepted for publication in A&A
Methods.
(more)
10 11 09 - 22:21 |
No comments
Solar-Terrestrial Simulations of CMEs with a Realistic Initiation
Mechanism: Case Study for Active Region 10069
http://www.arxiv.org/abs/0911.1895
N. Lugaz,
I. I. Roussev,
I. V. Sokolov,
C. Jacobs
4 pages, 2 figures, refereed proceedings for Solar Wind 12
Most simulations of coronal mass ejections (CMEs) to date either focus on the
interplanetary propagation of a giant plasma "blob" without paying too much
attention to its origin and to the formation process or they focus on the
complex evolution of the coronal magnetic field due to (sub-)photospheric
motions which result in an eruption.
(more)
10 11 09 - 22:20 |
No comments
Exploring the $P_{cyc}$ vs $P_{rot}$ relation with flux transport dynamo
models of solar-like stars
http://www.arxiv.org/abs/0911.1947
L. Jouve (1,2),
B.P. Brown (3),
A.S. Brun (1,3)
12 pages, 8 figures, accepted for publication by A&A 1: AIM, CEA/DSM-CNRS-Univ. Paris 7, IRFU/SAp, France, 2: D.A.M.T.P., Centre for Mathematical Sciences, Univ. of Cambridge, UK, 3: JILA and Department of Astrophysical and Planetary Sciences, Univ. of Colorado, USA
Aims: To understand stellar magnetism and to test the validity of the
Babcock-Leighton flux transport mean field dynamo models with stellar activity
observations Methods: 2-D mean field dynamo models at various rotation rates
are computed with the STELEM code to study the sensitivity of the activity
cycle period and butterfly diagram to parameter changes and are compared to
observational data.
(more)
10 11 09 - 22:20 |
No comments
Virtual Observatory: Science capabilities and scientific results
http://www.arxiv.org/abs/0911.1878
Evanthia Hatziminaoglou (ESO, Garching)
10 pages, 5 figures, invited talk, proceedings of the 9th Hellenic Astronomical Society Conference, Athens, 20-24 September 2009
The virtual observatory (VO) is a collection of interoperable data archives,
tools and applications that together form an environment in which original
astronomical research can be carried out.
(more)
10 11 09 - 22:19 |
No comments
Revisiting 2D Numerical Models for the 19th century outbursts of $\eta$
Carinae
http://www.arxiv.org/abs/0911.1808
R.F. González,
A.M. Villa,
G.C. Gómez,
E.M. de Gouveia Dal Pino,
A.C. Raga,
J. Cantó,
P.F. Velázquez,
E. de la Fuente
accepted for publication in MNRAS
We present here new results of two-dimensional hydrodynamical simulations of
the eruptive events of the 1840s (the great) and the 1890s (the minor)
eruptions suffered by the massive star $\eta$ Car.
(more)
10 11 09 - 22:19 |
No comments
Structure, Kinematics, and Chemical Enrichment Patterns after Major
Gas-Rich Disc-Disc Mergers
http://www.arxiv.org/abs/0911.1801
Simon Richard,
Chris B. Brook,
Hugo Martel,
Daisuke Kawata,
Brad K. Gibson,
Patricia Sanchez-Blazquez
17 pages, 20 figures, to be published in MNRAS
We used an N-body smoothed particle hydrodynamics algorithm, with a detailed
treatment of star formation, supernovae feedback, and chemical enrichment, to
perform eight simulations of mergers between gas-rich disc galaxies.
(more)
10 11 09 - 22:18 |
No comments
Dependence of the Star Formation Efficiency on the Parameters of
Molecular Cloud Formation Simulations
http://www.arxiv.org/abs/0911.1795
Yetli Rosas-Guevara,
Enrique Vazquez-Semadeni,
Gilberto C. Gomez,
A.-Katharina Jappsen
19 pages, submitted to MNRAS
We investigate the response of the star formation efficiency (SFE) to the
main parameters of simulations of molecular cloud formation by the collision of
warm diffuse medium (WNM) cylindrical streams, neglecting stellar feedback and
magnetic fields.
(more)
10 11 09 - 22:17 |
No comments
Chemical Evolution in Hierarchical Models of Cosmic Structure II: The
Formation of the Milky Way Stellar Halo and the Distribution of the Oldest
Stars
http://www.arxiv.org/abs/0911.1786
Jason Tumlinson (STScI)
Submitted to ApJ, 22 pages emulateapj, 15 color figures
This paper presents theoretical star formation and chemical enrichment
histories for the stellar halo of the Milky Way based on new chemodynamical
modeling.
(more)
10 11 09 - 22:15 |
No comments
Computing the Bayesian Evidence from a Markov Chain Monte Carlo
Simulation of the Posterior Distribution
http://www.arxiv.org/abs/0911.1777
Martin D. Weinberg
22 pages, 6 figures, submitted to Bayesian Analysis
Computation of the marginal likelihood or "Bayesian Evidence" from a
simulated posterior distribution is central to Bayesian model selection but is
fraught with difficulty.
(more)
10 11 09 - 22:15 |
No comments
Monday, 09 November
A Simultaneous Stacking and Deblending Algorithm for Astronomical Images
http://www.arxiv.org/abs/0911.1592
Peter Kurczynski,
Eric Gawiser
submitted to The Astronomical Journal. 18 pages, 6 figures
Stacking analysis is a means of detecting faint sources using a priori
position information to estimate an aggregate signal from individually
undetected objects.
(more)
09 11 09 - 23:39 |
No comments
Detecting the orientation of magnetic fields in galaxy clusters
http://www.arxiv.org/abs/0911.2476Christoph Pfrommer (1), L. Jonathan Dursi (2, 1), ((1) CITA, (2) SciNet)
this http URL
Clusters of galaxies, filled with hot, magnetised plasma, are the largest bound objects in existence and an important touchstone in understanding the formation of structures in our Universe.
(more)
15 11 09 - 21:00 |
No comments
Detecting the orientation of magnetic fields in galaxy clusters
http://www.arxiv.org/abs/0911.2476
Christoph Pfrommer (1),
L. Jonathan Dursi (2, 1), ((1) CITA, (2) SciNet)
this http URL
Clusters of galaxies, filled with hot, magnetised plasma, are the largest
bound objects in existence and an important touchstone in understanding the
formation of structures in our Universe.
(more)
15 11 09 - 20:57 |
No comments
Detecting the orientation of magnetic fields in galaxy clusters
http://www.arxiv.org/abs/0911.2476
Christoph Pfrommer (1),
L. Jonathan Dursi (2, 1), ((1) CITA, (2) SciNet)
this http URL
Clusters of galaxies, filled with hot, magnetised plasma, are the largest
bound objects in existence and an important touchstone in understanding the
formation of structures in our Universe.
(more)
15 11 09 - 20:44 |
No comments
Interactions between a massive planet and a disc
http://www.arxiv.org/abs/0911.2468
Pau Amaro-Seoane,
Ignasi Ribas,
Ulf Loeckmann,
Holger Baumgardt
Two-page contribution to "Pathways towards habitable planets". An extended version of this note will be soon published in ApJ (needs asp2006.sty, psfig.sty and picins.sty, included)
We analyse the potential migration of massive planets forming far away from
an inner planetary system.
(more)
15 11 09 - 20:43 |
No comments
Thursday, 12 November
Simulations of momentum feedback by black hole winds
http://www.arxiv.org/abs/0911.2434
Sergei Nayakshin,
Chris Power (Leicester)
17 pages, to appear in MNRAS
The observed super-massive black hole (SMBH) mass -- galaxy velocity
dispersion ($M_{\rm bh} - \sigma$) correlation may be established when
winds/outflows from the SMBH drive gas out of the potential wells of classical
bulges.
(more)
12 11 09 - 22:40 |
No comments
Scaled solar tracks and isochrones in a large region of the Z-Y plane.
II. From 2.5 to 20 solar masses
http://www.arxiv.org/abs/0911.2419
G. Bertelli (1),
E. Nasi (1),
L. Girardi (1),
P. Marigo (2) ((1) INAF - Padova Astronomical Observatory, (2) Astronomical Department, Padova University)
17 pages, 18 figures, accepted for publication in A&A
We extend our theoretical computations for low-mass stars to
intermediate-mass and massive stars, for which few databases exist in the
literature.
(more)
12 11 09 - 22:39 |
No comments
Gas Accretion from a Circumbinary Disk
http://www.arxiv.org/abs/0911.2032
Tomoyuki Hanawa,
Yasuhiro Ochi,
Koichi Ando
41 pages, 25 PostScript figures, uses AASTeX, to appear in ApJ
A new computational scheme is developed to study gas accretion from a
circumbinary disk.
(more)
12 11 09 - 22:35 |
No comments
Fast and Large Volume Simulations of the 21 cm Signal from the
Reionization and pre-Reionization Epochs
http://www.arxiv.org/abs/0911.2219
M. G. Santos (1),
L. Ferramacho (1),
M. B. Silva (1),
A. Amblard (2),
A. Cooray (2) ((1) CENTRA - IST, (2) UC Irvine)
14 pages and 15 figures
While limited to low spatial resolution, the next generation low-frequency
radio interferometers that target 21 cm observations during the era of
reionization and prior will have instantaneous fields-of-view that are many
tens of square degrees on the sky.
(more)
12 11 09 - 22:32 |
No comments
Tuesday, 10 November
Radiation thermo-chemical models of protoplanetary disks II. Line
diagnostics
http://www.arxiv.org/abs/0911.1949
I. Kamp,
I. Tilling,
P. Woitke,
W.-F. Thi,
M. Hogerheijde
accepted for publication in A&A
Methods.
(more)
10 11 09 - 22:21 |
No comments
Solar-Terrestrial Simulations of CMEs with a Realistic Initiation
Mechanism: Case Study for Active Region 10069
http://www.arxiv.org/abs/0911.1895
N. Lugaz,
I. I. Roussev,
I. V. Sokolov,
C. Jacobs
4 pages, 2 figures, refereed proceedings for Solar Wind 12
Most simulations of coronal mass ejections (CMEs) to date either focus on the
interplanetary propagation of a giant plasma "blob" without paying too much
attention to its origin and to the formation process or they focus on the
complex evolution of the coronal magnetic field due to (sub-)photospheric
motions which result in an eruption.
(more)
10 11 09 - 22:20 |
No comments
Exploring the $P_{cyc}$ vs $P_{rot}$ relation with flux transport dynamo
models of solar-like stars
http://www.arxiv.org/abs/0911.1947
L. Jouve (1,2),
B.P. Brown (3),
A.S. Brun (1,3)
12 pages, 8 figures, accepted for publication by A&A 1: AIM, CEA/DSM-CNRS-Univ. Paris 7, IRFU/SAp, France, 2: D.A.M.T.P., Centre for Mathematical Sciences, Univ. of Cambridge, UK, 3: JILA and Department of Astrophysical and Planetary Sciences, Univ. of Colorado, USA
Aims: To understand stellar magnetism and to test the validity of the
Babcock-Leighton flux transport mean field dynamo models with stellar activity
observations Methods: 2-D mean field dynamo models at various rotation rates
are computed with the STELEM code to study the sensitivity of the activity
cycle period and butterfly diagram to parameter changes and are compared to
observational data.
(more)
10 11 09 - 22:20 |
No comments
Virtual Observatory: Science capabilities and scientific results
http://www.arxiv.org/abs/0911.1878
Evanthia Hatziminaoglou (ESO, Garching)
10 pages, 5 figures, invited talk, proceedings of the 9th Hellenic Astronomical Society Conference, Athens, 20-24 September 2009
The virtual observatory (VO) is a collection of interoperable data archives,
tools and applications that together form an environment in which original
astronomical research can be carried out.
(more)
10 11 09 - 22:19 |
No comments
Revisiting 2D Numerical Models for the 19th century outbursts of $\eta$
Carinae
http://www.arxiv.org/abs/0911.1808
R.F. González,
A.M. Villa,
G.C. Gómez,
E.M. de Gouveia Dal Pino,
A.C. Raga,
J. Cantó,
P.F. Velázquez,
E. de la Fuente
accepted for publication in MNRAS
We present here new results of two-dimensional hydrodynamical simulations of
the eruptive events of the 1840s (the great) and the 1890s (the minor)
eruptions suffered by the massive star $\eta$ Car.
(more)
10 11 09 - 22:19 |
No comments
Structure, Kinematics, and Chemical Enrichment Patterns after Major
Gas-Rich Disc-Disc Mergers
http://www.arxiv.org/abs/0911.1801
Simon Richard,
Chris B. Brook,
Hugo Martel,
Daisuke Kawata,
Brad K. Gibson,
Patricia Sanchez-Blazquez
17 pages, 20 figures, to be published in MNRAS
We used an N-body smoothed particle hydrodynamics algorithm, with a detailed
treatment of star formation, supernovae feedback, and chemical enrichment, to
perform eight simulations of mergers between gas-rich disc galaxies.
(more)
10 11 09 - 22:18 |
No comments
Dependence of the Star Formation Efficiency on the Parameters of
Molecular Cloud Formation Simulations
http://www.arxiv.org/abs/0911.1795
Yetli Rosas-Guevara,
Enrique Vazquez-Semadeni,
Gilberto C. Gomez,
A.-Katharina Jappsen
19 pages, submitted to MNRAS
We investigate the response of the star formation efficiency (SFE) to the
main parameters of simulations of molecular cloud formation by the collision of
warm diffuse medium (WNM) cylindrical streams, neglecting stellar feedback and
magnetic fields.
(more)
10 11 09 - 22:17 |
No comments
Chemical Evolution in Hierarchical Models of Cosmic Structure II: The
Formation of the Milky Way Stellar Halo and the Distribution of the Oldest
Stars
http://www.arxiv.org/abs/0911.1786
Jason Tumlinson (STScI)
Submitted to ApJ, 22 pages emulateapj, 15 color figures
This paper presents theoretical star formation and chemical enrichment
histories for the stellar halo of the Milky Way based on new chemodynamical
modeling.
(more)
10 11 09 - 22:15 |
No comments
Computing the Bayesian Evidence from a Markov Chain Monte Carlo
Simulation of the Posterior Distribution
http://www.arxiv.org/abs/0911.1777
Martin D. Weinberg
22 pages, 6 figures, submitted to Bayesian Analysis
Computation of the marginal likelihood or "Bayesian Evidence" from a
simulated posterior distribution is central to Bayesian model selection but is
fraught with difficulty.
(more)
10 11 09 - 22:15 |
No comments
Monday, 09 November
A Simultaneous Stacking and Deblending Algorithm for Astronomical Images
http://www.arxiv.org/abs/0911.1592
Peter Kurczynski,
Eric Gawiser
submitted to The Astronomical Journal. 18 pages, 6 figures
Stacking analysis is a means of detecting faint sources using a priori
position information to estimate an aggregate signal from individually
undetected objects.
(more)
09 11 09 - 23:39 |
No comments
Detecting the orientation of magnetic fields in galaxy clusters
http://www.arxiv.org/abs/0911.2476Christoph Pfrommer (1), L. Jonathan Dursi (2, 1), ((1) CITA, (2) SciNet)
this http URL
Clusters of galaxies, filled with hot, magnetised plasma, are the largest bound objects in existence and an important touchstone in understanding the formation of structures in our Universe.
(more)
15 11 09 - 20:57 |
No comments
Detecting the orientation of magnetic fields in galaxy clusters
http://www.arxiv.org/abs/0911.2476
Christoph Pfrommer (1),
L. Jonathan Dursi (2, 1), ((1) CITA, (2) SciNet)
this http URL
Clusters of galaxies, filled with hot, magnetised plasma, are the largest
bound objects in existence and an important touchstone in understanding the
formation of structures in our Universe.
(more)
15 11 09 - 20:44 |
No comments
Interactions between a massive planet and a disc
http://www.arxiv.org/abs/0911.2468
Pau Amaro-Seoane,
Ignasi Ribas,
Ulf Loeckmann,
Holger Baumgardt
Two-page contribution to "Pathways towards habitable planets". An extended version of this note will be soon published in ApJ (needs asp2006.sty, psfig.sty and picins.sty, included)
We analyse the potential migration of massive planets forming far away from
an inner planetary system.
(more)
15 11 09 - 20:43 |
No comments
Thursday, 12 November
Simulations of momentum feedback by black hole winds
http://www.arxiv.org/abs/0911.2434
Sergei Nayakshin,
Chris Power (Leicester)
17 pages, to appear in MNRAS
The observed super-massive black hole (SMBH) mass -- galaxy velocity
dispersion ($M_{\rm bh} - \sigma$) correlation may be established when
winds/outflows from the SMBH drive gas out of the potential wells of classical
bulges.
(more)
12 11 09 - 22:40 |
No comments
Scaled solar tracks and isochrones in a large region of the Z-Y plane.
II. From 2.5 to 20 solar masses
http://www.arxiv.org/abs/0911.2419
G. Bertelli (1),
E. Nasi (1),
L. Girardi (1),
P. Marigo (2) ((1) INAF - Padova Astronomical Observatory, (2) Astronomical Department, Padova University)
17 pages, 18 figures, accepted for publication in A&A
We extend our theoretical computations for low-mass stars to
intermediate-mass and massive stars, for which few databases exist in the
literature.
(more)
12 11 09 - 22:39 |
No comments
Gas Accretion from a Circumbinary Disk
http://www.arxiv.org/abs/0911.2032
Tomoyuki Hanawa,
Yasuhiro Ochi,
Koichi Ando
41 pages, 25 PostScript figures, uses AASTeX, to appear in ApJ
A new computational scheme is developed to study gas accretion from a
circumbinary disk.
(more)
12 11 09 - 22:35 |
No comments
Fast and Large Volume Simulations of the 21 cm Signal from the
Reionization and pre-Reionization Epochs
http://www.arxiv.org/abs/0911.2219
M. G. Santos (1),
L. Ferramacho (1),
M. B. Silva (1),
A. Amblard (2),
A. Cooray (2) ((1) CENTRA - IST, (2) UC Irvine)
14 pages and 15 figures
While limited to low spatial resolution, the next generation low-frequency
radio interferometers that target 21 cm observations during the era of
reionization and prior will have instantaneous fields-of-view that are many
tens of square degrees on the sky.
(more)
12 11 09 - 22:32 |
No comments
Tuesday, 10 November
Radiation thermo-chemical models of protoplanetary disks II. Line
diagnostics
http://www.arxiv.org/abs/0911.1949
I. Kamp,
I. Tilling,
P. Woitke,
W.-F. Thi,
M. Hogerheijde
accepted for publication in A&A
Methods.
(more)
10 11 09 - 22:21 |
No comments
Solar-Terrestrial Simulations of CMEs with a Realistic Initiation
Mechanism: Case Study for Active Region 10069
http://www.arxiv.org/abs/0911.1895
N. Lugaz,
I. I. Roussev,
I. V. Sokolov,
C. Jacobs
4 pages, 2 figures, refereed proceedings for Solar Wind 12
Most simulations of coronal mass ejections (CMEs) to date either focus on the
interplanetary propagation of a giant plasma "blob" without paying too much
attention to its origin and to the formation process or they focus on the
complex evolution of the coronal magnetic field due to (sub-)photospheric
motions which result in an eruption.
(more)
10 11 09 - 22:20 |
No comments
Exploring the $P_{cyc}$ vs $P_{rot}$ relation with flux transport dynamo
models of solar-like stars
http://www.arxiv.org/abs/0911.1947
L. Jouve (1,2),
B.P. Brown (3),
A.S. Brun (1,3)
12 pages, 8 figures, accepted for publication by A&A 1: AIM, CEA/DSM-CNRS-Univ. Paris 7, IRFU/SAp, France, 2: D.A.M.T.P., Centre for Mathematical Sciences, Univ. of Cambridge, UK, 3: JILA and Department of Astrophysical and Planetary Sciences, Univ. of Colorado, USA
Aims: To understand stellar magnetism and to test the validity of the
Babcock-Leighton flux transport mean field dynamo models with stellar activity
observations Methods: 2-D mean field dynamo models at various rotation rates
are computed with the STELEM code to study the sensitivity of the activity
cycle period and butterfly diagram to parameter changes and are compared to
observational data.
(more)
10 11 09 - 22:20 |
No comments
Virtual Observatory: Science capabilities and scientific results
http://www.arxiv.org/abs/0911.1878
Evanthia Hatziminaoglou (ESO, Garching)
10 pages, 5 figures, invited talk, proceedings of the 9th Hellenic Astronomical Society Conference, Athens, 20-24 September 2009
The virtual observatory (VO) is a collection of interoperable data archives,
tools and applications that together form an environment in which original
astronomical research can be carried out.
(more)
10 11 09 - 22:19 |
No comments
Revisiting 2D Numerical Models for the 19th century outbursts of $\eta$
Carinae
http://www.arxiv.org/abs/0911.1808
R.F. González,
A.M. Villa,
G.C. Gómez,
E.M. de Gouveia Dal Pino,
A.C. Raga,
J. Cantó,
P.F. Velázquez,
E. de la Fuente
accepted for publication in MNRAS
We present here new results of two-dimensional hydrodynamical simulations of
the eruptive events of the 1840s (the great) and the 1890s (the minor)
eruptions suffered by the massive star $\eta$ Car.
(more)
10 11 09 - 22:19 |
No comments
Structure, Kinematics, and Chemical Enrichment Patterns after Major
Gas-Rich Disc-Disc Mergers
http://www.arxiv.org/abs/0911.1801
Simon Richard,
Chris B. Brook,
Hugo Martel,
Daisuke Kawata,
Brad K. Gibson,
Patricia Sanchez-Blazquez
17 pages, 20 figures, to be published in MNRAS
We used an N-body smoothed particle hydrodynamics algorithm, with a detailed
treatment of star formation, supernovae feedback, and chemical enrichment, to
perform eight simulations of mergers between gas-rich disc galaxies.
(more)
10 11 09 - 22:18 |
No comments
Dependence of the Star Formation Efficiency on the Parameters of
Molecular Cloud Formation Simulations
http://www.arxiv.org/abs/0911.1795
Yetli Rosas-Guevara,
Enrique Vazquez-Semadeni,
Gilberto C. Gomez,
A.-Katharina Jappsen
19 pages, submitted to MNRAS
We investigate the response of the star formation efficiency (SFE) to the
main parameters of simulations of molecular cloud formation by the collision of
warm diffuse medium (WNM) cylindrical streams, neglecting stellar feedback and
magnetic fields.
(more)
10 11 09 - 22:17 |
No comments
Chemical Evolution in Hierarchical Models of Cosmic Structure II: The
Formation of the Milky Way Stellar Halo and the Distribution of the Oldest
Stars
http://www.arxiv.org/abs/0911.1786
Jason Tumlinson (STScI)
Submitted to ApJ, 22 pages emulateapj, 15 color figures
This paper presents theoretical star formation and chemical enrichment
histories for the stellar halo of the Milky Way based on new chemodynamical
modeling.
(more)
10 11 09 - 22:15 |
No comments
Computing the Bayesian Evidence from a Markov Chain Monte Carlo
Simulation of the Posterior Distribution
http://www.arxiv.org/abs/0911.1777
Martin D. Weinberg
22 pages, 6 figures, submitted to Bayesian Analysis
Computation of the marginal likelihood or "Bayesian Evidence" from a
simulated posterior distribution is central to Bayesian model selection but is
fraught with difficulty.
(more)
10 11 09 - 22:15 |
No comments
Monday, 09 November
A Simultaneous Stacking and Deblending Algorithm for Astronomical Images
http://www.arxiv.org/abs/0911.1592
Peter Kurczynski,
Eric Gawiser
submitted to The Astronomical Journal. 18 pages, 6 figures
Stacking analysis is a means of detecting faint sources using a priori
position information to estimate an aggregate signal from individually
undetected objects.
(more)
09 11 09 - 23:39 |
No comments
Detecting the orientation of magnetic fields in galaxy clusters
http://www.arxiv.org/abs/0911.2476Christoph Pfrommer (1), L. Jonathan Dursi (2, 1), ((1) CITA, (2) SciNet)
this http URL
Clusters of galaxies, filled with hot, magnetised plasma, are the largest bound objects in existence and an important touchstone in understanding the formation of structures in our Universe.
(more)
15 11 09 - 20:44 |
No comments
Interactions between a massive planet and a disc
http://www.arxiv.org/abs/0911.2468
Pau Amaro-Seoane,
Ignasi Ribas,
Ulf Loeckmann,
Holger Baumgardt
Two-page contribution to "Pathways towards habitable planets". An extended version of this note will be soon published in ApJ (needs asp2006.sty, psfig.sty and picins.sty, included)
We analyse the potential migration of massive planets forming far away from
an inner planetary system.
(more)
15 11 09 - 20:43 |
No comments
Thursday, 12 November
Simulations of momentum feedback by black hole winds
http://www.arxiv.org/abs/0911.2434
Sergei Nayakshin,
Chris Power (Leicester)
17 pages, to appear in MNRAS
The observed super-massive black hole (SMBH) mass -- galaxy velocity
dispersion ($M_{\rm bh} - \sigma$) correlation may be established when
winds/outflows from the SMBH drive gas out of the potential wells of classical
bulges.
(more)
12 11 09 - 22:40 |
No comments
Scaled solar tracks and isochrones in a large region of the Z-Y plane.
II. From 2.5 to 20 solar masses
http://www.arxiv.org/abs/0911.2419
G. Bertelli (1),
E. Nasi (1),
L. Girardi (1),
P. Marigo (2) ((1) INAF - Padova Astronomical Observatory, (2) Astronomical Department, Padova University)
17 pages, 18 figures, accepted for publication in A&A
We extend our theoretical computations for low-mass stars to
intermediate-mass and massive stars, for which few databases exist in the
literature.
(more)
12 11 09 - 22:39 |
No comments
Gas Accretion from a Circumbinary Disk
http://www.arxiv.org/abs/0911.2032
Tomoyuki Hanawa,
Yasuhiro Ochi,
Koichi Ando
41 pages, 25 PostScript figures, uses AASTeX, to appear in ApJ
A new computational scheme is developed to study gas accretion from a
circumbinary disk.
(more)
12 11 09 - 22:35 |
No comments
Fast and Large Volume Simulations of the 21 cm Signal from the
Reionization and pre-Reionization Epochs
http://www.arxiv.org/abs/0911.2219
M. G. Santos (1),
L. Ferramacho (1),
M. B. Silva (1),
A. Amblard (2),
A. Cooray (2) ((1) CENTRA - IST, (2) UC Irvine)
14 pages and 15 figures
While limited to low spatial resolution, the next generation low-frequency
radio interferometers that target 21 cm observations during the era of
reionization and prior will have instantaneous fields-of-view that are many
tens of square degrees on the sky.
(more)
12 11 09 - 22:32 |
No comments
Tuesday, 10 November
Radiation thermo-chemical models of protoplanetary disks II. Line
diagnostics
http://www.arxiv.org/abs/0911.1949
I. Kamp,
I. Tilling,
P. Woitke,
W.-F. Thi,
M. Hogerheijde
accepted for publication in A&A
Methods.
(more)
10 11 09 - 22:21 |
No comments
Solar-Terrestrial Simulations of CMEs with a Realistic Initiation
Mechanism: Case Study for Active Region 10069
http://www.arxiv.org/abs/0911.1895
N. Lugaz,
I. I. Roussev,
I. V. Sokolov,
C. Jacobs
4 pages, 2 figures, refereed proceedings for Solar Wind 12
Most simulations of coronal mass ejections (CMEs) to date either focus on the
interplanetary propagation of a giant plasma "blob" without paying too much
attention to its origin and to the formation process or they focus on the
complex evolution of the coronal magnetic field due to (sub-)photospheric
motions which result in an eruption.
(more)
10 11 09 - 22:20 |
No comments
Exploring the $P_{cyc}$ vs $P_{rot}$ relation with flux transport dynamo
models of solar-like stars
http://www.arxiv.org/abs/0911.1947
L. Jouve (1,2),
B.P. Brown (3),
A.S. Brun (1,3)
12 pages, 8 figures, accepted for publication by A&A 1: AIM, CEA/DSM-CNRS-Univ. Paris 7, IRFU/SAp, France, 2: D.A.M.T.P., Centre for Mathematical Sciences, Univ. of Cambridge, UK, 3: JILA and Department of Astrophysical and Planetary Sciences, Univ. of Colorado, USA
Aims: To understand stellar magnetism and to test the validity of the
Babcock-Leighton flux transport mean field dynamo models with stellar activity
observations Methods: 2-D mean field dynamo models at various rotation rates
are computed with the STELEM code to study the sensitivity of the activity
cycle period and butterfly diagram to parameter changes and are compared to
observational data.
(more)
10 11 09 - 22:20 |
No comments
Virtual Observatory: Science capabilities and scientific results
http://www.arxiv.org/abs/0911.1878
Evanthia Hatziminaoglou (ESO, Garching)
10 pages, 5 figures, invited talk, proceedings of the 9th Hellenic Astronomical Society Conference, Athens, 20-24 September 2009
The virtual observatory (VO) is a collection of interoperable data archives,
tools and applications that together form an environment in which original
astronomical research can be carried out.
(more)
10 11 09 - 22:19 |
No comments
Revisiting 2D Numerical Models for the 19th century outbursts of $\eta$
Carinae
http://www.arxiv.org/abs/0911.1808
R.F. González,
A.M. Villa,
G.C. Gómez,
E.M. de Gouveia Dal Pino,
A.C. Raga,
J. Cantó,
P.F. Velázquez,
E. de la Fuente
accepted for publication in MNRAS
We present here new results of two-dimensional hydrodynamical simulations of
the eruptive events of the 1840s (the great) and the 1890s (the minor)
eruptions suffered by the massive star $\eta$ Car.
(more)
10 11 09 - 22:19 |
No comments
Structure, Kinematics, and Chemical Enrichment Patterns after Major
Gas-Rich Disc-Disc Mergers
http://www.arxiv.org/abs/0911.1801
Simon Richard,
Chris B. Brook,
Hugo Martel,
Daisuke Kawata,
Brad K. Gibson,
Patricia Sanchez-Blazquez
17 pages, 20 figures, to be published in MNRAS
We used an N-body smoothed particle hydrodynamics algorithm, with a detailed
treatment of star formation, supernovae feedback, and chemical enrichment, to
perform eight simulations of mergers between gas-rich disc galaxies.
(more)
10 11 09 - 22:18 |
No comments
Dependence of the Star Formation Efficiency on the Parameters of
Molecular Cloud Formation Simulations
http://www.arxiv.org/abs/0911.1795
Yetli Rosas-Guevara,
Enrique Vazquez-Semadeni,
Gilberto C. Gomez,
A.-Katharina Jappsen
19 pages, submitted to MNRAS
We investigate the response of the star formation efficiency (SFE) to the
main parameters of simulations of molecular cloud formation by the collision of
warm diffuse medium (WNM) cylindrical streams, neglecting stellar feedback and
magnetic fields.
(more)
10 11 09 - 22:17 |
No comments
Chemical Evolution in Hierarchical Models of Cosmic Structure II: The
Formation of the Milky Way Stellar Halo and the Distribution of the Oldest
Stars
http://www.arxiv.org/abs/0911.1786
Jason Tumlinson (STScI)
Submitted to ApJ, 22 pages emulateapj, 15 color figures
This paper presents theoretical star formation and chemical enrichment
histories for the stellar halo of the Milky Way based on new chemodynamical
modeling.
(more)
10 11 09 - 22:15 |
No comments
Computing the Bayesian Evidence from a Markov Chain Monte Carlo
Simulation of the Posterior Distribution
http://www.arxiv.org/abs/0911.1777
Martin D. Weinberg
22 pages, 6 figures, submitted to Bayesian Analysis
Computation of the marginal likelihood or "Bayesian Evidence" from a
simulated posterior distribution is central to Bayesian model selection but is
fraught with difficulty.
(more)
10 11 09 - 22:15 |
No comments
Monday, 09 November
A Simultaneous Stacking and Deblending Algorithm for Astronomical Images
http://www.arxiv.org/abs/0911.1592
Peter Kurczynski,
Eric Gawiser
submitted to The Astronomical Journal. 18 pages, 6 figures
Stacking analysis is a means of detecting faint sources using a priori
position information to estimate an aggregate signal from individually
undetected objects.
(more)
09 11 09 - 23:39 |
No comments
Interactions between a massive planet and a disc
http://www.arxiv.org/abs/0911.2468Pau Amaro-Seoane, Ignasi Ribas, Ulf Loeckmann, Holger Baumgardt
Two-page contribution to "Pathways towards habitable planets". An extended version of this note will be soon published in ApJ (needs asp2006.sty, psfig.sty and picins.sty, included)
We analyse the potential migration of massive planets forming far away from an inner planetary system.
(more)
15 11 09 - 20:43 |
No comments
Thursday, 12 November
Simulations of momentum feedback by black hole winds
http://www.arxiv.org/abs/0911.2434
Sergei Nayakshin,
Chris Power (Leicester)
17 pages, to appear in MNRAS
The observed super-massive black hole (SMBH) mass -- galaxy velocity
dispersion ($M_{\rm bh} - \sigma$) correlation may be established when
winds/outflows from the SMBH drive gas out of the potential wells of classical
bulges.
(more)
12 11 09 - 22:40 |
No comments
Scaled solar tracks and isochrones in a large region of the Z-Y plane.
II. From 2.5 to 20 solar masses
http://www.arxiv.org/abs/0911.2419
G. Bertelli (1),
E. Nasi (1),
L. Girardi (1),
P. Marigo (2) ((1) INAF - Padova Astronomical Observatory, (2) Astronomical Department, Padova University)
17 pages, 18 figures, accepted for publication in A&A
We extend our theoretical computations for low-mass stars to
intermediate-mass and massive stars, for which few databases exist in the
literature.
(more)
12 11 09 - 22:39 |
No comments
Gas Accretion from a Circumbinary Disk
http://www.arxiv.org/abs/0911.2032
Tomoyuki Hanawa,
Yasuhiro Ochi,
Koichi Ando
41 pages, 25 PostScript figures, uses AASTeX, to appear in ApJ
A new computational scheme is developed to study gas accretion from a
circumbinary disk.
(more)
12 11 09 - 22:35 |
No comments
Fast and Large Volume Simulations of the 21 cm Signal from the
Reionization and pre-Reionization Epochs
http://www.arxiv.org/abs/0911.2219
M. G. Santos (1),
L. Ferramacho (1),
M. B. Silva (1),
A. Amblard (2),
A. Cooray (2) ((1) CENTRA - IST, (2) UC Irvine)
14 pages and 15 figures
While limited to low spatial resolution, the next generation low-frequency
radio interferometers that target 21 cm observations during the era of
reionization and prior will have instantaneous fields-of-view that are many
tens of square degrees on the sky.
(more)
12 11 09 - 22:32 |
No comments
Tuesday, 10 November
Radiation thermo-chemical models of protoplanetary disks II. Line
diagnostics
http://www.arxiv.org/abs/0911.1949
I. Kamp,
I. Tilling,
P. Woitke,
W.-F. Thi,
M. Hogerheijde
accepted for publication in A&A
Methods.
(more)
10 11 09 - 22:21 |
No comments
Solar-Terrestrial Simulations of CMEs with a Realistic Initiation
Mechanism: Case Study for Active Region 10069
http://www.arxiv.org/abs/0911.1895
N. Lugaz,
I. I. Roussev,
I. V. Sokolov,
C. Jacobs
4 pages, 2 figures, refereed proceedings for Solar Wind 12
Most simulations of coronal mass ejections (CMEs) to date either focus on the
interplanetary propagation of a giant plasma "blob" without paying too much
attention to its origin and to the formation process or they focus on the
complex evolution of the coronal magnetic field due to (sub-)photospheric
motions which result in an eruption.
(more)
10 11 09 - 22:20 |
No comments
Exploring the $P_{cyc}$ vs $P_{rot}$ relation with flux transport dynamo
models of solar-like stars
http://www.arxiv.org/abs/0911.1947
L. Jouve (1,2),
B.P. Brown (3),
A.S. Brun (1,3)
12 pages, 8 figures, accepted for publication by A&A 1: AIM, CEA/DSM-CNRS-Univ. Paris 7, IRFU/SAp, France, 2: D.A.M.T.P., Centre for Mathematical Sciences, Univ. of Cambridge, UK, 3: JILA and Department of Astrophysical and Planetary Sciences, Univ. of Colorado, USA
Aims: To understand stellar magnetism and to test the validity of the
Babcock-Leighton flux transport mean field dynamo models with stellar activity
observations Methods: 2-D mean field dynamo models at various rotation rates
are computed with the STELEM code to study the sensitivity of the activity
cycle period and butterfly diagram to parameter changes and are compared to
observational data.
(more)
10 11 09 - 22:20 |
No comments
Virtual Observatory: Science capabilities and scientific results
http://www.arxiv.org/abs/0911.1878
Evanthia Hatziminaoglou (ESO, Garching)
10 pages, 5 figures, invited talk, proceedings of the 9th Hellenic Astronomical Society Conference, Athens, 20-24 September 2009
The virtual observatory (VO) is a collection of interoperable data archives,
tools and applications that together form an environment in which original
astronomical research can be carried out.
(more)
10 11 09 - 22:19 |
No comments
Revisiting 2D Numerical Models for the 19th century outbursts of $\eta$
Carinae
http://www.arxiv.org/abs/0911.1808
R.F. González,
A.M. Villa,
G.C. Gómez,
E.M. de Gouveia Dal Pino,
A.C. Raga,
J. Cantó,
P.F. Velázquez,
E. de la Fuente
accepted for publication in MNRAS
We present here new results of two-dimensional hydrodynamical simulations of
the eruptive events of the 1840s (the great) and the 1890s (the minor)
eruptions suffered by the massive star $\eta$ Car.
(more)
10 11 09 - 22:19 |
No comments
Structure, Kinematics, and Chemical Enrichment Patterns after Major
Gas-Rich Disc-Disc Mergers
http://www.arxiv.org/abs/0911.1801
Simon Richard,
Chris B. Brook,
Hugo Martel,
Daisuke Kawata,
Brad K. Gibson,
Patricia Sanchez-Blazquez
17 pages, 20 figures, to be published in MNRAS
We used an N-body smoothed particle hydrodynamics algorithm, with a detailed
treatment of star formation, supernovae feedback, and chemical enrichment, to
perform eight simulations of mergers between gas-rich disc galaxies.
(more)
10 11 09 - 22:18 |
No comments
Dependence of the Star Formation Efficiency on the Parameters of
Molecular Cloud Formation Simulations
http://www.arxiv.org/abs/0911.1795
Yetli Rosas-Guevara,
Enrique Vazquez-Semadeni,
Gilberto C. Gomez,
A.-Katharina Jappsen
19 pages, submitted to MNRAS
We investigate the response of the star formation efficiency (SFE) to the
main parameters of simulations of molecular cloud formation by the collision of
warm diffuse medium (WNM) cylindrical streams, neglecting stellar feedback and
magnetic fields.
(more)
10 11 09 - 22:17 |
No comments
Chemical Evolution in Hierarchical Models of Cosmic Structure II: The
Formation of the Milky Way Stellar Halo and the Distribution of the Oldest
Stars
http://www.arxiv.org/abs/0911.1786
Jason Tumlinson (STScI)
Submitted to ApJ, 22 pages emulateapj, 15 color figures
This paper presents theoretical star formation and chemical enrichment
histories for the stellar halo of the Milky Way based on new chemodynamical
modeling.
(more)
10 11 09 - 22:15 |
No comments
Computing the Bayesian Evidence from a Markov Chain Monte Carlo
Simulation of the Posterior Distribution
http://www.arxiv.org/abs/0911.1777
Martin D. Weinberg
22 pages, 6 figures, submitted to Bayesian Analysis
Computation of the marginal likelihood or "Bayesian Evidence" from a
simulated posterior distribution is central to Bayesian model selection but is
fraught with difficulty.
(more)
10 11 09 - 22:15 |
No comments
Monday, 09 November
A Simultaneous Stacking and Deblending Algorithm for Astronomical Images
http://www.arxiv.org/abs/0911.1592
Peter Kurczynski,
Eric Gawiser
submitted to The Astronomical Journal. 18 pages, 6 figures
Stacking analysis is a means of detecting faint sources using a priori
position information to estimate an aggregate signal from individually
undetected objects.
(more)
09 11 09 - 23:39 |
No comments
Simulations of momentum feedback by black hole winds
http://www.arxiv.org/abs/0911.2434Sergei Nayakshin, Chris Power (Leicester)
17 pages, to appear in MNRAS
The observed super-massive black hole (SMBH) mass -- galaxy velocity dispersion ($M_{\rm bh} - \sigma$) correlation may be established when winds/outflows from the SMBH drive gas out of the potential wells of classical bulges.
(more)
12 11 09 - 22:40 |
No comments
Scaled solar tracks and isochrones in a large region of the Z-Y plane.
II. From 2.5 to 20 solar masses
http://www.arxiv.org/abs/0911.2419
G. Bertelli (1),
E. Nasi (1),
L. Girardi (1),
P. Marigo (2) ((1) INAF - Padova Astronomical Observatory, (2) Astronomical Department, Padova University)
17 pages, 18 figures, accepted for publication in A&A
We extend our theoretical computations for low-mass stars to
intermediate-mass and massive stars, for which few databases exist in the
literature.
(more)
12 11 09 - 22:39 |
No comments
Gas Accretion from a Circumbinary Disk
http://www.arxiv.org/abs/0911.2032
Tomoyuki Hanawa,
Yasuhiro Ochi,
Koichi Ando
41 pages, 25 PostScript figures, uses AASTeX, to appear in ApJ
A new computational scheme is developed to study gas accretion from a
circumbinary disk.
(more)
12 11 09 - 22:35 |
No comments
Fast and Large Volume Simulations of the 21 cm Signal from the
Reionization and pre-Reionization Epochs
http://www.arxiv.org/abs/0911.2219
M. G. Santos (1),
L. Ferramacho (1),
M. B. Silva (1),
A. Amblard (2),
A. Cooray (2) ((1) CENTRA - IST, (2) UC Irvine)
14 pages and 15 figures
While limited to low spatial resolution, the next generation low-frequency
radio interferometers that target 21 cm observations during the era of
reionization and prior will have instantaneous fields-of-view that are many
tens of square degrees on the sky.
(more)
12 11 09 - 22:32 |
No comments
Tuesday, 10 November
Radiation thermo-chemical models of protoplanetary disks II. Line
diagnostics
http://www.arxiv.org/abs/0911.1949
I. Kamp,
I. Tilling,
P. Woitke,
W.-F. Thi,
M. Hogerheijde
accepted for publication in A&A
Methods.
(more)
10 11 09 - 22:21 |
No comments
Solar-Terrestrial Simulations of CMEs with a Realistic Initiation
Mechanism: Case Study for Active Region 10069
http://www.arxiv.org/abs/0911.1895
N. Lugaz,
I. I. Roussev,
I. V. Sokolov,
C. Jacobs
4 pages, 2 figures, refereed proceedings for Solar Wind 12
Most simulations of coronal mass ejections (CMEs) to date either focus on the
interplanetary propagation of a giant plasma "blob" without paying too much
attention to its origin and to the formation process or they focus on the
complex evolution of the coronal magnetic field due to (sub-)photospheric
motions which result in an eruption.
(more)
10 11 09 - 22:20 |
No comments
Exploring the $P_{cyc}$ vs $P_{rot}$ relation with flux transport dynamo
models of solar-like stars
http://www.arxiv.org/abs/0911.1947
L. Jouve (1,2),
B.P. Brown (3),
A.S. Brun (1,3)
12 pages, 8 figures, accepted for publication by A&A 1: AIM, CEA/DSM-CNRS-Univ. Paris 7, IRFU/SAp, France, 2: D.A.M.T.P., Centre for Mathematical Sciences, Univ. of Cambridge, UK, 3: JILA and Department of Astrophysical and Planetary Sciences, Univ. of Colorado, USA
Aims: To understand stellar magnetism and to test the validity of the
Babcock-Leighton flux transport mean field dynamo models with stellar activity
observations Methods: 2-D mean field dynamo models at various rotation rates
are computed with the STELEM code to study the sensitivity of the activity
cycle period and butterfly diagram to parameter changes and are compared to
observational data.
(more)
10 11 09 - 22:20 |
No comments
Virtual Observatory: Science capabilities and scientific results
http://www.arxiv.org/abs/0911.1878
Evanthia Hatziminaoglou (ESO, Garching)
10 pages, 5 figures, invited talk, proceedings of the 9th Hellenic Astronomical Society Conference, Athens, 20-24 September 2009
The virtual observatory (VO) is a collection of interoperable data archives,
tools and applications that together form an environment in which original
astronomical research can be carried out.
(more)
10 11 09 - 22:19 |
No comments
Revisiting 2D Numerical Models for the 19th century outbursts of $\eta$
Carinae
http://www.arxiv.org/abs/0911.1808
R.F. González,
A.M. Villa,
G.C. Gómez,
E.M. de Gouveia Dal Pino,
A.C. Raga,
J. Cantó,
P.F. Velázquez,
E. de la Fuente
accepted for publication in MNRAS
We present here new results of two-dimensional hydrodynamical simulations of
the eruptive events of the 1840s (the great) and the 1890s (the minor)
eruptions suffered by the massive star $\eta$ Car.
(more)
10 11 09 - 22:19 |
No comments
Structure, Kinematics, and Chemical Enrichment Patterns after Major
Gas-Rich Disc-Disc Mergers
http://www.arxiv.org/abs/0911.1801
Simon Richard,
Chris B. Brook,
Hugo Martel,
Daisuke Kawata,
Brad K. Gibson,
Patricia Sanchez-Blazquez
17 pages, 20 figures, to be published in MNRAS
We used an N-body smoothed particle hydrodynamics algorithm, with a detailed
treatment of star formation, supernovae feedback, and chemical enrichment, to
perform eight simulations of mergers between gas-rich disc galaxies.
(more)
10 11 09 - 22:18 |
No comments
Dependence of the Star Formation Efficiency on the Parameters of
Molecular Cloud Formation Simulations
http://www.arxiv.org/abs/0911.1795
Yetli Rosas-Guevara,
Enrique Vazquez-Semadeni,
Gilberto C. Gomez,
A.-Katharina Jappsen
19 pages, submitted to MNRAS
We investigate the response of the star formation efficiency (SFE) to the
main parameters of simulations of molecular cloud formation by the collision of
warm diffuse medium (WNM) cylindrical streams, neglecting stellar feedback and
magnetic fields.
(more)
10 11 09 - 22:17 |
No comments
Chemical Evolution in Hierarchical Models of Cosmic Structure II: The
Formation of the Milky Way Stellar Halo and the Distribution of the Oldest
Stars
http://www.arxiv.org/abs/0911.1786
Jason Tumlinson (STScI)
Submitted to ApJ, 22 pages emulateapj, 15 color figures
This paper presents theoretical star formation and chemical enrichment
histories for the stellar halo of the Milky Way based on new chemodynamical
modeling.
(more)
10 11 09 - 22:15 |
No comments
Computing the Bayesian Evidence from a Markov Chain Monte Carlo
Simulation of the Posterior Distribution
http://www.arxiv.org/abs/0911.1777
Martin D. Weinberg
22 pages, 6 figures, submitted to Bayesian Analysis
Computation of the marginal likelihood or "Bayesian Evidence" from a
simulated posterior distribution is central to Bayesian model selection but is
fraught with difficulty.
(more)
10 11 09 - 22:15 |
No comments
Monday, 09 November
A Simultaneous Stacking and Deblending Algorithm for Astronomical Images
http://www.arxiv.org/abs/0911.1592
Peter Kurczynski,
Eric Gawiser
submitted to The Astronomical Journal. 18 pages, 6 figures
Stacking analysis is a means of detecting faint sources using a priori
position information to estimate an aggregate signal from individually
undetected objects.
(more)
09 11 09 - 23:39 |
No comments
Scaled solar tracks and isochrones in a large region of the Z-Y plane. II. From 2.5 to 20 solar masses
http://www.arxiv.org/abs/0911.2419G. Bertelli (1), E. Nasi (1), L. Girardi (1), P. Marigo (2) ((1) INAF - Padova Astronomical Observatory, (2) Astronomical Department, Padova University)
17 pages, 18 figures, accepted for publication in A&A
We extend our theoretical computations for low-mass stars to intermediate-mass and massive stars, for which few databases exist in the literature.
(more)
12 11 09 - 22:39 |
No comments
Gas Accretion from a Circumbinary Disk
http://www.arxiv.org/abs/0911.2032
Tomoyuki Hanawa,
Yasuhiro Ochi,
Koichi Ando
41 pages, 25 PostScript figures, uses AASTeX, to appear in ApJ
A new computational scheme is developed to study gas accretion from a
circumbinary disk.
(more)
12 11 09 - 22:35 |
No comments
Fast and Large Volume Simulations of the 21 cm Signal from the
Reionization and pre-Reionization Epochs
http://www.arxiv.org/abs/0911.2219
M. G. Santos (1),
L. Ferramacho (1),
M. B. Silva (1),
A. Amblard (2),
A. Cooray (2) ((1) CENTRA - IST, (2) UC Irvine)
14 pages and 15 figures
While limited to low spatial resolution, the next generation low-frequency
radio interferometers that target 21 cm observations during the era of
reionization and prior will have instantaneous fields-of-view that are many
tens of square degrees on the sky.
(more)
12 11 09 - 22:32 |
No comments
Tuesday, 10 November
Radiation thermo-chemical models of protoplanetary disks II. Line
diagnostics
http://www.arxiv.org/abs/0911.1949
I. Kamp,
I. Tilling,
P. Woitke,
W.-F. Thi,
M. Hogerheijde
accepted for publication in A&A
Methods.
(more)
10 11 09 - 22:21 |
No comments
Solar-Terrestrial Simulations of CMEs with a Realistic Initiation
Mechanism: Case Study for Active Region 10069
http://www.arxiv.org/abs/0911.1895
N. Lugaz,
I. I. Roussev,
I. V. Sokolov,
C. Jacobs
4 pages, 2 figures, refereed proceedings for Solar Wind 12
Most simulations of coronal mass ejections (CMEs) to date either focus on the
interplanetary propagation of a giant plasma "blob" without paying too much
attention to its origin and to the formation process or they focus on the
complex evolution of the coronal magnetic field due to (sub-)photospheric
motions which result in an eruption.
(more)
10 11 09 - 22:20 |
No comments
Exploring the $P_{cyc}$ vs $P_{rot}$ relation with flux transport dynamo
models of solar-like stars
http://www.arxiv.org/abs/0911.1947
L. Jouve (1,2),
B.P. Brown (3),
A.S. Brun (1,3)
12 pages, 8 figures, accepted for publication by A&A 1: AIM, CEA/DSM-CNRS-Univ. Paris 7, IRFU/SAp, France, 2: D.A.M.T.P., Centre for Mathematical Sciences, Univ. of Cambridge, UK, 3: JILA and Department of Astrophysical and Planetary Sciences, Univ. of Colorado, USA
Aims: To understand stellar magnetism and to test the validity of the
Babcock-Leighton flux transport mean field dynamo models with stellar activity
observations Methods: 2-D mean field dynamo models at various rotation rates
are computed with the STELEM code to study the sensitivity of the activity
cycle period and butterfly diagram to parameter changes and are compared to
observational data.
(more)
10 11 09 - 22:20 |
No comments
Virtual Observatory: Science capabilities and scientific results
http://www.arxiv.org/abs/0911.1878
Evanthia Hatziminaoglou (ESO, Garching)
10 pages, 5 figures, invited talk, proceedings of the 9th Hellenic Astronomical Society Conference, Athens, 20-24 September 2009
The virtual observatory (VO) is a collection of interoperable data archives,
tools and applications that together form an environment in which original
astronomical research can be carried out.
(more)
10 11 09 - 22:19 |
No comments
Revisiting 2D Numerical Models for the 19th century outbursts of $\eta$
Carinae
http://www.arxiv.org/abs/0911.1808
R.F. González,
A.M. Villa,
G.C. Gómez,
E.M. de Gouveia Dal Pino,
A.C. Raga,
J. Cantó,
P.F. Velázquez,
E. de la Fuente
accepted for publication in MNRAS
We present here new results of two-dimensional hydrodynamical simulations of
the eruptive events of the 1840s (the great) and the 1890s (the minor)
eruptions suffered by the massive star $\eta$ Car.
(more)
10 11 09 - 22:19 |
No comments
Structure, Kinematics, and Chemical Enrichment Patterns after Major
Gas-Rich Disc-Disc Mergers
http://www.arxiv.org/abs/0911.1801
Simon Richard,
Chris B. Brook,
Hugo Martel,
Daisuke Kawata,
Brad K. Gibson,
Patricia Sanchez-Blazquez
17 pages, 20 figures, to be published in MNRAS
We used an N-body smoothed particle hydrodynamics algorithm, with a detailed
treatment of star formation, supernovae feedback, and chemical enrichment, to
perform eight simulations of mergers between gas-rich disc galaxies.
(more)
10 11 09 - 22:18 |
No comments
Dependence of the Star Formation Efficiency on the Parameters of
Molecular Cloud Formation Simulations
http://www.arxiv.org/abs/0911.1795
Yetli Rosas-Guevara,
Enrique Vazquez-Semadeni,
Gilberto C. Gomez,
A.-Katharina Jappsen
19 pages, submitted to MNRAS
We investigate the response of the star formation efficiency (SFE) to the
main parameters of simulations of molecular cloud formation by the collision of
warm diffuse medium (WNM) cylindrical streams, neglecting stellar feedback and
magnetic fields.
(more)
10 11 09 - 22:17 |
No comments
Chemical Evolution in Hierarchical Models of Cosmic Structure II: The
Formation of the Milky Way Stellar Halo and the Distribution of the Oldest
Stars
http://www.arxiv.org/abs/0911.1786
Jason Tumlinson (STScI)
Submitted to ApJ, 22 pages emulateapj, 15 color figures
This paper presents theoretical star formation and chemical enrichment
histories for the stellar halo of the Milky Way based on new chemodynamical
modeling.
(more)
10 11 09 - 22:15 |
No comments
Computing the Bayesian Evidence from a Markov Chain Monte Carlo
Simulation of the Posterior Distribution
http://www.arxiv.org/abs/0911.1777
Martin D. Weinberg
22 pages, 6 figures, submitted to Bayesian Analysis
Computation of the marginal likelihood or "Bayesian Evidence" from a
simulated posterior distribution is central to Bayesian model selection but is
fraught with difficulty.
(more)
10 11 09 - 22:15 |
No comments
Monday, 09 November
A Simultaneous Stacking and Deblending Algorithm for Astronomical Images
http://www.arxiv.org/abs/0911.1592
Peter Kurczynski,
Eric Gawiser
submitted to The Astronomical Journal. 18 pages, 6 figures
Stacking analysis is a means of detecting faint sources using a priori
position information to estimate an aggregate signal from individually
undetected objects.
(more)
09 11 09 - 23:39 |
No comments
Gas Accretion from a Circumbinary Disk
http://www.arxiv.org/abs/0911.2032Tomoyuki Hanawa, Yasuhiro Ochi, Koichi Ando
41 pages, 25 PostScript figures, uses AASTeX, to appear in ApJ
A new computational scheme is developed to study gas accretion from a circumbinary disk.
(more)
12 11 09 - 22:35 |
No comments
Fast and Large Volume Simulations of the 21 cm Signal from the
Reionization and pre-Reionization Epochs
http://www.arxiv.org/abs/0911.2219
M. G. Santos (1),
L. Ferramacho (1),
M. B. Silva (1),
A. Amblard (2),
A. Cooray (2) ((1) CENTRA - IST, (2) UC Irvine)
14 pages and 15 figures
While limited to low spatial resolution, the next generation low-frequency
radio interferometers that target 21 cm observations during the era of
reionization and prior will have instantaneous fields-of-view that are many
tens of square degrees on the sky.
(more)
12 11 09 - 22:32 |
No comments
Tuesday, 10 November
Radiation thermo-chemical models of protoplanetary disks II. Line
diagnostics
http://www.arxiv.org/abs/0911.1949
I. Kamp,
I. Tilling,
P. Woitke,
W.-F. Thi,
M. Hogerheijde
accepted for publication in A&A
Methods.
(more)
10 11 09 - 22:21 |
No comments
Solar-Terrestrial Simulations of CMEs with a Realistic Initiation
Mechanism: Case Study for Active Region 10069
http://www.arxiv.org/abs/0911.1895
N. Lugaz,
I. I. Roussev,
I. V. Sokolov,
C. Jacobs
4 pages, 2 figures, refereed proceedings for Solar Wind 12
Most simulations of coronal mass ejections (CMEs) to date either focus on the
interplanetary propagation of a giant plasma "blob" without paying too much
attention to its origin and to the formation process or they focus on the
complex evolution of the coronal magnetic field due to (sub-)photospheric
motions which result in an eruption.
(more)
10 11 09 - 22:20 |
No comments
Exploring the $P_{cyc}$ vs $P_{rot}$ relation with flux transport dynamo
models of solar-like stars
http://www.arxiv.org/abs/0911.1947
L. Jouve (1,2),
B.P. Brown (3),
A.S. Brun (1,3)
12 pages, 8 figures, accepted for publication by A&A 1: AIM, CEA/DSM-CNRS-Univ. Paris 7, IRFU/SAp, France, 2: D.A.M.T.P., Centre for Mathematical Sciences, Univ. of Cambridge, UK, 3: JILA and Department of Astrophysical and Planetary Sciences, Univ. of Colorado, USA
Aims: To understand stellar magnetism and to test the validity of the
Babcock-Leighton flux transport mean field dynamo models with stellar activity
observations Methods: 2-D mean field dynamo models at various rotation rates
are computed with the STELEM code to study the sensitivity of the activity
cycle period and butterfly diagram to parameter changes and are compared to
observational data.
(more)
10 11 09 - 22:20 |
No comments
Virtual Observatory: Science capabilities and scientific results
http://www.arxiv.org/abs/0911.1878
Evanthia Hatziminaoglou (ESO, Garching)
10 pages, 5 figures, invited talk, proceedings of the 9th Hellenic Astronomical Society Conference, Athens, 20-24 September 2009
The virtual observatory (VO) is a collection of interoperable data archives,
tools and applications that together form an environment in which original
astronomical research can be carried out.
(more)
10 11 09 - 22:19 |
No comments
Revisiting 2D Numerical Models for the 19th century outbursts of $\eta$
Carinae
http://www.arxiv.org/abs/0911.1808
R.F. González,
A.M. Villa,
G.C. Gómez,
E.M. de Gouveia Dal Pino,
A.C. Raga,
J. Cantó,
P.F. Velázquez,
E. de la Fuente
accepted for publication in MNRAS
We present here new results of two-dimensional hydrodynamical simulations of
the eruptive events of the 1840s (the great) and the 1890s (the minor)
eruptions suffered by the massive star $\eta$ Car.
(more)
10 11 09 - 22:19 |
No comments
Structure, Kinematics, and Chemical Enrichment Patterns after Major
Gas-Rich Disc-Disc Mergers
http://www.arxiv.org/abs/0911.1801
Simon Richard,
Chris B. Brook,
Hugo Martel,
Daisuke Kawata,
Brad K. Gibson,
Patricia Sanchez-Blazquez
17 pages, 20 figures, to be published in MNRAS
We used an N-body smoothed particle hydrodynamics algorithm, with a detailed
treatment of star formation, supernovae feedback, and chemical enrichment, to
perform eight simulations of mergers between gas-rich disc galaxies.
(more)
10 11 09 - 22:18 |
No comments
Dependence of the Star Formation Efficiency on the Parameters of
Molecular Cloud Formation Simulations
http://www.arxiv.org/abs/0911.1795
Yetli Rosas-Guevara,
Enrique Vazquez-Semadeni,
Gilberto C. Gomez,
A.-Katharina Jappsen
19 pages, submitted to MNRAS
We investigate the response of the star formation efficiency (SFE) to the
main parameters of simulations of molecular cloud formation by the collision of
warm diffuse medium (WNM) cylindrical streams, neglecting stellar feedback and
magnetic fields.
(more)
10 11 09 - 22:17 |
No comments
Chemical Evolution in Hierarchical Models of Cosmic Structure II: The
Formation of the Milky Way Stellar Halo and the Distribution of the Oldest
Stars
http://www.arxiv.org/abs/0911.1786
Jason Tumlinson (STScI)
Submitted to ApJ, 22 pages emulateapj, 15 color figures
This paper presents theoretical star formation and chemical enrichment
histories for the stellar halo of the Milky Way based on new chemodynamical
modeling.
(more)
10 11 09 - 22:15 |
No comments
Computing the Bayesian Evidence from a Markov Chain Monte Carlo
Simulation of the Posterior Distribution
http://www.arxiv.org/abs/0911.1777
Martin D. Weinberg
22 pages, 6 figures, submitted to Bayesian Analysis
Computation of the marginal likelihood or "Bayesian Evidence" from a
simulated posterior distribution is central to Bayesian model selection but is
fraught with difficulty.
(more)
10 11 09 - 22:15 |
No comments
Monday, 09 November
A Simultaneous Stacking and Deblending Algorithm for Astronomical Images
http://www.arxiv.org/abs/0911.1592
Peter Kurczynski,
Eric Gawiser
submitted to The Astronomical Journal. 18 pages, 6 figures
Stacking analysis is a means of detecting faint sources using a priori
position information to estimate an aggregate signal from individually
undetected objects.
(more)
09 11 09 - 23:39 |
No comments
Fast and Large Volume Simulations of the 21 cm Signal from the Reionization and pre-Reionization Epochs
http://www.arxiv.org/abs/0911.2219M. G. Santos (1), L. Ferramacho (1), M. B. Silva (1), A. Amblard (2), A. Cooray (2) ((1) CENTRA - IST, (2) UC Irvine)
14 pages and 15 figures
While limited to low spatial resolution, the next generation low-frequency radio interferometers that target 21 cm observations during the era of reionization and prior will have instantaneous fields-of-view that are many tens of square degrees on the sky.
(more)
12 11 09 - 22:32 |
No comments
Tuesday, 10 November
Radiation thermo-chemical models of protoplanetary disks II. Line
diagnostics
http://www.arxiv.org/abs/0911.1949
I. Kamp,
I. Tilling,
P. Woitke,
W.-F. Thi,
M. Hogerheijde
accepted for publication in A&A
Methods.
(more)
10 11 09 - 22:21 |
No comments
Solar-Terrestrial Simulations of CMEs with a Realistic Initiation
Mechanism: Case Study for Active Region 10069
http://www.arxiv.org/abs/0911.1895
N. Lugaz,
I. I. Roussev,
I. V. Sokolov,
C. Jacobs
4 pages, 2 figures, refereed proceedings for Solar Wind 12
Most simulations of coronal mass ejections (CMEs) to date either focus on the
interplanetary propagation of a giant plasma "blob" without paying too much
attention to its origin and to the formation process or they focus on the
complex evolution of the coronal magnetic field due to (sub-)photospheric
motions which result in an eruption.
(more)
10 11 09 - 22:20 |
No comments
Exploring the $P_{cyc}$ vs $P_{rot}$ relation with flux transport dynamo
models of solar-like stars
http://www.arxiv.org/abs/0911.1947
L. Jouve (1,2),
B.P. Brown (3),
A.S. Brun (1,3)
12 pages, 8 figures, accepted for publication by A&A 1: AIM, CEA/DSM-CNRS-Univ. Paris 7, IRFU/SAp, France, 2: D.A.M.T.P., Centre for Mathematical Sciences, Univ. of Cambridge, UK, 3: JILA and Department of Astrophysical and Planetary Sciences, Univ. of Colorado, USA
Aims: To understand stellar magnetism and to test the validity of the
Babcock-Leighton flux transport mean field dynamo models with stellar activity
observations Methods: 2-D mean field dynamo models at various rotation rates
are computed with the STELEM code to study the sensitivity of the activity
cycle period and butterfly diagram to parameter changes and are compared to
observational data.
(more)
10 11 09 - 22:20 |
No comments
Virtual Observatory: Science capabilities and scientific results
http://www.arxiv.org/abs/0911.1878
Evanthia Hatziminaoglou (ESO, Garching)
10 pages, 5 figures, invited talk, proceedings of the 9th Hellenic Astronomical Society Conference, Athens, 20-24 September 2009
The virtual observatory (VO) is a collection of interoperable data archives,
tools and applications that together form an environment in which original
astronomical research can be carried out.
(more)
10 11 09 - 22:19 |
No comments
Revisiting 2D Numerical Models for the 19th century outbursts of $\eta$
Carinae
http://www.arxiv.org/abs/0911.1808
R.F. González,
A.M. Villa,
G.C. Gómez,
E.M. de Gouveia Dal Pino,
A.C. Raga,
J. Cantó,
P.F. Velázquez,
E. de la Fuente
accepted for publication in MNRAS
We present here new results of two-dimensional hydrodynamical simulations of
the eruptive events of the 1840s (the great) and the 1890s (the minor)
eruptions suffered by the massive star $\eta$ Car.
(more)
10 11 09 - 22:19 |
No comments
Structure, Kinematics, and Chemical Enrichment Patterns after Major
Gas-Rich Disc-Disc Mergers
http://www.arxiv.org/abs/0911.1801
Simon Richard,
Chris B. Brook,
Hugo Martel,
Daisuke Kawata,
Brad K. Gibson,
Patricia Sanchez-Blazquez
17 pages, 20 figures, to be published in MNRAS
We used an N-body smoothed particle hydrodynamics algorithm, with a detailed
treatment of star formation, supernovae feedback, and chemical enrichment, to
perform eight simulations of mergers between gas-rich disc galaxies.
(more)
10 11 09 - 22:18 |
No comments
Dependence of the Star Formation Efficiency on the Parameters of
Molecular Cloud Formation Simulations
http://www.arxiv.org/abs/0911.1795
Yetli Rosas-Guevara,
Enrique Vazquez-Semadeni,
Gilberto C. Gomez,
A.-Katharina Jappsen
19 pages, submitted to MNRAS
We investigate the response of the star formation efficiency (SFE) to the
main parameters of simulations of molecular cloud formation by the collision of
warm diffuse medium (WNM) cylindrical streams, neglecting stellar feedback and
magnetic fields.
(more)
10 11 09 - 22:17 |
No comments
Chemical Evolution in Hierarchical Models of Cosmic Structure II: The
Formation of the Milky Way Stellar Halo and the Distribution of the Oldest
Stars
http://www.arxiv.org/abs/0911.1786
Jason Tumlinson (STScI)
Submitted to ApJ, 22 pages emulateapj, 15 color figures
This paper presents theoretical star formation and chemical enrichment
histories for the stellar halo of the Milky Way based on new chemodynamical
modeling.
(more)
10 11 09 - 22:15 |
No comments
Computing the Bayesian Evidence from a Markov Chain Monte Carlo
Simulation of the Posterior Distribution
http://www.arxiv.org/abs/0911.1777
Martin D. Weinberg
22 pages, 6 figures, submitted to Bayesian Analysis
Computation of the marginal likelihood or "Bayesian Evidence" from a
simulated posterior distribution is central to Bayesian model selection but is
fraught with difficulty.
(more)
10 11 09 - 22:15 |
No comments
Monday, 09 November
A Simultaneous Stacking and Deblending Algorithm for Astronomical Images
http://www.arxiv.org/abs/0911.1592
Peter Kurczynski,
Eric Gawiser
submitted to The Astronomical Journal. 18 pages, 6 figures
Stacking analysis is a means of detecting faint sources using a priori
position information to estimate an aggregate signal from individually
undetected objects.
(more)
09 11 09 - 23:39 |
No comments
Radiation thermo-chemical models of protoplanetary disks II. Line diagnostics
http://www.arxiv.org/abs/0911.1949I. Kamp, I. Tilling, P. Woitke, W.-F. Thi, M. Hogerheijde
accepted for publication in A&A
Methods.
(more)
10 11 09 - 22:21 |
No comments
Solar-Terrestrial Simulations of CMEs with a Realistic Initiation
Mechanism: Case Study for Active Region 10069
http://www.arxiv.org/abs/0911.1895
N. Lugaz,
I. I. Roussev,
I. V. Sokolov,
C. Jacobs
4 pages, 2 figures, refereed proceedings for Solar Wind 12
Most simulations of coronal mass ejections (CMEs) to date either focus on the
interplanetary propagation of a giant plasma "blob" without paying too much
attention to its origin and to the formation process or they focus on the
complex evolution of the coronal magnetic field due to (sub-)photospheric
motions which result in an eruption.
(more)
10 11 09 - 22:20 |
No comments
Exploring the $P_{cyc}$ vs $P_{rot}$ relation with flux transport dynamo
models of solar-like stars
http://www.arxiv.org/abs/0911.1947
L. Jouve (1,2),
B.P. Brown (3),
A.S. Brun (1,3)
12 pages, 8 figures, accepted for publication by A&A 1: AIM, CEA/DSM-CNRS-Univ. Paris 7, IRFU/SAp, France, 2: D.A.M.T.P., Centre for Mathematical Sciences, Univ. of Cambridge, UK, 3: JILA and Department of Astrophysical and Planetary Sciences, Univ. of Colorado, USA
Aims: To understand stellar magnetism and to test the validity of the
Babcock-Leighton flux transport mean field dynamo models with stellar activity
observations Methods: 2-D mean field dynamo models at various rotation rates
are computed with the STELEM code to study the sensitivity of the activity
cycle period and butterfly diagram to parameter changes and are compared to
observational data.
(more)
10 11 09 - 22:20 |
No comments
Virtual Observatory: Science capabilities and scientific results
http://www.arxiv.org/abs/0911.1878
Evanthia Hatziminaoglou (ESO, Garching)
10 pages, 5 figures, invited talk, proceedings of the 9th Hellenic Astronomical Society Conference, Athens, 20-24 September 2009
The virtual observatory (VO) is a collection of interoperable data archives,
tools and applications that together form an environment in which original
astronomical research can be carried out.
(more)
10 11 09 - 22:19 |
No comments
Revisiting 2D Numerical Models for the 19th century outbursts of $\eta$
Carinae
http://www.arxiv.org/abs/0911.1808
R.F. González,
A.M. Villa,
G.C. Gómez,
E.M. de Gouveia Dal Pino,
A.C. Raga,
J. Cantó,
P.F. Velázquez,
E. de la Fuente
accepted for publication in MNRAS
We present here new results of two-dimensional hydrodynamical simulations of
the eruptive events of the 1840s (the great) and the 1890s (the minor)
eruptions suffered by the massive star $\eta$ Car.
(more)
10 11 09 - 22:19 |
No comments
Structure, Kinematics, and Chemical Enrichment Patterns after Major
Gas-Rich Disc-Disc Mergers
http://www.arxiv.org/abs/0911.1801
Simon Richard,
Chris B. Brook,
Hugo Martel,
Daisuke Kawata,
Brad K. Gibson,
Patricia Sanchez-Blazquez
17 pages, 20 figures, to be published in MNRAS
We used an N-body smoothed particle hydrodynamics algorithm, with a detailed
treatment of star formation, supernovae feedback, and chemical enrichment, to
perform eight simulations of mergers between gas-rich disc galaxies.
(more)
10 11 09 - 22:18 |
No comments
Dependence of the Star Formation Efficiency on the Parameters of
Molecular Cloud Formation Simulations
http://www.arxiv.org/abs/0911.1795
Yetli Rosas-Guevara,
Enrique Vazquez-Semadeni,
Gilberto C. Gomez,
A.-Katharina Jappsen
19 pages, submitted to MNRAS
We investigate the response of the star formation efficiency (SFE) to the
main parameters of simulations of molecular cloud formation by the collision of
warm diffuse medium (WNM) cylindrical streams, neglecting stellar feedback and
magnetic fields.
(more)
10 11 09 - 22:17 |
No comments
Chemical Evolution in Hierarchical Models of Cosmic Structure II: The
Formation of the Milky Way Stellar Halo and the Distribution of the Oldest
Stars
http://www.arxiv.org/abs/0911.1786
Jason Tumlinson (STScI)
Submitted to ApJ, 22 pages emulateapj, 15 color figures
This paper presents theoretical star formation and chemical enrichment
histories for the stellar halo of the Milky Way based on new chemodynamical
modeling.
(more)
10 11 09 - 22:15 |
No comments
Computing the Bayesian Evidence from a Markov Chain Monte Carlo
Simulation of the Posterior Distribution
http://www.arxiv.org/abs/0911.1777
Martin D. Weinberg
22 pages, 6 figures, submitted to Bayesian Analysis
Computation of the marginal likelihood or "Bayesian Evidence" from a
simulated posterior distribution is central to Bayesian model selection but is
fraught with difficulty.
(more)
10 11 09 - 22:15 |
No comments
Monday, 09 November
A Simultaneous Stacking and Deblending Algorithm for Astronomical Images
http://www.arxiv.org/abs/0911.1592
Peter Kurczynski,
Eric Gawiser
submitted to The Astronomical Journal. 18 pages, 6 figures
Stacking analysis is a means of detecting faint sources using a priori
position information to estimate an aggregate signal from individually
undetected objects.
(more)
09 11 09 - 23:39 |
No comments
Solar-Terrestrial Simulations of CMEs with a Realistic Initiation Mechanism: Case Study for Active Region 10069
http://www.arxiv.org/abs/0911.1895N. Lugaz, I. I. Roussev, I. V. Sokolov, C. Jacobs
4 pages, 2 figures, refereed proceedings for Solar Wind 12
Most simulations of coronal mass ejections (CMEs) to date either focus on the interplanetary propagation of a giant plasma "blob" without paying too much attention to its origin and to the formation process or they focus on the complex evolution of the coronal magnetic field due to (sub-)photospheric motions which result in an eruption.
(more)
10 11 09 - 22:20 |
No comments
Exploring the $P_{cyc}$ vs $P_{rot}$ relation with flux transport dynamo
models of solar-like stars
http://www.arxiv.org/abs/0911.1947
L. Jouve (1,2),
B.P. Brown (3),
A.S. Brun (1,3)
12 pages, 8 figures, accepted for publication by A&A 1: AIM, CEA/DSM-CNRS-Univ. Paris 7, IRFU/SAp, France, 2: D.A.M.T.P., Centre for Mathematical Sciences, Univ. of Cambridge, UK, 3: JILA and Department of Astrophysical and Planetary Sciences, Univ. of Colorado, USA
Aims: To understand stellar magnetism and to test the validity of the
Babcock-Leighton flux transport mean field dynamo models with stellar activity
observations Methods: 2-D mean field dynamo models at various rotation rates
are computed with the STELEM code to study the sensitivity of the activity
cycle period and butterfly diagram to parameter changes and are compared to
observational data.
(more)
10 11 09 - 22:20 |
No comments
Virtual Observatory: Science capabilities and scientific results
http://www.arxiv.org/abs/0911.1878
Evanthia Hatziminaoglou (ESO, Garching)
10 pages, 5 figures, invited talk, proceedings of the 9th Hellenic Astronomical Society Conference, Athens, 20-24 September 2009
The virtual observatory (VO) is a collection of interoperable data archives,
tools and applications that together form an environment in which original
astronomical research can be carried out.
(more)
10 11 09 - 22:19 |
No comments
Revisiting 2D Numerical Models for the 19th century outbursts of $\eta$
Carinae
http://www.arxiv.org/abs/0911.1808
R.F. González,
A.M. Villa,
G.C. Gómez,
E.M. de Gouveia Dal Pino,
A.C. Raga,
J. Cantó,
P.F. Velázquez,
E. de la Fuente
accepted for publication in MNRAS
We present here new results of two-dimensional hydrodynamical simulations of
the eruptive events of the 1840s (the great) and the 1890s (the minor)
eruptions suffered by the massive star $\eta$ Car.
(more)
10 11 09 - 22:19 |
No comments
Structure, Kinematics, and Chemical Enrichment Patterns after Major
Gas-Rich Disc-Disc Mergers
http://www.arxiv.org/abs/0911.1801
Simon Richard,
Chris B. Brook,
Hugo Martel,
Daisuke Kawata,
Brad K. Gibson,
Patricia Sanchez-Blazquez
17 pages, 20 figures, to be published in MNRAS
We used an N-body smoothed particle hydrodynamics algorithm, with a detailed
treatment of star formation, supernovae feedback, and chemical enrichment, to
perform eight simulations of mergers between gas-rich disc galaxies.
(more)
10 11 09 - 22:18 |
No comments
Dependence of the Star Formation Efficiency on the Parameters of
Molecular Cloud Formation Simulations
http://www.arxiv.org/abs/0911.1795
Yetli Rosas-Guevara,
Enrique Vazquez-Semadeni,
Gilberto C. Gomez,
A.-Katharina Jappsen
19 pages, submitted to MNRAS
We investigate the response of the star formation efficiency (SFE) to the
main parameters of simulations of molecular cloud formation by the collision of
warm diffuse medium (WNM) cylindrical streams, neglecting stellar feedback and
magnetic fields.
(more)
10 11 09 - 22:17 |
No comments
Chemical Evolution in Hierarchical Models of Cosmic Structure II: The
Formation of the Milky Way Stellar Halo and the Distribution of the Oldest
Stars
http://www.arxiv.org/abs/0911.1786
Jason Tumlinson (STScI)
Submitted to ApJ, 22 pages emulateapj, 15 color figures
This paper presents theoretical star formation and chemical enrichment
histories for the stellar halo of the Milky Way based on new chemodynamical
modeling.
(more)
10 11 09 - 22:15 |
No comments
Computing the Bayesian Evidence from a Markov Chain Monte Carlo
Simulation of the Posterior Distribution
http://www.arxiv.org/abs/0911.1777
Martin D. Weinberg
22 pages, 6 figures, submitted to Bayesian Analysis
Computation of the marginal likelihood or "Bayesian Evidence" from a
simulated posterior distribution is central to Bayesian model selection but is
fraught with difficulty.
(more)
10 11 09 - 22:15 |
No comments
Monday, 09 November
A Simultaneous Stacking and Deblending Algorithm for Astronomical Images
http://www.arxiv.org/abs/0911.1592
Peter Kurczynski,
Eric Gawiser
submitted to The Astronomical Journal. 18 pages, 6 figures
Stacking analysis is a means of detecting faint sources using a priori
position information to estimate an aggregate signal from individually
undetected objects.
(more)
09 11 09 - 23:39 |
No comments
Exploring the $P_{cyc}$ vs $P_{rot}$ relation with flux transport dynamo models of solar-like stars
http://www.arxiv.org/abs/0911.1947L. Jouve (1,2), B.P. Brown (3), A.S. Brun (1,3)
12 pages, 8 figures, accepted for publication by A&A 1: AIM, CEA/DSM-CNRS-Univ. Paris 7, IRFU/SAp, France, 2: D.A.M.T.P., Centre for Mathematical Sciences, Univ. of Cambridge, UK, 3: JILA and Department of Astrophysical and Planetary Sciences, Univ. of Colorado, USA
Aims: To understand stellar magnetism and to test the validity of the Babcock-Leighton flux transport mean field dynamo models with stellar activity observations Methods: 2-D mean field dynamo models at various rotation rates are computed with the STELEM code to study the sensitivity of the activity cycle period and butterfly diagram to parameter changes and are compared to observational data.
(more)
10 11 09 - 22:20 |
No comments
Virtual Observatory: Science capabilities and scientific results
http://www.arxiv.org/abs/0911.1878
Evanthia Hatziminaoglou (ESO, Garching)
10 pages, 5 figures, invited talk, proceedings of the 9th Hellenic Astronomical Society Conference, Athens, 20-24 September 2009
The virtual observatory (VO) is a collection of interoperable data archives,
tools and applications that together form an environment in which original
astronomical research can be carried out.
(more)
10 11 09 - 22:19 |
No comments
Revisiting 2D Numerical Models for the 19th century outbursts of $\eta$
Carinae
http://www.arxiv.org/abs/0911.1808
R.F. González,
A.M. Villa,
G.C. Gómez,
E.M. de Gouveia Dal Pino,
A.C. Raga,
J. Cantó,
P.F. Velázquez,
E. de la Fuente
accepted for publication in MNRAS
We present here new results of two-dimensional hydrodynamical simulations of
the eruptive events of the 1840s (the great) and the 1890s (the minor)
eruptions suffered by the massive star $\eta$ Car.
(more)
10 11 09 - 22:19 |
No comments
Structure, Kinematics, and Chemical Enrichment Patterns after Major
Gas-Rich Disc-Disc Mergers
http://www.arxiv.org/abs/0911.1801
Simon Richard,
Chris B. Brook,
Hugo Martel,
Daisuke Kawata,
Brad K. Gibson,
Patricia Sanchez-Blazquez
17 pages, 20 figures, to be published in MNRAS
We used an N-body smoothed particle hydrodynamics algorithm, with a detailed
treatment of star formation, supernovae feedback, and chemical enrichment, to
perform eight simulations of mergers between gas-rich disc galaxies.
(more)
10 11 09 - 22:18 |
No comments
Dependence of the Star Formation Efficiency on the Parameters of
Molecular Cloud Formation Simulations
http://www.arxiv.org/abs/0911.1795
Yetli Rosas-Guevara,
Enrique Vazquez-Semadeni,
Gilberto C. Gomez,
A.-Katharina Jappsen
19 pages, submitted to MNRAS
We investigate the response of the star formation efficiency (SFE) to the
main parameters of simulations of molecular cloud formation by the collision of
warm diffuse medium (WNM) cylindrical streams, neglecting stellar feedback and
magnetic fields.
(more)
10 11 09 - 22:17 |
No comments
Chemical Evolution in Hierarchical Models of Cosmic Structure II: The
Formation of the Milky Way Stellar Halo and the Distribution of the Oldest
Stars
http://www.arxiv.org/abs/0911.1786
Jason Tumlinson (STScI)
Submitted to ApJ, 22 pages emulateapj, 15 color figures
This paper presents theoretical star formation and chemical enrichment
histories for the stellar halo of the Milky Way based on new chemodynamical
modeling.
(more)
10 11 09 - 22:15 |
No comments
Computing the Bayesian Evidence from a Markov Chain Monte Carlo
Simulation of the Posterior Distribution
http://www.arxiv.org/abs/0911.1777
Martin D. Weinberg
22 pages, 6 figures, submitted to Bayesian Analysis
Computation of the marginal likelihood or "Bayesian Evidence" from a
simulated posterior distribution is central to Bayesian model selection but is
fraught with difficulty.
(more)
10 11 09 - 22:15 |
No comments
Monday, 09 November
A Simultaneous Stacking and Deblending Algorithm for Astronomical Images
http://www.arxiv.org/abs/0911.1592
Peter Kurczynski,
Eric Gawiser
submitted to The Astronomical Journal. 18 pages, 6 figures
Stacking analysis is a means of detecting faint sources using a priori
position information to estimate an aggregate signal from individually
undetected objects.
(more)
09 11 09 - 23:39 |
No comments
Virtual Observatory: Science capabilities and scientific results
http://www.arxiv.org/abs/0911.1878Evanthia Hatziminaoglou (ESO, Garching)
10 pages, 5 figures, invited talk, proceedings of the 9th Hellenic Astronomical Society Conference, Athens, 20-24 September 2009
The virtual observatory (VO) is a collection of interoperable data archives, tools and applications that together form an environment in which original astronomical research can be carried out.
(more)
10 11 09 - 22:19 |
No comments
Revisiting 2D Numerical Models for the 19th century outbursts of $\eta$
Carinae
http://www.arxiv.org/abs/0911.1808
R.F. González,
A.M. Villa,
G.C. Gómez,
E.M. de Gouveia Dal Pino,
A.C. Raga,
J. Cantó,
P.F. Velázquez,
E. de la Fuente
accepted for publication in MNRAS
We present here new results of two-dimensional hydrodynamical simulations of
the eruptive events of the 1840s (the great) and the 1890s (the minor)
eruptions suffered by the massive star $\eta$ Car.
(more)
10 11 09 - 22:19 |
No comments
Structure, Kinematics, and Chemical Enrichment Patterns after Major
Gas-Rich Disc-Disc Mergers
http://www.arxiv.org/abs/0911.1801
Simon Richard,
Chris B. Brook,
Hugo Martel,
Daisuke Kawata,
Brad K. Gibson,
Patricia Sanchez-Blazquez
17 pages, 20 figures, to be published in MNRAS
We used an N-body smoothed particle hydrodynamics algorithm, with a detailed
treatment of star formation, supernovae feedback, and chemical enrichment, to
perform eight simulations of mergers between gas-rich disc galaxies.
(more)
10 11 09 - 22:18 |
No comments
Dependence of the Star Formation Efficiency on the Parameters of
Molecular Cloud Formation Simulations
http://www.arxiv.org/abs/0911.1795
Yetli Rosas-Guevara,
Enrique Vazquez-Semadeni,
Gilberto C. Gomez,
A.-Katharina Jappsen
19 pages, submitted to MNRAS
We investigate the response of the star formation efficiency (SFE) to the
main parameters of simulations of molecular cloud formation by the collision of
warm diffuse medium (WNM) cylindrical streams, neglecting stellar feedback and
magnetic fields.
(more)
10 11 09 - 22:17 |
No comments
Chemical Evolution in Hierarchical Models of Cosmic Structure II: The
Formation of the Milky Way Stellar Halo and the Distribution of the Oldest
Stars
http://www.arxiv.org/abs/0911.1786
Jason Tumlinson (STScI)
Submitted to ApJ, 22 pages emulateapj, 15 color figures
This paper presents theoretical star formation and chemical enrichment
histories for the stellar halo of the Milky Way based on new chemodynamical
modeling.
(more)
10 11 09 - 22:15 |
No comments
Computing the Bayesian Evidence from a Markov Chain Monte Carlo
Simulation of the Posterior Distribution
http://www.arxiv.org/abs/0911.1777
Martin D. Weinberg
22 pages, 6 figures, submitted to Bayesian Analysis
Computation of the marginal likelihood or "Bayesian Evidence" from a
simulated posterior distribution is central to Bayesian model selection but is
fraught with difficulty.
(more)
10 11 09 - 22:15 |
No comments
Monday, 09 November
A Simultaneous Stacking and Deblending Algorithm for Astronomical Images
http://www.arxiv.org/abs/0911.1592
Peter Kurczynski,
Eric Gawiser
submitted to The Astronomical Journal. 18 pages, 6 figures
Stacking analysis is a means of detecting faint sources using a priori
position information to estimate an aggregate signal from individually
undetected objects.
(more)
09 11 09 - 23:39 |
No comments
Revisiting 2D Numerical Models for the 19th century outbursts of $\eta$ Carinae
http://www.arxiv.org/abs/0911.1808R.F. González, A.M. Villa, G.C. Gómez, E.M. de Gouveia Dal Pino, A.C. Raga, J. Cantó, P.F. Velázquez, E. de la Fuente
accepted for publication in MNRAS
We present here new results of two-dimensional hydrodynamical simulations of the eruptive events of the 1840s (the great) and the 1890s (the minor) eruptions suffered by the massive star $\eta$ Car.
(more)
10 11 09 - 22:19 |
No comments
Structure, Kinematics, and Chemical Enrichment Patterns after Major
Gas-Rich Disc-Disc Mergers
http://www.arxiv.org/abs/0911.1801
Simon Richard,
Chris B. Brook,
Hugo Martel,
Daisuke Kawata,
Brad K. Gibson,
Patricia Sanchez-Blazquez
17 pages, 20 figures, to be published in MNRAS
We used an N-body smoothed particle hydrodynamics algorithm, with a detailed
treatment of star formation, supernovae feedback, and chemical enrichment, to
perform eight simulations of mergers between gas-rich disc galaxies.
(more)
10 11 09 - 22:18 |
No comments
Dependence of the Star Formation Efficiency on the Parameters of
Molecular Cloud Formation Simulations
http://www.arxiv.org/abs/0911.1795
Yetli Rosas-Guevara,
Enrique Vazquez-Semadeni,
Gilberto C. Gomez,
A.-Katharina Jappsen
19 pages, submitted to MNRAS
We investigate the response of the star formation efficiency (SFE) to the
main parameters of simulations of molecular cloud formation by the collision of
warm diffuse medium (WNM) cylindrical streams, neglecting stellar feedback and
magnetic fields.
(more)
10 11 09 - 22:17 |
No comments
Chemical Evolution in Hierarchical Models of Cosmic Structure II: The
Formation of the Milky Way Stellar Halo and the Distribution of the Oldest
Stars
http://www.arxiv.org/abs/0911.1786
Jason Tumlinson (STScI)
Submitted to ApJ, 22 pages emulateapj, 15 color figures
This paper presents theoretical star formation and chemical enrichment
histories for the stellar halo of the Milky Way based on new chemodynamical
modeling.
(more)
10 11 09 - 22:15 |
No comments
Computing the Bayesian Evidence from a Markov Chain Monte Carlo
Simulation of the Posterior Distribution
http://www.arxiv.org/abs/0911.1777
Martin D. Weinberg
22 pages, 6 figures, submitted to Bayesian Analysis
Computation of the marginal likelihood or "Bayesian Evidence" from a
simulated posterior distribution is central to Bayesian model selection but is
fraught with difficulty.
(more)
10 11 09 - 22:15 |
No comments
Monday, 09 November
A Simultaneous Stacking and Deblending Algorithm for Astronomical Images
http://www.arxiv.org/abs/0911.1592
Peter Kurczynski,
Eric Gawiser
submitted to The Astronomical Journal. 18 pages, 6 figures
Stacking analysis is a means of detecting faint sources using a priori
position information to estimate an aggregate signal from individually
undetected objects.
(more)
09 11 09 - 23:39 |
No comments
Structure, Kinematics, and Chemical Enrichment Patterns after Major Gas-Rich Disc-Disc Mergers
http://www.arxiv.org/abs/0911.1801Simon Richard, Chris B. Brook, Hugo Martel, Daisuke Kawata, Brad K. Gibson, Patricia Sanchez-Blazquez
17 pages, 20 figures, to be published in MNRAS
We used an N-body smoothed particle hydrodynamics algorithm, with a detailed treatment of star formation, supernovae feedback, and chemical enrichment, to perform eight simulations of mergers between gas-rich disc galaxies.
(more)
10 11 09 - 22:18 |
No comments
Dependence of the Star Formation Efficiency on the Parameters of
Molecular Cloud Formation Simulations
http://www.arxiv.org/abs/0911.1795
Yetli Rosas-Guevara,
Enrique Vazquez-Semadeni,
Gilberto C. Gomez,
A.-Katharina Jappsen
19 pages, submitted to MNRAS
We investigate the response of the star formation efficiency (SFE) to the
main parameters of simulations of molecular cloud formation by the collision of
warm diffuse medium (WNM) cylindrical streams, neglecting stellar feedback and
magnetic fields.
(more)
10 11 09 - 22:17 |
No comments
Chemical Evolution in Hierarchical Models of Cosmic Structure II: The
Formation of the Milky Way Stellar Halo and the Distribution of the Oldest
Stars
http://www.arxiv.org/abs/0911.1786
Jason Tumlinson (STScI)
Submitted to ApJ, 22 pages emulateapj, 15 color figures
This paper presents theoretical star formation and chemical enrichment
histories for the stellar halo of the Milky Way based on new chemodynamical
modeling.
(more)
10 11 09 - 22:15 |
No comments
Computing the Bayesian Evidence from a Markov Chain Monte Carlo
Simulation of the Posterior Distribution
http://www.arxiv.org/abs/0911.1777
Martin D. Weinberg
22 pages, 6 figures, submitted to Bayesian Analysis
Computation of the marginal likelihood or "Bayesian Evidence" from a
simulated posterior distribution is central to Bayesian model selection but is
fraught with difficulty.
(more)
10 11 09 - 22:15 |
No comments
Monday, 09 November
A Simultaneous Stacking and Deblending Algorithm for Astronomical Images
http://www.arxiv.org/abs/0911.1592
Peter Kurczynski,
Eric Gawiser
submitted to The Astronomical Journal. 18 pages, 6 figures
Stacking analysis is a means of detecting faint sources using a priori
position information to estimate an aggregate signal from individually
undetected objects.
(more)
09 11 09 - 23:39 |
No comments
Dependence of the Star Formation Efficiency on the Parameters of Molecular Cloud Formation Simulations
http://www.arxiv.org/abs/0911.1795Yetli Rosas-Guevara, Enrique Vazquez-Semadeni, Gilberto C. Gomez, A.-Katharina Jappsen
19 pages, submitted to MNRAS
We investigate the response of the star formation efficiency (SFE) to the main parameters of simulations of molecular cloud formation by the collision of warm diffuse medium (WNM) cylindrical streams, neglecting stellar feedback and magnetic fields.
(more)
10 11 09 - 22:17 |
No comments
Chemical Evolution in Hierarchical Models of Cosmic Structure II: The
Formation of the Milky Way Stellar Halo and the Distribution of the Oldest
Stars
http://www.arxiv.org/abs/0911.1786
Jason Tumlinson (STScI)
Submitted to ApJ, 22 pages emulateapj, 15 color figures
This paper presents theoretical star formation and chemical enrichment
histories for the stellar halo of the Milky Way based on new chemodynamical
modeling.
(more)
10 11 09 - 22:15 |
No comments
Computing the Bayesian Evidence from a Markov Chain Monte Carlo
Simulation of the Posterior Distribution
http://www.arxiv.org/abs/0911.1777
Martin D. Weinberg
22 pages, 6 figures, submitted to Bayesian Analysis
Computation of the marginal likelihood or "Bayesian Evidence" from a
simulated posterior distribution is central to Bayesian model selection but is
fraught with difficulty.
(more)
10 11 09 - 22:15 |
No comments
Monday, 09 November
A Simultaneous Stacking and Deblending Algorithm for Astronomical Images
http://www.arxiv.org/abs/0911.1592
Peter Kurczynski,
Eric Gawiser
submitted to The Astronomical Journal. 18 pages, 6 figures
Stacking analysis is a means of detecting faint sources using a priori
position information to estimate an aggregate signal from individually
undetected objects.
(more)
09 11 09 - 23:39 |
No comments
Chemical Evolution in Hierarchical Models of Cosmic Structure II: The Formation of the Milky Way Stellar Halo and the Distribution of the Oldest Stars
http://www.arxiv.org/abs/0911.1786Jason Tumlinson (STScI)
Submitted to ApJ, 22 pages emulateapj, 15 color figures
This paper presents theoretical star formation and chemical enrichment histories for the stellar halo of the Milky Way based on new chemodynamical modeling.
(more)
10 11 09 - 22:15 |
No comments
Computing the Bayesian Evidence from a Markov Chain Monte Carlo
Simulation of the Posterior Distribution
http://www.arxiv.org/abs/0911.1777
Martin D. Weinberg
22 pages, 6 figures, submitted to Bayesian Analysis
Computation of the marginal likelihood or "Bayesian Evidence" from a
simulated posterior distribution is central to Bayesian model selection but is
fraught with difficulty.
(more)
10 11 09 - 22:15 |
No comments
Monday, 09 November
A Simultaneous Stacking and Deblending Algorithm for Astronomical Images
http://www.arxiv.org/abs/0911.1592
Peter Kurczynski,
Eric Gawiser
submitted to The Astronomical Journal. 18 pages, 6 figures
Stacking analysis is a means of detecting faint sources using a priori
position information to estimate an aggregate signal from individually
undetected objects.
(more)
09 11 09 - 23:39 |
No comments
Computing the Bayesian Evidence from a Markov Chain Monte Carlo Simulation of the Posterior Distribution
http://www.arxiv.org/abs/0911.1777Martin D. Weinberg
22 pages, 6 figures, submitted to Bayesian Analysis
Computation of the marginal likelihood or "Bayesian Evidence" from a simulated posterior distribution is central to Bayesian model selection but is fraught with difficulty.
(more)
10 11 09 - 22:15 |
No comments
Monday, 09 November
A Simultaneous Stacking and Deblending Algorithm for Astronomical Images
http://www.arxiv.org/abs/0911.1592
Peter Kurczynski,
Eric Gawiser
submitted to The Astronomical Journal. 18 pages, 6 figures
Stacking analysis is a means of detecting faint sources using a priori
position information to estimate an aggregate signal from individually
undetected objects.
(more)
09 11 09 - 23:39 |
No comments
A Simultaneous Stacking and Deblending Algorithm for Astronomical Images
http://www.arxiv.org/abs/0911.1592Peter Kurczynski, Eric Gawiser
submitted to The Astronomical Journal. 18 pages, 6 figures
Stacking analysis is a means of detecting faint sources using a priori position information to estimate an aggregate signal from individually undetected objects.
(more)
