Magnetohydrodynamic Turbulence as a Foreground for Cosmic Microwave Background Studies
J. Cho, A. Lazarian;
ApJ, 2002, 575, L63
ABSTRACT:Measurements of the intensity and polarization of diffuse Galactic synchrotron emission as well as starlight polarization reveal power-law spectra
of fluctuations.
We show that these fluctuations can arise from MHD
turbulence in the Galactic disk and halo.
To do so, we take into account the
converging geometry of lines of sight for the observations when the observer is
within the turbulent volume.
Assuming that the intensity of turbulence
changes along the line of sight, we get a reasonable fit to the observed
synchrotron data.
As for the spectra of polarized starlight, we get a good fit to the
observations taking into account the fact that the observational sample is biased
toward nearby stars.
KEYWORDS: cosmology: diffuse radiation, galaxy: structure, magnetohydrodynamics: mhd, turbulence
PERSOKEY:turbulence, SIMULATION, statistical analysis, SYNCHROTRON, component separation, polarisation, ,
CODE: cho2002a