Velocity and Density Spectra of the Small Magellanic Cloud
S. Stanimirovic, A. Lazarian;
ApJ, 2001, 551, L53
ABSTRACT:This Letter reports results on the statistical analysis of H I turbulence in the Small Magellanic Cloud (SMC).
We use 21 cm channel maps,
obtained with the Australia Telescope Compact Array and the Parkes telescope,
and analyze the spectrum of observed intensity fluctuations as a function
of the velocity slice thickness.
We confirm recent predictions by
Lazarian & Pogosyan on the change of the power-law index and establish the
spectra of three-dimensional density and velocity.
The obtained spectral
indices, -3.3 and -3.4, are slightly more shallow than the predictions for the
Kolmogorov spectrum.
This contrasts with the predictions for the shock-type
spectra that are steeper than the Kolmogorov one.
The nature of the energy
injection in the SMC is unclear, as no distinct energy injection scales are
observed up to the entire scale of the SMC.
KEYWORDS: galaxies: individual: name: small magellanic cloud, ism: general, ism: kinematics and dynamics, ism: structure, turbulence
PERSOKEY:statistical analysis, h_i, 21 cm, galaxies, turbulence, ,
CODE: stanimirovic2001