AAS 206th Meeting, 29 May - 2 June 2005
Session 38 Interstellar Medium, H II Regions and Molecular Clouds
Poster, Wednesday, 10:00am-7:00pm, Thursday, 9:20am-2:00pm, June 1, 2005, Ballroom A

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[38.18] Density Scaling and Anisotropy in Supersonic MHD Turbulence

A. Beresnyak, A. Lazarian (U. of Wisconsin-Madison), J. Cho (Chungnam Natl. Univ., Korea)

We study the statistics of density for supersonic turbulence in a medium with magnetic pressure larger than the gaseous pressure. Our simulations exhibit clumpy density structures, which contrast increases with the Mach number. At 10 Machs densities of some clumps are three orders of magnitude higher than the mean density. These clumps give rise to flat and approximately isotropic density spectrum corresponding to the random distribution of clumps in space. We claim that the clumps originate from our random, isotropic turbulence driving. When the contribution from those clumps is suppressed by studying logarithm of density, the density statistics exhibit scale-dependent anisotropy consistent with the models where density structures arise from shearing by Alfvén waves. It is noteworthy that originally such models were advocated for the case of low-Mach, nearly incompressible turbulence.

If you would like more information about this abstract, please follow the link to http://arxiv.org/abs/astro-ph/0502547. This link was provided by the author. When you follow it, you will leave the Web site for this meeting; to return, you should use the Back comand on your browser.

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Bulletin of the American Astronomical Society, 37 #2
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