Paper: astro-ph/0601228
Date: Wed, 11 Jan 2006 01:10:36 GMT (25kb)

Title: Recent Results on Interstellar Turbulence

Authors: Miguel A. de Avillez (Department of Mathematics, University of Evora,
Portugal) and Dieter Breitschwerdt (Institut fur Astronomie, Universitat
Wien, Austria)

Comments: 4 pages, 2 figures including 5 plots. Contributed paper delivered at
the Portuguese National Astronomical & Astrophysics Meeting, held in Lisbon
(Portugal) on 28-29 July 2005
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The statistical properties of interstellar turbulence are studied by means of
three-dimensional high-resolution HD and MHD simulations of a SN-driven ISM. It
is found that the longitudinal and transverse turbulent length scales have time
averaged (over a period of 50 Myr) ratios of 0.5-0.6, almost similar to the one
expected for isotropic homogeneous turbulence. The mean characteristic size of
the larger eddies is found to be ~75 pc. Furthermore, the scalings of the
structure functions measured in the simulated disk show unambiguous departure
from the Kolmogorv (1941) model being consistent with the latest intermittency
studies of supersonic turbulence (Politano & Pouquet 1995; Boldyrev 2002). Our
results are independent of the resolution, indicating that convergence has been
reached, and that the unresolved smaller dissipative scales do not feed back on
the larger ones.

\\ ( http://arXiv.org/abs/astro-ph/0601228 , 25kb)