Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-08-05
Astronomy and Astrophysics
Astrophysics
5 pages, 3 figures, accepted to ApJL, simulation movies available at http://www.ita.uni-heidelberg.de/~chfeder/videos.shtml?la
Scientific paper
10.1086/595280
The probability density function (PDF) of the gas density in turbulent supersonic flows is investigated with high-resolution numerical simulations. In a systematic study, we compare the density statistics of compressible turbulence driven by the usually adopted solenoidal forcing (divergence-free) and by compressive forcing (curl-free). Our results are in agreement with studies using solenoidal forcing. However, compressive forcing yields a significantly broader density distribution with standard deviation ~3 times larger at the same rms Mach number. The standard deviation-Mach number relation used in analytical models of star formation is reviewed and a modification of the existing expression is proposed, which takes into account the ratio of solenoidal and compressive modes of the turbulence forcing.
Federrath Christoph
Klessen Ralf S.
Schmidt Wolfram
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