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Density PDFs of Super-Sonic Turbulence

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arxiv astro-ph/9810074 v1 pith:TI57CJCW submitted 1998-10-06 astro-ph

Density PDFs of Super-Sonic Turbulence

classification astro-ph
keywords densityturbulencesupersonicaddressedanalyticalapproximatelybecomeseffective
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The question of the shape of the density PDF for supersonic turbulence is addressed, using both analytical and numerical methods. For isothermal supersonic turbulence, the PDF is Log-Normal, with a width that scales approximately linearly with the Mach number. For a polytropic equation of state, with an effective gamma smaller than one, the PDF becomes skewed and reminiscent of (but not equal to) a power law on the high density side.

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