On the Origin of Small-Scale Structure in Self-gravitating Two-Phase Gas

Details On the Origin of Small-Scale Structure in Self-gravitating Two-Phase Gas On the Origin of Small-Scale Structure in Self-gravitating Two-Phase Gas

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...465..769k&link_type=abstract

Astrophysical Journal v.465, p.769

Astronomy and Astrophysics

Astronomy

13

Galaxy: Formation, Galaxy: Globular Clusters: General, Gravitation, Hydrodynamics, Ism: Clouds

Scientific paper

We discuss the origin of multiscale structures in a mixture of a diffuse phase (phase I [PI]) and a dense phase (phase II [PII]) by linear analysis, using the notion of multiphase fluid dynamics (MPFD). We can then describe in terms of hydrodynamics how the seeds for small-scale structures, whose scale is smaller than the Jeans length, appear during the contraction of clouds. This suggests that our method can describe the origin of structure in self-gravitating gas systems.
It is known that the systems with two-phase mixture of gases generally have two modes of waves according to MPFD. One mode (f-mode) corresponds to a sound wave, and the other mode (s-mode) is known as a void wave. The s-mode has smaller phase velocities in the two-phase medium than the f-mode. And since the s-mode is unstable against the self-gravity, seeds for smaller scale structure than the ordinary Jeans length can appear. This is because the repulsive effects by ambient phase I gas becomes less effective to the gravitational attractions among blobs of phase II gas. So the s-mode coupled with self-gravity may give rise to the clumpy structure in a molecular cloud, a globular cluster, and the interstellar medium of a galaxy.

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