Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.313..112v&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 313, Issue 1, pp. 112-116.
Astronomy and Astrophysics
Astronomy
1
Gravitation, Instabilities, Ism: Clouds, Galaxies: Ism, Galaxies: Spiral
Scientific paper
We investigate the conditions under which a self-gravitating system of particles of different masses may be gravitationally unstable if there is a systematic correlation between the random velocity of a particle and its mass. For an isotropic uniform medium without rotation but with mass spectrum and velocity depending on the particle mass, a situation arises where the Jeans length for such a system may be significantly smaller than for the case when some mean values are used instead of mass and velocity spectra. For a differentially rotating medium, representing a spiral galaxy, we obtain the analogue of the Toomre parameter for a heterogeneous (multi-component) system. We demonstrate that the gas system in spirals represented by an ensemble of giant molecular clouds may be considerably less stable in the case of random velocity-mass correlation than for a system with unique velocity dispersion.
Ortega Vladimir G.
Volkov Evgeny
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