Gravitational instability of a composite system

Details Gravitational instability of a composite system Gravitational instability of a composite system

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ap%26ss.184..193b&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 184, no. 2, Oct. 1991, p. 193-203.

Astronomy and Astrophysics

Astrophysics

1

Conducting Fluids, Gravitational Fields, Interstellar Matter, Neutral Gases, Magnetic Fields, Magnetohydrodynamics

Scientific paper

The problem of instability arising in a composite system consisting of an infinitely conducting hydromagnetic fluid interacting through gravitational forces with one or more than neutral gas, is investigated, allowing for a possible relative streaming between the component fluids. Instability criteria are derived for special cases of a two-component (static or relatively streaming) system and for a three-component system consisting of two gases contra-streaming in the presence of a stationary background gas. It is found that for a static system only one unstable mode exists for wave numbers less than a critical value given by the square root of the sum of the squares of the Jeans's wave numbers for individual gases. However, for a configuration, where components are endured with characteristic streaming speeds, there are present simultaneously more than one unstable modes.

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