Local stability criterion for a two component galactic disk

Details Local stability criterion for a two component galactic disk Local stability criterion for a two component galactic disk

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000basi...28..309j&link_type=abstract

Bulletin of the Astronomical Society of India, Vol. 28, p. 309-310 (2000)

Statistics

Applications

1

Galaxies: Kinematics And Dynamics, Galaxies: Ism, Galaxies: Spiral, Instabilities

Scientific paper

The criterion for stability against local, axisymmetric perturbations in gravitationally coupled stars and gas in a galactic disk is obtained. The new feature is the inclusion of both stars and gas in the study, and a two-component analog of the standard one-component Q-criterion is obtained which is applicable to realistic galaxies consisting of stars and gas. The Qs-g value is shown to be always less than the Q values for the stars-alone and the gas-alone cases, thus a two-component system is more unstable than either component by itself. Hence, future studies of galaxies must use Qs-g as a measure of disk stability. The results obtained are general, and several applications for the stability, structure, and evolution of galaxies are discussed.

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