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Title: Local stability criterion for a two component galactic disk
Authors: Jog, C. J
Keywords: Galaxies;Kinematics and dynamics-galaxies;ISM - galaxies;Spiral - instabilities
Issue Date: 2000
Publisher: Astronomical Society of India
Citation: BASI, Vol. 28, No. 2, pp. 309 - 310
Abstract: 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.
Appears in Collections:BASI Publications

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