A local stability criterion for the gaseous subsystem of a flat galaxy

Details A local stability criterion for the gaseous subsystem of a flat galaxy A local stability criterion for the gaseous subsystem of a flat galaxy

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985azh....62..209m&link_type=abstract

(Astronomicheskii Zhurnal, vol. 62, Mar.-Apr. 1985, p. 209-217) Soviet Astronomy (ISSN 0038-5301), vol. 29, Mar.-Apr. 1985, p. 1

Astronomy and Astrophysics

Astronomy

9

Galactic Structure, Gas Dynamics, Rotating Disks, Angular Velocity, Dynamic Stability, Perturbation Theory, Wave Propagation

Scientific paper

The local stability criterion is obtained according to which the velocity dispersion of gas clouds cg, necessary to stabilize a heterogeneous, differentially rotating gaseous subsystem of a flat galaxy against all nonaxisymmetric disturbances in its plane, should be cg = [1+f(dΩ/dr,dσ0/dr)]c0 (the estimates for the solar galactic vicinity yield f = 1.6), c0 = πGσ0/κ being the velocity dispersion sufficient to stabilize axisymmetric disturbances, Ω, σ0 - the angular rotational velocity and the surface density of the gaseous subsystem, κ - the epicyclic frequency.

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