An effective Q parameter for two-fluid instabilities in spiral galaxies

Details An effective Q parameter for two-fluid instabilities in spiral galaxies An effective Q parameter for two-fluid instabilities in spiral galaxies

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.275..944e&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 275, Issue 4, pp. 944-950.

Astronomy and Astrophysics

Astronomy

52

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

Scientific paper

The equations for the two-fluid instability developed by Jog & Solomon are reduced to a form in which a single Q_eff parameter determines the state of gravitational stability. This parameter has the correct values in the limits of either fluid alone and is a natural extension of the usual one-fluid Q parameter to the two-fluid case. Finite thickness effects are included. Variations in Q_eff with radius for typical galaxies are studied. The results suggest that the axisymmetric stability properties of a galactic disc can be estimated from the pure gas stability parameter, Q_g, only when Q_g<

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