On thermal instability and hydrostatic equilibrium in cooling flows

Details On thermal instability and hydrostatic equilibrium in cooling flows On thermal instability and hydrostatic equilibrium in cooling flows

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...328..395b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 328, May 15, 1988, p. 395-403. Research supported by the University of Virg

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Cosmic Gases, Equilibrium Flow, Galactic Clusters, Hydrostatics, Intergalactic Media, Thermal Instability, Computational Astrophysics, Heat Sources, Perturbation Theory, Subsonic Flow, X Ray Sources

Scientific paper

This paper addresses the nature of thermal instability in cluster cooling flows. Spherical systems characterized by hydrostatic equilibrium are studied using Lagrangian techniques. Several new results have been found, some of which are not consistent with previous work. The reasons for this are discussed. Local radial isobaric thermal instability does not exist. There is a strong, quantitative connection between thermal and convective instabilities. A new convective stability criterion is derived that is stronger than the Schwarzschild criterion and is necessary to suppress convection evolving on thermal scales. Convective energy transport is not likely to be a dominant process in cooling flows.

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