Nonlinear thermal instability in a nonstationary medium - The evolution of density fluctuations

Details Nonlinear thermal instability in a nonstationary medium - The evolution of density fluctuations Nonlinear thermal instability in a nonstationary medium - The evolution of density fluctuations

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990azh....67...40k&link_type=abstract

Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 67, Jan.-Feb. 1990, p. 40-53. In Russian.

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Density Distribution, Galactic Clusters, Galactic Evolution, Interstellar Gas, Thermal Instability, Computational Astrophysics, Gravitational Effects, High Temperature Gases, Perturbation Theory, Thermal Conductivity

Scientific paper

Condensational instability of radiating hot intergalactic gas is considered. This instability is the possible cause of formation of the inhomogeneous structure in the intracluster medium. The modal content of diverse initial disturbances and the evolution of density fluctuations are investigated. The influence of initial fluctuations spectrum and of the initial gas temperature on the properties of inhomogeneities formed when gaseous clumps cool to about 10,000 K is analyzed by means of one-dimensional nonlinear gas-dynamic modeling. The effects of thermal conductivity are simulated with the introduction of threshold wavelength in the initial spectrum. It is found that gas cooling from 10 million K results in the formation of compact gas clumps containing less than 30 percent of the total mass.

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