Other
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...358..375b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 358, Aug. 1, 1990, p. 375-391. Research supported by Rockwell International
Other
103
Interstellar Matter, Lyman Alpha Radiation, Mass Transfer, Nonuniform Plasmas, Quasars, Thermal Conductivity, Absorption Spectra, Active Galactic Nuclei, Compton Effect, Lyman Spectra
Scientific paper
The evolution of two-phase systems of astrophysical gases which change mass between the phases is studied to see whether a steady state is ever reached. The criterion for thermal instability in a cloudy medium is derived. The evolution of the pressure and density of the intercloud medium under the combined effects of heating and radiative cooling of the intercloud gas on the one hand and evaporation and condensation of the clouds on the other is determined. The equilibrium density to which the system evolves is determined for the case when the pressure is fixed. The theory is illustrated by the case in which the intercloud gas is heated by Compton scattering in a hard radiation field and cooled by bremsstrahlung and inverse Compton scattering.
Begelman Mitchell C.
McKee Christopher F.
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