Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975sva....19....1g&link_type=abstract
(Astronomicheskii Zhurnal, vol. 52, no. 1, 1975, p. 3-8.) Soviet Astronomy, vol. 19, July-Aug. 1975, p. 1-3. Translation.
Astronomy and Astrophysics
Astronomy
5
Cosmic Plasma, Galactic Evolution, Plasma Heating, Thermal Instability, Compton Effect, Cooling, Cosmology, Electron Transitions, Energy Dissipation, Gravitational Effects, Magnetohydrodynamic Stability, Nonequilibrium Plasmas, Shock Fronts
Scientific paper
Conditions are analytically investigated in which condensations of galactic scale might arise as a consequence of a thermal instability prior to gravitational condensation. Equations are derived and analyzed which describe the thermal processes by which a plasma would be heated by shock waves caused by large-scale hydrodynamic motions in the metagalactic medium, would cool because of Compton scattering and free-free energy transitions, and would be compressed behind shock fronts under approximately constant pressure. When free-free radiation became dominant, a thermal instability would arise and the plasma would fragment into condensations with masses on the order of typical galactic masses. It is shown that under these conditions, a thermal instability of this type would develop faster than a gravitational instability.
Chernin Arthur D.
Gurevich L. E.
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