Thermochemical evolution of protogalactic gas in the adiabatic theory of galaxy formation

Details Thermochemical evolution of protogalactic gas in the adiabatic theory of galaxy formation Thermochemical evolution of protogalactic gas in the adiabatic theory of galaxy formation

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983azh....60..640s&link_type=abstract

(Astronomicheskii Zhurnal, vol. 60, July-Aug. 1983, p. 640-647) Soviet Astronomy (ISSN 0038-5301), vol. 27, July-Aug. 1983, p. 3

Astronomy and Astrophysics

Astronomy

3

Adiabatic Conditions, Cosmic Gases, Cosmochemistry, Galactic Evolution, Thermochemistry, Adiabatic Equations, Hydrogen, Reaction Kinetics, Stellar Evolution

Scientific paper

The kinetics of H2 formation in the isobarically cooled primeval gas is considered. Initially the gas is fully ionized, the initial temperature is T = 2×104K. The H2 molecules are born sufficiently rapid: 3×105 years after the gas had crossed the shock front, the relative abundance of H2 reaches the value ≡10-4. This ensures the cooling of the gas from T ≡ 104K to T ≡ 102K in a time of 107 years. The possibility of thermal instability is discussed.

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