Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ap%26ss.175...57s&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 175, no. 1, Jan. 1991, p. 57-88.
Astronomy and Astrophysics
Astrophysics
9
Galactic Evolution, Gas Heating, Hydrogen, Interstellar Gas, Shock Waves, Gas Dynamics, Gas Ionization, H Lines, Particle Interactions, Shock Fronts, Thermal Energy, Thermodynamic Properties
Scientific paper
Thermal evolution and formation of H2 molecules in hot pregalactic gas processed by fast shock waves are investigated both in 'pancake' and hydrodynamical scenarios of galaxy formation. It is pointed out that an essential feature of thermodynamics of shocked gas is inequality of temperatures of electrons and heavy particles (atoms and ions): for a wide range of conditions electrons are colder than atoms. Particularly, it makes difficult collisional ionization of matter, and provides predominantly neutral flow of gas behind shock front with shock velocity less than 500 km/s. It is shown that under such conditions, cooling of post-shock gas is more efficient than in the single-temperature approximation, and the possibilities for the development of thermal instability become more favorable. The luminosity of pregalactic aggregates of excited gas is estimated and possible observational properties are discussed.
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