Physics
Scientific paper
Oct 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974pthph..52.1174s&link_type=abstract
Progress of Theoretical Physics, vol. 52, Oct. 1974, p. 1174-1187.
Physics
1
Cosmic Rays, Gas Heating, Heat Balance, Heavy Elements, Interstellar Gas, Abundance, Galactic Evolution, Gas Ionization, Interstellar Matter, Radiation Distribution, Thermal Stability
Scientific paper
The properties of the interstellar gas in which the heating balances the cooling (the heat-balance state) are investigated for the temperature range from 30 to 100,000,000 K, taking the abundance of heavy elements and the flux of low-energy cosmic rays as parameters. The temperature and the pressure of the gas in a heat-balance state are investigated as functions of the density for various values of these parameters, and it is found that the interstellar medium can assume the so-called two-phase structure for wide ranges of these parameters, and then in almost all stages of the galactic evolution. The growth time of the thermal instability is investigated and found to be short enough to realize the two-phase structure except for the case of a very small flux of low-energy cosmic rays with the ionization rate of hydrogen less than 10 to the minus 19th power per sec. The gas without heavy elements can also have a two-phase structure if more than 0.1% of hydrogen are in molecular form.
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