Mathematics – Logic
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...275..181i&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 275, Dec. 1, 1983, p. 181-194. Research supported by the Universidad de Los
Mathematics
Logic
30
Hydrogen Clouds, Hydrogen Plasma, Interstellar Chemistry, Magnetohydrodynamic Stability, Plasma Heating, Thermal Instability, Conductive Heat Transfer, Cosmology, Plasma Chemistry, Plasma Equilibrium, Plasma Waves, Space Plasmas, Thermochemical Properties
Scientific paper
In the present generalization of Field's (1965) criteria for thermal instability to the case of a reacting gas with thermal conduction, the critical wavelength of the marginal states is determined by the chemistry of the medium when the e-folding time for chemical processes is shorter than the e-folding time for thermal conduction. These criteria are applied to a pure hydrogen plasma model, heated at a constant rate. The cooling rate is assumed to be produced by recombinations, excitations, and ionizations by collisions, as well as free-free transitions. The hydrogen gas only becomes stable in the two temperature ranges lying below 8280 K and between 13700 and 19200 K. These values fit well with the galactic neutral gas component, together with the temperature of ionized gas in the halo of the Galaxy and the intergalactic gas, respectively. It is accordingly proposed that the galactic heating mechanism has a cosmological origin.
Iba~nez Miguel H. S.
Parravano Antonio
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