Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...249..422k&link_type=abstract
Astrophysical Journal, Part 1, vol. 249, Oct. 15, 1981, p. 422-442.
Astronomy and Astrophysics
Astrophysics
522
Astronomical Models, Emission Spectra, Hydrogen Clouds, Quasars, Two Phase Flow, X Ray Sources, Compton Effect, Gas Temperature, Line Spectra, Phase Diagrams, Photoionization, Spectrum Analysis
Scientific paper
It is demonstrated that the emitting gas in clouds of quasar emission line regions must be confined by a hot intercloud medium, provided only that the heating mechanisms are strong enough to drive the low-density intercloud gas above a few tens of millions degrees K. The study of the thermal properties of the gas presented includes heating by photoionization, Compton scattering, suprathermal particles, absorption of radio frequency radiation, cloud friction, thermal conduction, and shocks. Cooling curves for photoionized gases are presented, and phase diagrams analogous to the pressure-temperature diagrams used in studying the interstellar medium are constructed for various conditions. It is shown that two-phase equilibria occur over a wide range of mean density, but over a much narrower range of pressure. The implications of these results for the emission line region are discussed, and it is shown that the emission clouds may be short-lived.
Krolik Julian H.
McKee Christopher F.
Tarter Bruce C.
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