Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...331..211a&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 331, Aug. 1, 1988, p. 211-246.
Astronomy and Astrophysics
Astrophysics
33
Emission Spectra, Galactic Nuclei, Line Spectra, Quasars, Radiative Transfer, Astronomical Models, Molecular Clouds
Scientific paper
This paper discusses photoionization models attempting to account for the broad emission lines from quasi-stellar objects. The authors solve the radiative transfer, statistical equilibrium, and energy-balance equations for an illuminated, plane-parallel cloud having a prescribed optical thickness and constant gas pressure. The cloud composition is assumed to be either pure hydrogen or H and He in the ratio 1 to 0.1. In addition, heavier elements are presumed to provide radiative cooling and heating and to absorb X-rays. Six energy-balance models are presented, all having the same illuminating radiation, optical thickness, and pressure. The largest changes in the calculated results are due to heavy-element cooling and to line transfer effects with partial frequency redistribution.
Avrett Eugene H.
Loeser Rudolf
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