The implications of hydrogen emission line ratios in quasi-stellar objects

Details The implications of hydrogen emission line ratios in quasi-stellar objects The implications of hydrogen emission line ratios in quasi-stellar objects

Feb 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...236l...7c&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 236, Feb. 15, 1980, p. L7-L11.

Mathematics

Probability

46

H Lines, Line Spectra, Quasars, Radiative Transfer, Astronomical Models, Emission Spectra

Scientific paper

The results of multilevel, depth-dependent, fully interlocked radiative transfer calculations for hydrogen emission line strengths in a single QSO emission line cloud (ELC) are summarized. The hydrogen-line forming region of the ELC is found to be quite thick (tauel between 1,000 and 100,000), which is consistent with heating of a pure hydrogen cloud by photoionization. Results indicate that the volume-averaged escape probability approach introduces large errors by assuming, in effect, that a single point in the ELC is representative of the emergent radiation; that the influence of frequency redistribution on the photon escape probability in resonance and subordinate lines must be explicitly recognized, and that full consistency between excitation and ionization processes must be maintained.

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