Abstract
view Abstract Citations (48) References (22) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The implications of hydrogen emission line ratios in quasi-stellar objects Canfield, R. C. ; Puetter, R. C. Abstract 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. Publication: The Astrophysical Journal Pub Date: February 1980 DOI: 10.1086/183187 Bibcode: 1980ApJ...236L...7C Keywords: H Lines; Line Spectra; Quasars; Radiative Transfer; Astronomical Models; Emission Spectra; Astrophysics full text sources ADS |
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