Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...290..394h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 290, March 15, 1985, p. 394-410.
Astronomy and Astrophysics
Astrophysics
29
Balmer Series, Emission Spectra, Hydrogen Clouds, Quasars, Radiative Transfer, H Alpha Line, Lyman Spectra, Photoionization, Seyfert Galaxies, Thermodynamic Equilibrium
Scientific paper
The authors present energy-balance calculations for finite, isobaric, hydrogen-slab quasar emission-line clouds which incorporate probabilistic radiative transfer (RT) in all lines and bound-free continua of a five-level plus continuum model hydrogen atom. They discuss the resulting line ratios, regions of line formation, level populations, and range of applicability of the models. The calculations neglect the effects of heavy elements and secondary ionizations from primary photoelectrons. An appendix presents a detailed comparison of differences between four different methods of treating the radiative transfer: (1) the probabilistic method, (2) an exact RT solution, (3) an effective two-level ρ = pe energy-balance calulation, and (4) a ρ = pe calculation explicitly incorporating indirect photon creation and destruction paths.
Hubbard E. N.
Puetter Richard C.
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