Other
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...250..478k&link_type=abstract
Astrophysical Journal, Part 1, vol. 250, Nov. 15, 1981, p. 478-507.
Other
489
Astronomical Models, Emission Spectra, Galactic Nuclei, Line Spectra, Quasars, Seyfert Galaxies, Balmer Series, Ionic Collisions, Iron, Lyman Spectra, Metal Ions, Optical Thickness, Photoionization, Plasma Heating, Spectral Energy Distribution
Scientific paper
The photoionization and heating throughout a quasar emission-line cloud optically thick at the Lyman edge are calculated. Photoionization and collisional ionization from excited states of hydrogen are included, which maintain a substantial electron fraction after the exhaustion of Lyman continuum photons halts ground-state photoionization. Observed values are explained for Ly-alpha/H-beta, H-alpha/H-beta, P-alpha/H-alpha, He I 5876/H-beta, O I 8446/H-alpha, and Mg II 2798/H-beta. The dependence of line strengths on physical conditions is discussed, and plotting Fe II/4570/H-beta versus Balmer continuum/H-beta is suggested. Other observations are also suggested, and the degree of asymmetry is given between the forward and backward emission of lines from a finite slab to make possible the use of comparative line profile studies to elucidate cloud kinematics.
Krolik Julian H.
Kwan Juliana
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