Other
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...265...73j&link_type=abstract
Astrophysical Journal, Part 1, vol. 265, Feb. 1, 1983, p. 73-84.
Other
23
Absorption Spectra, Galactic Radiation, Galactic Structure, Quasars, Radiative Transfer, Spectral Energy Distribution, Astronomical Models, Electromagnetic Scattering, Molecular Clouds, Optical Density, Resonance Scattering, Spectral Line Width
Scientific paper
An approximate analytic solution of the radiative-transfer equation is used to estimate upper limits on the fraction of sky covered (Omega/4pi) by absorption regions near broad absorption-line quasars. The resonance scattering of line radiation tends to 'fill in' absorption troughs, and regions with large Omega/4pi produce troughs that are severely 'filled in'. PHL 5200 and several other broad absorption line quasars have absorption troughs that are flat-bottomed and deep. It is noted that these quasars probably have small Omega/4pi. Simple solutions are obtained for the case of large optical depth and a point central source using a two-stream model for the radiation field. It is shown that the scattered radiation can produce flat-bottomed absorption troughs if the logarithmic velocity derivative in the outflow is constant. For a large class of models, Omega/4pi is approximately less than the residual intensity (the fraction left after absorption) in a deep flat-bottomed absorption trough.
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