Abstract
view Abstract Citations (15) References (18) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS High-velocity absorbing cloudlets as potential contributors to observed quasar continua. Eastman, R. G. ; MacAlpine, G. M. ; Richstone, D. O. Abstract The observed steepening of quasar continua for frequencies above the Ly-alpha rest freqency is reproduced by absorption in marginally optically thin cloudlets moving away from quasars with a suitable velocity distribution. The calculations take into account Ly-alpha, Ly-beta and Lyman continuum absorption and also reemission back into the line of sight. For a reasonable match with observations, which extend nearly to 400 A in the rest frame of one quasar, a neutral hydrogen column density of about 10 to the 17th/sq cm is needed. The total hydrogen column density, which is proportional to N(H(+)/N(H(0)), could be considerably larger. The kinetic energy contained in the cloudlets is inversely proportional to the gas density and is of order 10 to the 61st ergs for a density near 10 to the 6th/cu cm. Reemission by the cloudlets could contribute to observed ultraviolet excesses in quasar continua, and the cloudlet gas would provide a potential environment for some quasar-reddening dust. Publication: The Astrophysical Journal Pub Date: December 1983 DOI: 10.1086/161511 Bibcode: 1983ApJ...275...53E Keywords: Continuous Spectra; Hydrogen Clouds; Lyman Spectra; Quasars; Relativistic Velocity; Ultraviolet Absorption; Lyman Alpha Radiation; Neutral Gases; Optical Thickness; Radiation Distribution; Spectral Energy Distribution; Astrophysics full text sources ADS | data products SIMBAD (5) NED (4)
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