Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...275...53e&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 275, Dec. 1, 1983, p. 53-60.
Astronomy and Astrophysics
Astrophysics
14
Continuous Spectra, Hydrogen Clouds, Lyman Spectra, Quasars, Relativistic Velocity, Ultraviolet Absorption, Lyman Alpha Radiation, Neutral Gases, Optical Thickness, Radiation Distribution, Spectral Energy Distribution
Scientific paper
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.
Eastman Ronald G.
MacAlpine Gordon M.
Richstone Douglas O.
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