Physics – Atomic Physics
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...230..348s&link_type=abstract
Astrophysical Journal, Part 1, vol. 230, June 1, 1979, p. 348-359.
Physics
Atomic Physics
52
Astronomical Models, Astronomical Spectroscopy, Emission Spectra, Photoionization, Quasars, Ultraviolet Astronomy, Atomic Physics, Carbon, Cosmic Dust, Line Spectra, Radiation Absorption, Red Shift, Seyfert Galaxies
Scientific paper
The intensities of QSO ultraviolet emission lines are investigated with the aid of photoionization model calculations. In efforts directed toward understanding recent observations, particular consideration is given to such processes as charge-exchange reactions between ions of charge +3 or greater and neutral hydrogen, collisional quenching of UV resonance lines, and attenuation by dust. With the inclusion of internal dust in the numerical computations, a correlation is shown to be produced between the C IV 1549-A equivalent width and continuum luminosity if other parameters are held constant. It appears that external reddening due to material in the line of sight, in addition to some internal dust absorption of resonance transitions, may be important in regulating the observed intensity ratios of UV lines to optical lines.
MacAlpine Gordon M.
Shuder J. M.
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