Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...377...39v&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 377, Aug. 10, 1991, p. 39-48.
Astronomy and Astrophysics
Astrophysics
15
Absorption Spectra, Galactic Evolution, H Ii Regions, Line Spectra, Quasars, Interacting Galaxies, Lyman Alpha Radiation, Star Formation Rate
Scientific paper
In recent years, several results concerning the QSO absorption-line systems indicate the possibility that they may be associated with star-forming regions in intervening galaxies. In this paper, the hypothesis that the metal absorption lines are produced in H II regions of intervening galaxies is explored. The method of analysis is mainly based on the C IV and Si IV absorption lines. A comparison between observed and calculated equivalent widths fix the characteristics of the absorbing H II region. The calculated equivalent widths are obtained from column densities given by photoionization models. The column densities are calculated for different lines of sight crossing the H II region at different distances from the star. The analysis of 20 absorption line systems shows that H II regions in intervening galaxies can be the origin of the metal-line absorption systems.
Gruenwald Ruth B.
Viegas M. M. S.
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