Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...390...39s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 390, no. 1, May 1, 1992, p. 39-45.
Astronomy and Astrophysics
Astrophysics
119
Cosmic Dust, Interstellar Extinction, Quasars, Spectral Line Width, Stellar Spectra, Absorption Spectra, Line Spectra, Lyman Alpha Radiation, Spectrum Analysis
Scientific paper
Recently, Weymann et al. (1991) presented composite spectra of broad absorption line (BAL) QSOs as divided into two classes, those with spectra containing absorption from both high and low-ionization ionic species, and those showing only high-ionization absorption troughs. They showed that the spectral properties of the former class differed from those of the latter in that their spectra contain stronger emission from Fe II and possibly Fe III, their continua are substantially redder, and Lyman-alpha and N v emission lines are weaker. In this contribution it is shown that correction for the extinction of a modest amount of dust can bring the spectra into coincidence. This extinction is not sufficient to explain the strong infrared-to-optical flux ratios seen in some of these objects. Differential k-corrections due to dust extinction are large enough that low-ionization BAL QSOs may be substantially underrepresented in magnitude-limited samples of QSOs.
Foltz Craig B.
Sprayberry David
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