Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...302...64h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 302, March 1, 1986, p. 64-80. Research supported by the University of Cambr
Astronomy and Astrophysics
Astrophysics
80
Astronomical Spectroscopy, Emission Spectra, Quasars, Spectral Energy Distribution, Spectral Line Width, Abundance, Aluminum, Carbon, Iron, Spectrum Analysis
Scientific paper
The properties of the emission-line regions in 16 broad absorption line (BAL) quasars are compared to those of non-BAL quasars. It is found that about half the BAL quasars, those having detached BALs, are significantly different from the comparison samples of normal quasars. They have large Al III/semiforbidden C III intensity ratios, strong Fe II emission, and unusually weak C IV emission lines whose profiles do not agree well with those of the lower ionization emission lines. New spectra of the Mg II 2798 A region in 13 of these BAL quasars show a few cases of possible weak Mg II BAL absorption, but no unambiguously strong cases. Thus, it is concluded that strong BAL absorption in Mg II is rare. The quasar H0335 -336 has very narrow emission lines (1000 km/s), and thus may offer a rare opportunity to measure many weak or normally blended emission lines which can give information about physical conditions in the emission-line gas.
Baldwin John A.
Hartig George F.
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