Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...282...33h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 282, July 1, 1984, p. 33-52.
Astronomy and Astrophysics
Astrophysics
92
Absorption Spectra, Astronomical Spectroscopy, Quasars, Emission Spectra, Red Shift, Spectrum Analysis
Scientific paper
Slit spectra of nine new broad absorption line (BAL) QSOs selected from objective prism plates are presented. These QSOs have a wide variety of properties. The emission redshifts range from 2.20 to 3.07 with Ly-alpha apparently absent in six of them. The absorption troughs have widths up to 25,000 km/s and blue edges displaced by as much as 36,000 km/s from the emission lines. Some narrow absorption lines also are present. Generally the ionization of the broad lines is high with C IV and N V always present and O VI occurring in at least three of our QSOs, whereas Ly-alpha absorption appears to be absent in at least three cases. It is proposed that the BAL QSOs can be ordered in an evolutionary sequence with the ejection of gas in the highest stages of ionization following the initial turn-on of the QSO. As this material expands away from the QSO lower ion stages become more prominent until a normal emission-line QSO appears.
Hazard Cyril
McMahon Richard
Morton Donald C.
Terlevich Robert
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