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Title:
Nine new quasi-stellar objects with broad absorption lines
Authors:
Hazard, C.; Morton, D. C.; Terlevich, R.; McMahon, R.
Affiliation:
AA(Pittsburgh, University, Pittsburgh, PA; Cambridge University, Cambridge, England; Royal Observatory, Edinburgh, Scotland), AB(Anglo-Australian Observatory, Epping, New South Wales, Australia), AC(Cambridge University, Cambridge, England), AD(Cambridge University, Cambridge, England)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 282, July 1, 1984, p. 33-52. (ApJ Homepage)
Publication Date:
07/1984
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Absorption Spectra, Astronomical Spectroscopy, Quasars, Emission Spectra, Red Shift, Spectrum Analysis
DOI:
10.1086/162174
Bibliographic Code:
1984ApJ...282...33H

Abstract

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.

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