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Title:
On the nature of Mg II absorption line systems in quasars
Authors:
Drinkwater, M. J.; Webster, R. L.; Thomas, P. A.
Affiliation:
AA(Anglo-Australian Observatory, Coonabarabran, Australia; Observatoire du Mont Megantic, Quebec, Canada), AB(Melbourne Univ., Australia), AC(Sussex Univ., Brighton, United Kingdom)
Publication:
Astronomical Journal (ISSN 0004-6256), vol. 106, no. 3, p. 848-868. (AJ Homepage)
Publication Date:
09/1993
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ABSORPTION SPECTRA, MAGNESIUM, QUASARS, ASTRONOMICAL CATALOGS, ASTRONOMICAL PHOTOMETRY, ASTRONOMICAL SPECTROSCOPY, GRAVITATIONAL EFFECTS, IMAGE ANALYSIS, RED SHIFT
DOI:
10.1086/116689
Bibliographic Code:
1993AJ....106..848D

Abstract

The results of a large R-band imaging survey of 71 bright ( mV less than 18) quasars are presented. The quasars were chosen from published samples which have intermediate resolution optical spectroscopy available, so the presence of low redshift Mg II absorption lines can be determined. We have searched our data for galaxies close to the line-of-sight to the quasars, which we might be able to identify with the absorption systems. We find a high coincidence between galaxies very near the line-of-sight and quasars showing absorption systems in their spectra, a result consistent with other studies. These galaxies have a mean luminosity of 0.5 L* (assuming they lie at the absorption redshift). The distribution of impact parameters between the galaxies and the quasars extends with a flat distribution to large radii (greater than 30/h kpc). This suggests that the absorption systems may not be gravitationally bound to the observed galaxies, but may be part of larger extended systems.

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