Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-05-11
Astronomy and Astrophysics
Astrophysics
10 pages, Figures 1a-d, 2a-c as 7 gif files, 2 postscript tables, AJ, in press
Scientific paper
10.1086/300319
The detection of resonance absorption lines against known objects such as individual galaxies and clusters of galaxies is a powerful approach for studying the gas content of these systems. We describe an efficient method of identifying background quasars suitable for absorption line studies. In this finding technique, we identify serendipitous X-ray sources, about 1/8 of which are suitably bright quasars at moderate redshift. We identify 16 new quasars and galaxies with active galactic nuclei (AGNs), and confirm 5 known quasars and AGNs, superimposed behind elliptical galaxies and clusters of galaxies. We also present 3 QSO/AGN candidates with uncertain redshift identifications.
Bregman Joel N.
Knezek Patricia M.
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