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For refcode 1998AJ....115.1737K:
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1998AJ....115.1737K THE IDENTIFICATION OF QUASARS BEHIND ELLIPTICAL GALAXIES AND CLUSTERS OF GALAXIES PATRICIA M. KNEZEK Las Campanas Observatory, Observatories of the Carnegie Institution of Washington, Casilla 601, La Serena, Chile; pmk@pha.jhu.edu AND JOEL N. BREGMAN Department of Astronomy, University of Michigan, 830 Dennison Building, Ann Arbor, MI 48109-1090; jbregman@astro.lsa.umich.edu Received 1997 July 28; revised 1998 January 28 ABSTRACT 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 one-eighth of which are suitably bright quasars at moderate redshift. We identify 16 new quasars and galaxies with active galactic nuclei (AGNs) and confirm five known quasars and AGNs, superposed behind elliptical galaxies and clusters of galaxies. We also present three QSO/AGN candidates with uncertain redshift identifications. Key words: galaxies: clusters: general-quasars: general-X-rays
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