The Identification of Quasars Behind Elliptical Galaxies and Clusters of Galaxies

Details The Identification of Quasars Behind Elliptical Galaxies and Clusters of Galaxies The Identification of Quasars Behind Elliptical Galaxies and Clusters of Galaxies

1998-05-11

arxiv.org/abs/astro-ph/9805134v1

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.

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