The Identification of Quasars behind Elliptical Galaxies and Clusters of Galaxies | Zendy

P. M. Knezek | Zendy; Joel N. Bregman | Zendy

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The Identification of Quasars behind Elliptical Galaxies and Clusters of Galaxies

Author(s) -

P. M. Knezek,

Joel N. Bregman

Publication year - 1998

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/300319

Subject(s) - astrophysics , elliptical galaxy , quasar , physics , galaxy cluster , galaxy , galaxy group , peculiar galaxy , astronomy , brightest cluster galaxy , identification (biology) , biology , botany

The detection of resonance absorption lines against known objects such asindividual galaxies and clusters of galaxies is a powerful approach forstudying the gas content of these systems. We describe an efficient method ofidentifying background quasars suitable for absorption line studies. In thisfinding technique, we identify serendipitous X-ray sources, about 1/8 of whichare suitably bright quasars at moderate redshift. We identify 16 new quasarsand galaxies with active galactic nuclei (AGNs), and confirm 5 known quasarsand AGNs, superimposed behind elliptical galaxies and clusters of galaxies. Wealso present 3 QSO/AGN candidates with uncertain redshift identifications.Comment: 10 pages, Figures 1a-d, 2a-c as 7 gif files, 2 postscript tables, AJ, in pres

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