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Quasar Activity in Rich Galaxy Clusters

Published online by Cambridge University Press:  30 March 2016

H. K. C. Yee  and
E. Ellingson
H. K. C. Yee
Affiliation:
Department of Astronomy, University of Toronto, Toronto, Ont. M5S 1A6, Canada
E. Ellingson
Affiliation:
Dominion Astrophysical Observatory, Victoria, BC, V8X 4M6, Canada

Extract

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We have carried out a number of imaging surveys of fields around quasars to study their global environments (e.g. Yee and Green 1987, Ellingson, Yee and Green 1991). The richness of the galaxy cluster environment of each quasar was determined using the galaxy-quasar spatial covariance amplitude, a quantity which is normalized for the expected luminosity and spatial distribution of galaxies (Longair and Seldner 1978, Yee and Green 1987). We find that ~40% of the brightest radio-loud quasars inhabit rich clusters of galaxies (Abell class 1 or higher) at z≳0.5 whereas only fainter AGN inhabit clusters at more recent epochs (Figure 1). This can be understood if quasars in rich clusters evolve much faster than those in poor environments.

Type
Joint Commission Meetings
Information
Highlights of Astronomy , Volume 9: Highlights of Astronomy. As presented at the XXIst General Assembly of the IAU, 1991 , 1992 , pp. 695 - 696
Copyright
Copyright © Kluwer 1992

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