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Galaxies in clusters have undergone profoundly different evolution relative to their counterparts in the field. I will present new results that show the same holds true for the supermassive black holes at the centers of cluster galaxies. Comparision of low-redshift and high-redshift clusters shows that luminous AGN are substantially more common in high-redshift clusters, and that the population increases more rapidly than the field AGN population over the same redshift range. This substantial difference in the AGN evolution between the field and clusters is indicative of an environmental dependence to AGN downsizing. As AGN feedback appears to lead to substantial heating of the intracluster medium, the evolution of the AGN population may have important implications for the use of the intracluster medium as a cosmological tool.
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Request colloquia announcements by e-mail:
coll-request@astro.umd.edu
Colloquium Organizer:
Andrew Wilson (301) 405-1519
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Department of Astronomy, University of Maryland College Park, MD 20742-2421 Phone: (301) 405-3001 FAX: (301) 314-9067 Comments and questions may be directed to webmaster@astro.umd.edu
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12-Feb-2008.
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