Physics
Scientific paper
Aug 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011scgg.conf...22h&link_type=abstract
"Structure in Clusters and Groups of Galaxies in the Chandra Era, 2011 Chandra Science Workshop held July 12-14, 2011. Edited by
Physics
Scientific paper
Highly-luminous cool core clusters of galaxies (L_{X}>10^{45} erg/s) require extreme feedback from their central AGN in order to offset cooling of the ICM. For a typical BH mass (10^{9}M_{&sun;}), these AGN must be operating at high enough Eddington rates that they should be radiatively efficient. We would therefore expect to see an X-ray point source. We present a sample of such clusters for which there is NO evidence of a nuclear X-ray point source. Using Chandra, we derive upper limits of the nuclear luminosities and identify a range of possible explanations as to why these objects appear to be so radiatively-inefficient, each of which carries significant implications for the origin and operation of jets, including the possibility that these BHs are significantly more massive (≫10^{9} M_{&sun;}).
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