Speaker: Dr. Michael Wise, Astronomical Institute "Anton Pannekoek",
         University of Amsterdam, Amsterdam, Netherlands

Title: "AGN Heating and Feedback in Clusters of Galaxies"

Abstract: Recent X-ray and radio data on clusters of galaxies clearly
demonstrate the profound impact of AGN in cluster cores on the
surrounding intracluster medium (ICM). The realization that powerful
outbursts from AGN can release upwards of 1061 erg into the ICM
suggests a common solution to several cooling related issues long
associated with clusters and groups of galaxies. AGN feedback has
emerged as the most likely mechanism for regulating not only the cooling
of the hot gas in clusters, but also the growth of the central cD
galaxies themselves and their attendant super-massive black holes. The
combination of deep X-ray imaging and low frequency radio data provide
some of the most reliable and accurate diagnostics of AGN in clusters.
Using results from a recent sample of clusters with both X-ray and low
frequency radio data, we discuss here the limits we can place on the
age, total energy output, and duty-cycle of activity for the central AGN
in these systems. As w e show, low frequency radio emission appears to
be an excellent proxy for the integrated energy output of the central
AGN over the last several 100 Myr. We will discuss the possibilities for
studying these systems in greater number and detail with emerging low
frequency instruments such as LOFAR. Finally, we will also discuss the
implications these data have for the growth of super-massive black holes
and models of galaxy formation.