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Clusters of galaxies have long been used as laboratories for the study ofgalaxy evolution, but despite intense, recent interest in feedback between AGNsand their hosts, the impact of environment on these relationships remainspoorly constrained. We present results from a study of AGNs and their hostgalaxies found in low-redshift galaxy clusters. We fit model spectral energydistributions (SEDs) to the combined visible and mid-infrared (MIR) photometryof cluster members and use these model SEDs to determine stellar masses andstar-formation rates (SFRs). We identify two populations of AGNs, the firstbased on their X-ray luminosities (X-ray AGNs) and the second based on thepresence of a significant AGN component in their model SEDs (IR AGNs). We findthat the two AGN populations are nearly disjoint; only 8 out of 44 AGNs areidentified with both techniques. We further find that IR AGNs are hosted bygalaxies with similar masses and SFRs but higher specific SFRs (sSFRs) thanX-ray AGN hosts. The relationship between AGN accretion and host star-formationin cluster AGN hosts shows no significant difference compared to therelationship between field AGNs and their hosts. The projected radialdistributions of both AGN populations are consistent with the distribution ofother cluster members. We argue that the apparent dichotomy between X-ray andIR AGNs can be understood as a combination of differing extinction due to coldgas in the host galaxies of the two classes of AGNs and the presence of weakstar-formation in X-ray AGN hosts.

A Multi-Wavelength Study of Low Redshift Clusters of Galaxies I. Comparison of X-ray and Mid-Infrared Selected AGNs