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We present an analysis of the X-ray bright point source population in 43massive clusters of galaxies observed with the Chandra X-ray Observatory. Wehave constructed a catalog of 4210 rigorously selected X-ray point sources inthese fields, which span a survey area of 4.2 square degrees. This catalogreveals a clear excess of sources when compared to deep blank-field surveys,which amounts to roughly 1 additional source per cluster, likely ActiveGalactic Nuclei (AGN) associated with the clusters. The excess sources areconcentrated within the virial radii of the clusters, with the largest excessobserved near the cluster centers. The average radial profile of the excessX-ray sources of the cluster are well described by a power law (N(r) ~ r^\beta)with an index of \beta ~ -0.5. An initial analysis using literature results onthe mean profile of member galaxies in massive X-ray selected clustersindicates that the fraction of galaxies hosting X-ray AGN rises with increasingclustercentric radius, being approximately 5 to 10 times higher near the virialradius than in the central regions. This trend is qualitatively similar to thatobserved for star formation in cluster member galaxies.

X-ray Bright Active Galactic Nuclei in Massive Galaxy Clusters I: Number Counts and Spatial Distribution