We present an analysis of the X-ray bright point source population in 43 massive clusters of galaxies observed with the Chandra X-ray Observatory .
We have constructed a catalog of 4210 rigorously selected X-ray point sources in these fields , which span a survey area of 4.2 \deg ^ { 2 } .
This catalog reveals a clear excess of sources when compared to deep blank-field surveys , which amounts to roughly 1 \pm 0.4 additional source per cluster , likely Active Galactic Nuclei ( AGN ) associated with the clusters .
The excess sources are located within the overdensity radius r _ { 500 } , with the largest excess observed near the cluster centers .
The average radial profile of the excess X-ray sources of the cluster are well described by a power law ( N ( r ) \sim r ^ { \beta } ) with an index of \beta \sim - 0.6 .
An initial analysis using literature results on the mean profile of member galaxies in massive X-ray selected clusters indicates that the fraction of galaxies hosting X-ray AGN rises with increasing clustercentric radius , being approximately 3 times higher near r _ { 500 } than in the central regions .
This trend is qualitatively similar to that observed for star formation in cluster member galaxies .