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We present the results of a new analysis of the X-ray selected ActiveGalactic Nuclei (AGN) population in the vicinity of 135 of the most massivegalaxy clusters in the redshift range of 0.2 < z < 0.9 observed with Chandra.With a sample of more than 11,000 X-ray point sources, we are able to measure,for the first time, evidence for evolution in the cluster AGN population beyondthe expected evolution of field AGN. Our analysis shows that overall numberdensity of cluster AGN scales with the cluster mass as $\sim M_{500}^{-1.2}$.There is no evidence for the overall number density of cluster member X-ray AGNdepending on the cluster redshift in a manner different than field AGN, northere is any evidence that the spatial distribution of cluster AGN (given inunits of the cluster overdensity radius r_500) strongly depends on the clustermass or redshift. The $M^{-1.2 \pm 0.7}$ scaling relation we measure isconsistent with theoretical predictions of the galaxy merger rate in clusters,which is expected to scale with the cluster velocity dispersion, $\sigma$, as $\sim \sigma^{-3}$ or $\sim M^{-1}$. This consistency suggests that AGN inclusters may be predominantly triggered by galaxy mergers, a result that isfurther corroborated by visual inspection of Hubble images for 23spectroscopically confirmed cluster member AGN in our sample. A merger-drivenscenario for the triggering of X-ray AGN is not strongly favored by studies offield galaxies, however, suggesting that different mechanisms may be primarilyresponsible for the triggering of cluster and field X-ray AGN.

X-ray bright active galactic nuclei in massive galaxy clusters III: New insights into the triggering mechanisms of cluster AGN