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We present a measurement of the fraction of cluster galaxies hosting X-raybright Active Galactic Nuclei (AGN) as a function of clustercentric distancescaled in units of $r_{500}$. Our analysis employs high quality Chandra X-rayand Subaru optical imaging for 42 massive X-ray selected galaxy cluster fieldsspanning the redshift range of $0.2 < z < 0.7$. In total, our study involves176 AGN with bright ($R <23$) optical counterparts above a $0.5-8.0$ keV fluxlimit of $10^{-14} \rm{erg} \ \rm{cm}^{-2} \ \rm{s}^{-1}$. When excludingcentral dominant galaxies from the calculation, we measure a cluster-galaxy AGNfraction in the central regions of the clusters that is $\sim 3 $ times lowerthat the field value. This fraction increases with clustercentric distancebefore becoming consistent with the field at $\sim 2.5 r_{500}$. Our dataexhibit similar radial trends to those observed for star formation andoptically selected AGN in cluster member galaxies, both of which are alsosuppressed near cluster centers to a comparable extent. These results stronglysupport the idea that X-ray AGN activity and strong star formation are linkedthrough their common dependence on available reservoirs of cold gas.

X-ray Bright Active Galactic Nuclei in Massive Galaxy Clusters II: The Fraction of Galaxies Hosting Active Nuclei