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A key challenge in understanding the feedback mechanism of AGN in BrightestCluster Galaxies (BCGs) is the inherent rarity of catching an AGN during itsstrong outburst phase. This is exacerbated by the ambiguity of differentiatingbetween AGN and clusters in X-ray observations. If there is evidence for an AGNthen the X-ray emission is commonly assumed to be dominated by the AGNemission, introducing a selection effect against the detection of AGN in BCGs.In order to recover these 'missing' clusters, we systematically investigate thecolour-magnitude relation around some ~3500 ROSAT All Sky Survey selected AGN,looking for signs of a cluster red sequence. Amongst our 22 candidate systems,we independently rediscover several confirmed systems, where a strong AGNresides in a central galaxy. We compare the X-ray luminosity to red sequencerichness distribution of our AGN candidate systems with that of a similarlyselected comparison sample of ~1000 confirmed clusters and identify seven'best' candidates (all of which are BL Lac objects), where the X-ray flux islikely to be a comparable mix between cluster and AGN emission. We confirm thatthe colours of the red sequence are consistent with the redshift of the AGN,that the colours of the AGN host galaxy are consistent with AGN, and, bycomparing their luminosities with those from our comparison clusters, confirmthat the AGN hosts are consistent with BCGs.

Hiding in Plain Sight - Recovering Clusters of Galaxies with the Strongest AGN in Their Cores