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Context. Clusters of galaxies are important for cosmology and astrophysics.They may be discovered through either the summed optical/IR radiationoriginating from their member galaxies or via X-ray emission originating fromthe hot intracluster medium. X- ray samples are not affected by projectioneffects but a redshift determination typically needs optical and infraredfollow-up to then infer X-ray temperatures and luminosities. Aims. We want toconfirm serendipitously discovered X-ray emitting cluster candidates andmeasure their cosmological redshift through the analysis and exploration ofmulti-wavelength photometric catalogues. Methods. We developed a tool, theIntegrated Cluster Finder (ICF), to search for clusters by determiningoverdensities of potential member galaxies in optical and infrared catalogues.Based on a spectroscopic meta-catalogue we calibrated colour-redshift relationsthat combine optical (SDSS) and IR data (UKIDSS, WISE). The tool is used toquantify the overdensity of galaxies against the background via a modifiedredMaPPer technique and to quantify the confidence of a cluster detection.Results. Cluster finding results are compared to reference catalogues found inthe literature. The results agree to within 95-98%. The tool is used to confirm488 out of 830 cluster candidates drawn from 3XMMe in the footprint of the SDSSand CFHT catalogues. Conclusions. The ICF is a flexible and highly efficienttool to search for galaxy clusters in multiple catalogues and is freelyavailable to the community. It may be used to identify the cluster content infuture X-ray catalogues from XMM-Newton and eventually from eROSITA.

The Integrated Cluster Finder for the ARCHES project