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We present a galaxy cluster survey based on XMM-Newton observations that arelocated in Stripe 82 of the Sloan Digital Sky Survey (SDSS). The survey coversan area of 11.25 deg$^2$. The X-ray cluster candidates were selected asserendipitously extended detected sources from the third XMM-Newtonserendipitous source catalogue (3XMM-DR5). A cross-correlation of the candidatelist that comprises 94 objects with recently published X-ray and opticallyselected cluster catalogues provided optical confirmations and redshiftestimates for about half of the candidate sample. We present a catalogue ofX-ray cluster candidates previously known in X-ray and/or optical bands fromthe matched catalogues or NED. The catalogue consists of 54 systems withredshift measurements in the range of 0.05-1.19 with a median of 0.36. Ofthese, 45 clusters have spectroscopic confirmations as stated in the matchedcatalogues. We spectroscopically confirmed another 6 clusters from theavailable spectroscopic redshifts in the SDSS-DR12. The cluster catalogueincludes 17 newly X-ray discovered clusters, while the remainder were detectedin previous XMM-Newton and/or ROSAT cluster surveys. Based on the availableredshifts and fluxes given in the 3XMM-DR5 catalogue, we estimated the X-rayluminosities and masses for the cluster sample. We also present the list of theremaining X-ray cluster candidates (40 objects) that have no redshiftinformation yet in the literature. Of these candidates, 25 sources areconsidered as distant cluster candidates beyond a redshift of 0.6. We alsosearched for galaxy cluster mergers in our cluster sample and found two strongcandidates for newly discovered cluster mergers at redshifts of 0.11 and 0.26.The X-ray and optical properties of these systems are presented.

The 3XMM/SDSS Stripe 82 Galaxy Cluster Survey: Cluster catalogue and discovery of two merging cluster candidates