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The Planck catalogues of SZ sources, PSZ1 and PSZ2, are the largestcatalogues of galaxy clusters selected through their SZ signature in the fullsky. In 2013, we started a long-term observational program at Canary Islandobservatories with the aim of validating about 500 unconfirmed SZ sources. Inthis work we present results of the initial pre-screening of possible clustercounterparts using photometric and spectroscopic data of the Sloan Digital SkySurvey DR12. Our main aim is to identify previously unconfirmed PSZ2 clustercandidates and to contribute in determination of the actual purity andcompleteness of Planck SZ source sample. Using the latest version of the PSZ2catalogue, we select all sources overlapping with the SDSS DR12 footprint andwithout redshift information. We validate these cluster fields followingoptical criteria (mainly distance with respect to the Planck pointing,magnitude of the brightest cluster galaxy and cluster richness) and combiningthem with the profiles of the Planck Compton y-maps. Together, this procedureallows for a more robust identification of optical counterparts compared tosimply cross-matching with existing SDSS cluster catalogues that have beenconstructed from earlier SDSS Data Releases. The sample contains new redshiftsfor 37 Planck galaxy clusters that were not included in the original release ofPSZ2 Planck catalogue. We detect three cases as possible multiple counterparts.We show that a combination of all available information (optical images andprofile of SZ signal) can provide correct associations between the observedPlanck SZ source and the optically identified cluster. We also show that PlanckSZ detection is very sensitive even to high-z (z>0.5) clusters. In addition, wealso present updated spectroscopic information for 34 Planck PSZ1 sources (33previously photometrically confirmed and 1 new identification).

Characterization of a subsample of the Planck SZ source cluster catalogues using optical SDSS DR12 data