Mandolesi, NazzarenoNazzarenoMandolesiPlanck CollaborationAde, P. A. R.P. A. R.AdeAghanim, N.N.AghanimAngelakis, E.E.Angelakis2020-09-172020-09-172011-01-01https://hdl.handle.net/20.500.13025/3617We present the first all-sky sample of galaxy clusters detected blindly by the Planck satellite through the Sunyaev-Zeldovich (SZ) effect from its six highest frequencies. This early SZ (ESZ) sample is comprised of 189 candidates, which have a high signal-to-noise ratio ranging from 6 to 29. Its high reliability (purity above 95%) is further ensured by an extensive validation process based on Planck internal quality assessments and by external cross-identification and follow-up observations. Planck provides the first measured SZ signal for about 80% of the 169 previously-known ESZ clusters. Planck furthermore releases 30 new cluster candidates, amongst which 20 meet the ESZ signal-to-noise selection criterion. At the submission date, twelve of the 20 ESZ candidates were confirmed as new clusters, with eleven confirmed using XMM-Newton snapshot observations, most of them with disturbed morphologies and low luminosities. The ESZ clusters are mostly at moderate redshifts (86% with z below 0.3) and span more than a decade in mass, up to the rarest and most massive clusters with masses above 1 × 1015 M⊙.journal articlehttp://www.aanda.org/index.php?option=com_article&access=doi&doi=10.1051/0004-6361/201116475&Itemid=12954dcce0f8580fe1368eeb502