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Planck early results. VIII. The all-sky early Sunyaev-Zeldovich cluster sample

Planck early results. VIII. The all-sky early Sunyaev-Zeldovich cluster sample,10.1051/0004-6361/201116459,Astronomy & Astrophysics,P. A. R. Ade,N. Ag

Planck early results. VIII. The all-sky early Sunyaev-Zeldovich cluster sample   (Citations: 10)
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P. A. R. Ade, N. Aghanim, M. Arnaud, M. Ashdown, J. Aumont, C. Baccigalupi, A. Balbi, A. J. Banday, R. B. Barreiro, M. Bartelmann, J. G. Bartlett, E. Battanerhttp://academic.research.microsoft.com/io.ashx?type=5&id=27612767&selfId1=0&selfId2=0&maxNumber=12&query=
We 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&sun;. Corresponding author: M. Douspis, e-mail: marian.douspis@ias.u-psud.frAppendix is available in electronic form at http://www.aanda.org
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