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

Authors:Barreiro, R. Belén
Diego, J. M.
Herranz, D.
López-Caniego, M.
Vielva, P.
Martínez-González, Enrique
Keywords:Cosmology: observations, Galaxies: clusters: general, Catalogs
Issue Date:Dec-2011
Publisher:EDP Sciences
Citation:Astronomy and Astrophysics 536: A8 (2011)
Abstract: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⊙.
Description:28 páginas, 22 figuras, 3 tablas.-- Planck Collaboration: et al.
Publisher version (URL):http://dx.doi.org/10.1051/0004-6361/201116459
URI:http://hdl.handle.net/10261/46423
ISSN:0004-6361
E-ISSNmetadata.dc.identifier.doi = DOI:1432-0746
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