Planck early results. VIII. The all-sky early Sunyaev-Zeldovich cluster sample
|dc.identifier.citation||Ade, P. and Aghanim, N. and Arnaud, M. and Ashdown, M. and Aumont, J. and Baccigalupi, C. and Hurley-Walker, N. 2011. Planck early results. VIII. The all-sky early Sunyaev-Zeldovich cluster sample. Astronomy and Astrophysics. 536: pp. A8-1-A8-28.|
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☉.
|dc.subject||galaxies: clusters: general|
|dc.title||Planck early results. VIII. The all-sky early Sunyaev-Zeldovich cluster sample|
|dcterms.source.title||Astronomy and Astrophysics|
Credit: Ade, P. and Aghanim, N. and Arnaud, M. and Ashdown, M. and Aumont, J. and Baccigalupi, C. and Hurley-Walker, N. and others, Astronomy and Astrophysics. 536: pp. A8-1-A8-28, 2011, reproduced with permission. Copyright © ESO.