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Open Access item Planck early results. IX. XMM-Newton follow-up for validation of Planck cluster candidates

Authors:Barreiro, R. Belén
Diego, J. M.
Herranz, D.
López-Caniego, M.
Vielva, P.
Keywords:Cosmology: observations, Galaxies: clusters: general, Galaxies: clusters: intracluster medium, Cosmic background radiation, X-rays: galaxies: clusters
Issue Date:Dec-2011
Publisher:EDP Sciences
Citation:Astronomy and Astrophysics 536: A9 (2011)
Abstract:We present the XMM-Newton follow-up for confirmation of Planck cluster candidates. Twenty-five candidates have been observed to date using snapshot (~10ks) exposures, ten as part of a pilot programme to sample a low range of signal-to-noise ratios (4 < S/N < 6), and a further 15 in a programme to observe a sample of S/N > 5 candidates. The sensitivity and spatial resolution of XMM-Newton allows unambiguous discrimination between clusters and false candidates. The 4 false candidates have S/N ≤ 4.1. A total of 21 candidates are confirmed as extended X-ray sources. Seventeen are single clusters, the majority of which are found to have highly irregular and disturbed morphologies (about ~70%). The remaining four sources are multiple systems, including the unexpected discovery of a supercluster at z = 0.45. For 20 sources we are able to derive a redshift estimate from the X-ray Fe K line (albeit of variable quality). The new clusters span the redshift range 0.09 ≲ z ≲ 0.54, with a median redshift of z ~ 0.37. A first determination is made of their X-ray properties including the characteristic size, which is used to improve the estimate of the SZ Compton parameter, Y500. The follow-up validation programme has helped to optimise the Planck candidate selection process. It has also provided a preview of the X-ray properties of these newly-discovered clusters, allowing comparison with their SZ properties, and to the X-ray and SZ properties of known clusters observed in the Planck survey. Our results suggest that Planck may have started to reveal a non-negligible population of massive dynamically perturbed objects that is under-represented in X-ray surveys. However, despite their particular properties, these new clusters appear to follow the Y500–YX relation established for X-ray selected objects, where YX is the product of the gas mass and temperature.
Description:20 páginas, 12 figuras, 2 tablas.-- Planck Collaboration: et al.
Publisher version (URL):http://dx.doi.org/10.1051/0004-6361/201116460
URI:http://hdl.handle.net/10261/46406
ISSN:0004-6361
E-ISSNmetadata.dc.identifier.doi = DOI:1432-0746
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Appears in Collections:(IFCA) Artículos

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