Planck early results. IX. XMM-Newton follow-up for validation of Planck cluster candidates
Creators: name: Planck Collaboration
name: Aghanim, N.
name: Arnaud, M.
name: Ashdown, M.
name: Aumont, J.
name: Baccigalupi, C.
name: Balbi, A.
name: Banday, A. J.
name: Barreiro, R. B.
name: Bartelmann, M.
name: Bartlett, J. G.
name: Battaner, E.
name: Benabed, K.
name: Benoît, A.
name: Bernard, J. -P.
name: Bersanelli, M.
name: Bhatia, R.
name: Bock, J. J.
name: Bonaldi, A.
name: Bond, J. R.
name: Borrill, J.
name: Bouchet, F. R.
name: Brown, M. L.
name: Bucher, M.
name: Burigana, C.
name: Cabella, P.
name: Cardoso, J. -F.
name: Catalano, A.
name: Cayòn, L.
name: Challinor, A.
name: Chamballu, A.
name: Chary, R. R.
name: Chiang, L. Y
name: Chiang, C.
name: Chon, G.
name: Christensen, P. R.
name: Churazov, E.
name: Clements, D. L.
name: Colafrancesco, S.
name: Colombi, S.
name: Couchot, F.
name: Coulais, A.
name: Crill, B. P.
name: Cuttaia, F.
name: Da Silva, A.
name: Dahle, H.
name: Danese, L.
name: de Bernardis, P.
name: de Gasperis, G.
name: de Rosa, A.
name: de Zotti, G.
name: Delabrouille, J.
name: Delouis, J. -M.
name: Désert, F. -X.
name: Diego, J. M.
name: Dolag, K.
name: Donzelli, S.
name: Doré, O.
name: Dörl, U.
name: Douspis, M.
name: Dupac, X.
name: Efstathiou, G.
name: Ensslin, T. A.
name: Finelli, F.
name: Flores, I.
name: Forni, O.
name: Frailis, M.
name: Franceschi, E.
name: Fromenteau, S.
name: Galeotta, S.
name: Ganga, K.
name: Génova-Santos, R. T.
name: Giard, M.
name: Giardino, G.
name: Giraud-Héraud, Y.
name: González-Nuevo, J.
name: Górski, K. M.
name: Gratton, S.
name: Gregorio, A.
name: Gruppuso, A.
name: Harrison, D.
name: Henrot-Versillé, S.
name: Hernández-Monteagudo, C.
name: Herranz, D.
name: Hildebrandt, S. R.
name: Hivon, E.
name: Hobson, M.
name: Holmes, W. A.
name: Hovest, W.
name: Hoyland, R. J.
name: Huffenberger, K. M.
name: Jaffe, A. H.
name: Jones, W. C.
name: Juvela, M.
name: Keihänen, E.
name: Keskitalo, R.
name: Kisner, T. S.
name: Kneissl, R.
name: Knox, L.
name: Kurki-Suonio, H.
name: Lagache, G.
name: Lamarre, J. -M.
name: Lasenby, A.
name: Laureijs, R. J.
name: Lawrence, C. R.
name: Leach, S.
name: Leonardi, R.
name: Linden-Vornle, M.
name: López-Caniego, M.
name: Lubin, P. M.
name: Macías-Pérez, J. -F.
name: MacTavish, C. J.
name: Maffei, B.
name: Maino, D.
name: Mandolesi, N.
name: Mann, R.
name: Maris, M.
name: Marleau, F.
name: Martínez-González, E.
name: Masi, S.
name: Matarrese, S.
name: Matthai, F.
name: Mazzotta, P.
name: Melchiorri, A.
name: Melin, J. -B.
name: Mendes, L.
name: Mennella, A.
name: Mitra, S.
name: Miville-Deschênes, M. -A.
name: Moneti, A.
name: Montier, L.
name: Morgante, G.
name: Mortlock, D.
name: Munshi, D.
name: Murphy, A.
name: Naselsky, P.
name: Natoli, P.
name: Netterfield, C. B.
name: Norgaard-Nielsen, H. U.
name: Noviello, F.
name: Novikov, D.
name: Novikov, I.
name: Osborne, S.
name: Pajot, F.
name: Pasian, F.
name: Patanchon, G.
name: Perdereau, O.
name: Perotto, L.
name: Perrotta, F.
name: Piacentini, F.
name: Piat, M.
name: Pierpaoli, E.
name: Piffaretti, R.
name: Plaszczynski, S.
name: Pointecouteau, E.
name: Polenta, G.
name: Ponthieu, N.
name: Poutanen, T.
name: Pratt, G. W.
name: Prézeau, G.
name: Prunet, S.
name: Puget, J. -L.
name: Rebolo, R.
name: Reinecke, M.
name: Renault, C.
name: Ricciardi, S.
name: Riller, T.
name: Ristorcelli, I.
name: Rocha, G.
name: Rosset, C.
name: Rubiõo-Martín, J. A.
name: Rusholme, B.
name: Sandri, M.
name: Santos, D.
name: Schaefer, B. M.
name: Scott, D.
name: Seiffert, M. D.
name: Smoot, G. F.
name: Starck, J. -L.
name: Stivoli, F.
name: Stolyarov, V.
name: Sunyaev, R.
name: Sygnet, J. -F.
name: Tauber, J. A.
name: Terenzi, L.
name: Toffolatti, L.
name: Tomasi, M.
name: Tristram, M.
name: Tuovinen, J.
name: Valenziano, L.
name: Vibert, L.
name: Vielva, P.
name: Villa, F.
name: Vittorio, N.
name: Wandelt, B. D.
name: White, S. D. M.
name: White, M.
name: Yvon, D.
name: Zacchei, A.
name: Zonca, A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We present the XMM-Newton follow-up for confirmation of Planck cluster candidates. Twenty-five candidates have been observed to date using snapshot (~10 ksec) exposures, ten as part of a pilot programme to sample a low range of signal-to-noise ratios (45 candidates. The sensitivity and spatial resolution of XMM-Newton allows unambiguous discrimination between clusters and false candidates. The 4 false candidates have S/N &lt;= 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 &lt;= z &lt;= 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, Y_SZ. 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 Y_SZ-Y_X relation established for X-ray selected objects, where Y_X is the product of the gas mass and temperature.
description: 21 pages, 16 figures (some low resolution), final version accepted for publication in A&amp;A