Planck early results. XXVI. Detection with Planck and confirmation by XMM-Newton of PLCK G266.6-27.3, an exceptionally X-ray luminous and massive galaxy cluster at z ~ 1

N. Aghanim, M. Arnaud, M. Ashdown, F. Atrio-Barandela, J. Aumont, C. Baccigalupi, A. Balbi, A.J. Banday, R.B. Barreiro, J.G. Bartlett, E. Battaner, K. Benabed, A. Benoît, J.-P. Bernard, M. Bersanelli, R. Bhatia, H. Böhringer, A. Bonaldi, J.R. Bond, S. BorganiJ. Borrill, F.R. Bouchet, M.L. Brown, C. Burigana, P. Cabella, C.M. Cantalupo, B. Cappellini, P. Carvalho, A. Catalano, L. Cayón, L.-Y. Chiang, C. Chiang, G. Chon, P.R. Christensen, E. Churazov, D.L. Clements, S. Colafrancesco, S. Colombi, B.P. Crill, F. Cuttaia, A. Da Silva, H. Dahle, L. Danese, O.D. 'Arcangelo, R.J. Davis, P. De Bernardis, G. De Gasperis, G. De Zotti, J. Delabrouille, J.-M. Delouis, J. Démoclès, F.-X. Désert, C. Dickinson, J.M. Diego, H. Dole, S. Donzelli, O. Doré, M. Douspis, X. Dupac, G. Efstathiou, T.A. Enßlin, H.K. Eriksen, F. Finelli, I. Flores-Cacho, O. Forni, P. Fosalba, M. Frailis, E. Franceschi, S. Fromenteau, S. Galeotta, K. Ganga, R.T. Génova-Santos, M. Giard, J. González-Nuevo, R. González-Riestra, K.M. Górski, A. Gregorio, A. Gruppuso, F.K. Hansen, D. Harrison, P. Heinämäki, C. Hernández-Monteagudo, S.R. Hildebrandt, E. Hivon, M. Hobson, G. Hurier, A.H. Jaffe, W.C. Jones, M. Juvela, E. Keihänen, R. Keskitalo, T.S. Kisner, R. Kneissl, H. Kurki-Suonio, G. Lagache, A. Lähteenmäki, J.-M. Lamarre, A. Lasenby, C.R. Lawrence, M. Le Jeune, S. Leach, R. Leonardi, C. Leroy, A. Liddle, P.B. Lilje, M. López-Caniego, G. Luzzi, J.F. MacÍas-Pérez, D. Maino, N. Mandolesi, F. Marleau, E. Martínez-González, S. Masi, S. Matarrese, P. Mazzotta, P.R. Meinhold, A. Melchiorri, J.-B. Melin, L. Mendes, A. Mennella, M.-A. Miville-Deschênes, A. Moneti, L. Montier, G. Morgante, D. Mortlock, D. Munshi, P. Naselsky, P. Natoli, J. Nevalainen, H.U. Nørgaard-Nielsen, F. Noviello, D. Novikov, I. Novikov, I.J. O'Dwyer, S. Osborne, R. Paladini, F. Pasian, G. Patanchon, T.J. Pearson, O. Perdereau, L. Perotto, F. Perrotta, F. Piacentini, E. Pierpaoli, R. Piffaretti, P. Platania, E. Pointecouteau, G. Polenta, N. Ponthieu, L. Popa, T. Poutanen, G.W. Pratt, G. Prézeau, S. Prunet, J.-L. Puget, J.P. Rachen, R. Rebolo, M. Reinecke, C. Renault, S. Ricciardi, T. Riller, I. Ristorcelli, G. Rocha, J.A. Rubiño-Martín, E. Saar, M. Sandri, G. Savini, B.M. Schaefer, D. Scott, G.F. Smoot, J.-L. Starck, D. Sutton, J.-F. Sygnet, J.A. Tauber, L. Terenzi, L. Toffolatti, M. Tomasi, M. Tristram, M. Türler, L. Valenziano, P. Vielva, F. Villa, N. Vittorio, L.A. Wade, B.D. Wandelt, J. Weller, S.D.M. White, M. White, D. Yvon, A. Zacchei, A. Zonca

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Abstract

We present first results on PLCKG266.6-27.3, a galaxy cluster candidate detected at a signal-to-noise ratio of 5 in the Planck All Sky survey. An XMM-Newton validation observation has allowed us to confirm that the candidate isa bona fide galaxy cluster. With these X-ray data we measure an accurate redshift, z = 0.94 ± 0.02, and estimate the cluster mass to be M500= (7.8 ± 0.8) × 1014M. PLCKG266.6-27.3 is an exceptional system: its luminosity of LX[0.5-2.0 keV] = (1.4 ± 0.05) × 1045erg s-1equals that of the two most luminous known clusters in the z > 0.5 universe, and it is one of the most massive clusters at z ~ 1. Moreover, unlike the majority of high-redshift clusters, PLCKG266.6-27.3 appears to be highly relaxed. This observation confirms Planck's capability of detecting high-redshift, high-mass clusters, and opens the way to the systematic study of population evolution in the exponential tail of the mass function. © ESO, 2011.
Original languageEnglish
Article numberA26
Pages (from-to)-
JournalAstronomy and Astrophysics
Volume536
DOIs
Publication statusPublished - 2011
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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