Data di Pubblicazione:
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.
Tipologia CRIS:
01.01 - Articolo in rivista
Elenco autori:
N., Aghanim; M., Arnaud; M., Ashdown; J., Aumont; C., Baccigalupi; A., Balbi; A. J., Banday; R. B., Barreiro; M., Bartelmann; J. G., Bartlett; E., Battaner; K., Benabed; A., Benoît; J. P., Bernard; M., Bersanelli; R., Bhatia; J. J., Bock; A., Bonaldi; J. R., Bond; J., Borrill; F. R., Bouchet; M. L., Brown; M., Bucher; C., Burigana; P., Cabella; C. M., Cantalupo; J. F., Cardoso; P., Carvalho; A., Catalano; L., Cayón; A., Challinor; A., Chamballu; L. Y., Chiang; G., Chon; P. R., Christensen; E., Churazov; D. L., Clements; S., Colafrancesco; S., Colombi; F., Couchot; A., Coulais; B. P., Crill; F., Cuttaia; A., Da Silva; H., Dahle; L., Danese; P., de Bernardis; G., de Gasperis; A., de Rosa; G., de Zotti; J., Delabrouille; J. M., Delouis; F. X., Désert; J. M., Diego; K., Dolag; S., Donzelli; O., Doré; U., Dörl; M., Douspis; X., Dupac; G., Efstathiou; T. A., Enßlin; F., Finelli; I., Flores Cacho; O., Forni; M., Frailis; E., Franceschi; S., Fromenteau; S., Galeotta; K., Ganga; R. T., Génova Santos; M., Giard; G., Giardino; Y., Giraud Héraud; J., González Nuevo; R., González Riestra; K. M., Górski; S., Gratton; A., Gregorio; A., Gruppuso; D., Harrison; P., Heinämäki; S., Henrot Versillé; C., Hernández Monteagudo; D., Herranz; S. R., Hildebrandt; E., Hivon; M., Hobson; W. A., Holmes; W., Hovest; R. J., Hoyland; K. M., Huffenberger; G., Hurier; A. H., Jaffe; M., Juvela; E., Keihänen; R., Keskitalo; T. S., Kisner; R., Kneissl; L., Knox; H., Kurki Suonio; G., Lagache; J. M., Lamarre; A., Lasenby; R. J., Laureijs; C. R., Lawrence; M., Le Jeune; S., Leach; R., Leonardi; A., Liddle; M., Linden Vørnle; M., López Caniego; P. M., Lubin; J. F., Macías Pérez; B., Maffei; D., Maino; N., Mandolesi; R., Mann; M., Maris; F., Marleau; E., Martínez González; S., Masi; Matarrese, Sabino; F., Matthai; P., Mazzotta; A., Melchiorri; J. B., Melin; L., Mendes; A., Mennella; S., Mitra; M. A., Miville Deschênes; A., Moneti; L., Montier; G., Morgante; D., Mortlock; D., Munshi; A., Murphy; P., Naselsky; P., Natoli; C. B., Netterfield; H. U., Nørgaard Nielsen; F., Noviello; D., Novikov; I., Novikov; S., Osborne; F., Pajot; F., Pasian; G., Patanchon; O., Perdereau; L., Perotto; F., Perrotta; F., Piacentini; M., Piat; E., Pierpaoli; R., Piffaretti; S., Plaszczynski; E., Pointecouteau; G., Polenta; N., Ponthieu; T., Poutanen; G. W., Pratt; G., Prézeau; S., Prunet; J. L., Puget; R., Rebolo; M., Reinecke; C., Renault; S., Ricciardi; T., Riller; I., Ristorcelli; G., Rocha; C., Rosset; J. A., Rubiño Martín; B., Rusholme; E., Saar; M., Sandri; D., Santos; B. M., Schaefer; D., Scott; M. D., Seiffert; G. F., Smoot; J. L., Starck; F., Stivoli; V., Stolyarov; R., Sunyaev; J. F., Sygnet; J. A., Tauber; L., Terenzi; L., Toffolatti; M., Tomasi; J. P., Torre; M., Tristram; J., Tuovinen; L., Valenziano; L., Vibert; P., Vielva; F., Villa; N., Vittorio; B. D., Wandelt; S. D. M., White; D., Yvon; A., Zacchei; A., Zonca
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