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

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Aghanim, N., Arnaud, M., Ashdown, M., Aumont, J., Baccigalupi, C., Balbi, A., Banday, A.J., Barreiro, R.B., Bartelmann, M., Bartlett, J.G., Battaner, E., Benabed, K., Benoit, A., Bernard, J.-P., Bersanelli, M., Bhatia, R., Bock, J.J., Bonaldi, A., Bond, J.R., Borrill, J., Bouchet, F.R., Brown, M.L., Bucher, M., Burigana, C., Cabella, P., Cantalupo, C.M., Cardoso, J.-F., Carvalho, P., Catalano, A., Cayon, L., Challinor, A., Chamballu, A., Chiang, L.-Y., Chon, G., Christensen, P.R., Churazov, E., Clements, D.L., Colafrancesco, S., Colombi, S., Couchot, F., Coulais, A., Crill, B.P., Cuttaia, F., Da Silva, A., Dahle, H., Danese, L., De Bernardis, P., de Gasperis, G., de Rosa, A., de Zotti, G., Delabrouille, J., Delouis, J.-M., Desert, F.-X., Diego, J.M., Dolag, K., Donzelli, S., Dore, O., Dorl, U., Douspis, M., Dupac, X., Efstathiou, G., Enßlin, T.A., Finelli, F., Flores-Cacho, I., Forni, O., Frailis, M., Franceschi, E., Fromenteau, S., Galeotta, S., Ganga, K., Genova-Santos, R.T., Giard, M., Giardino, G., Giraud-Héraud, Y., Gonzalez-Nuevo, J., Gonzalez-Riestra, R., Gorski, K.M., Gratton, S., Gregorio, A., Grupposo, A., Harrison, D., Heinamaki, P., Henrot-Versille, S., Hernandez-Monteagudo, C., Herranz, D., Hildebrandt, S.R., Hivon, E., Hobson, M., Holmes, W.A., Hovest, W., Hoyland, R.J., Huffenberger, K.M., Hurier, G., Jaffe, A.H., Juvela, M., Keihanen, E., Keskitalo, R., Kisner, T.S., Kneissl, R., Knox, L., Kurki-Suonio, H., Lagache, G., Lamarre, J.-M., Lasenby, A., Laureijs, R.J., Lawrence, C.R., Le Jeune, M., Leach, S., Leonardi, R., Liddle, A., Linden-Vornle, M., Lopez-Caniego, M., Lubin, P.M., Macias-Perez, J.F., Maffei, B., Maino, D., Mandolesi, N., Mann, R., Maris, M., Marleau, F., Martinez-Gonzalez, E., Masi, S., Matarrese, S., Matthai, F., Mazzotta, P., Melchiorri, A., Melin, J.-B., Mendes, L., Mennella, A., Mitra, S., Miville-Deschenes, M.-A., Moneti, A., Montier, L., Morgante, G., Mortlock, D., Munshi, D., Murphy, J.Anthony, Naselsky, P., Natoli, P., Netterfield, C.B., Norgaard-Nielsen, H.U., Noviello, F., Novikov, D., Novikov, I., Osborne, S., Pajot, F., Pasian, F., Patanchon, G., Perdereau, O., Perotto, L., Perrotta, F., Piacentini, F., Piat, M., Pierpaoli, E., Piffaretti, R., Plaszczynski, S., Pointecouteau, E., Polenta, G., Ponthieu, N., Poutanen, T., Pratt, G.W., Prezeau, G., Prunet, S., Puget, J.-L., Rebolo, R., Reinecke, M., Renault, C., Ricciardi, S., Riller, T., Ristorcelli, I., Rocha, G., Rosset, C., Rubino-Martin, J.A., Rusholme, B., Saar, E., Sandri, M., Santos, D., Schaefer, B.M., Scott, D., Seiffert, M.D., Smoot, G.F., Starck, J.-L., Stivoli, F., Stolyarov, V., Sunyaev, R., Sygnet, J.-F., Tauber, J.A., Terenzi, L., Toffolatti, L., Tomasi, M., Torre, J.-P., Tristram, M., Tuovinen, J., Valenziano, L., Vibert, L., Vielva, P., Villa, F., Vittorio, N., Wandelt, B.D., White, S.D.M., Yvon, D., Zacchei, A. and Zonca, A. (2011) Planck early results. IX. XMM-Newton follow-up for validation of Planck cluster candidates. Astronomy & Astrophysics, 536 (A9). pp. 1-20. ISSN 0004-6361

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Abstract

We present the XMM-Newton follow-up for confirmation of Planck cluster candidates. Twenty-five candidates have been observed to date using snapshot (∼10 ks) 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.

Item Type:	Article
Additional Information:	© ESO 2011. The original publication is available at DOI: 10.1051/0004-6361/201116460
Keywords:	Planck Collaboration; cosmology; observations; galaxies; clusters; intracluster medium; cosmic background radiation; X-rays;
Academic Unit:	Faculty of Science and Engineering > Experimental Physics
Item ID:	3981
Depositing User:	Dr. Anthony Murphy
Date Deposited:	14 Nov 2012 17:05
Journal or Publication Title:	Astronomy & Astrophysics
Publisher:	EDP Sciences
Refereed:	Yes
Related URLs:	http://www.aanda.org/ http://publications.edpsciences.org/
URI:	https://mural.maynoothuniversity.ie/id/eprint/3981
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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

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