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

Publication: Research - peer-reviewJournal article – Annual report year: 2011

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  • Author: Ristorcelli, I.

  • Author: Bock, J.J.

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  • Author: Dahle, H.

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  • Author: Piffaretti, R.

  • Author: Starck, J.-L.

  • Author: Yvon, D.

  • Author: Linden-Vørnle, Michael

    National Space Institute, Technical University of Denmark, Elektrovej, 2800, Kgs. Lyngby, Denmark

  • Author: Nørgaard-Nielsen, Hans Ulrik

    Astrophysics, National Space Institute, Technical University of Denmark, Elektrovej, 2800, Kgs. Lyngby, Denmark

  • Author: Toffolatti, L.

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  • Author: Chon, G.

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  • Author: Murphy, A.

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  • Author: Naselsky, P.

  • Author: Novikov, I.

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  • Author: De Zotti, G.

  • Author: González-Nuevo, J.

  • Author: Leach, S.

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  • Author: Mann, R.

  • Author: Munshi, D.

  • Author: Churazov, E.

  • Author: Sunyaev, R.

  • Author: Borrill, J.

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  • Author: Bartelmann, M.

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  • Author: Banday, A.J.

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  • Author: Forni, O.

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  • Author: Ristorcelli, I.

  • Author: Battaner, E.

  • Author: Huffenberger, K.M.

  • Author: Górski, K.M.

View graph of relations

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, Y 500. 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. © ESO 2011.
Original languageEnglish
JournalAstronomy & Astrophysics
Publication date2011
Volume536
PagesA9
ISSN0004-6361
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 68
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