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Open Access item Planck early results. XII. Cluster Sunyaev-Zeldovich optical scaling relations

Authors:Barreiro, R. Belén
Diego, J. M.
Herranz, D.
López-Caniego, M.
Martínez-González, Enrique
Vielva, P.
Keywords:Galaxies: clusters: intracluster medium, Cosmic background radiation, Large-scale structure of Universe, Cosmology: observations, Galaxies: clusters: general
Issue Date:Dec-2011
Publisher:EDP Sciences
Citation:Astronomy and Astrophysics 536: A12 (2011)
Abstract:We present the Sunyaev-Zeldovich (SZ) signal-to-richness scaling relation (Y500 − N200) for the MaxBCG cluster catalogue. Employing a multi-frequency matched filter on the Planck sky maps, we measure the SZ signal for each cluster by adapting the filter according to weak-lensing calibrated mass-richness relations (N200 − M500). We bin our individual measurements and detect the SZ signal down to the lowest richness systems (N200 = 10) with high significance, achieving a detection of the SZ signal in systems with mass as low as M500 ≈ 5 × 1013 M⊙. The observed Y500 − N200 relation is well modeled by a power law over the full richness range. It has a lower normalisation at given N200 than predicted based on X-ray models and published mass-richness relations. An X-ray subsample, however, does conform to the predicted scaling, and model predictions do reproduce the relation between our measured bin-average SZ signal and measured bin-average X-ray luminosities. At fixed richness, we find an intrinsic dispersion in the Y500 − N200 relation of 60% rising to of order 100% at low richness. Thanks to its all-sky coverage, Planck provides observations for more than 13000 MaxBCG clusters and an unprecedented SZ/optical data set, extending the list of known cluster scaling laws to include SZ-optical properties. The data set offers essential clues for models of galaxy formation. Moreover, the lower normalisation of the SZ-mass relation implied by the observed SZ-richness scaling has important consequences for cluster physics and cosmological studies with SZ clusters.
Description:10 páginas, 6 figuras, 2 tablas.-- Planck Collaboration: et al.
Publisher version (URL):http://dx.doi.org/10.1051/0004-6361/201116489
URI:http://hdl.handle.net/10261/46427
ISSN:0004-6361
E-ISSNmetadata.dc.identifier.doi = DOI:1432-0746
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