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The galaxy cluster YSZ - LX and YSZ - M relations from the WMAP 5-yr data

J.-B. Melin 1 J.G. Bartlett 2 J. Delabrouille 3 M. Arnaud 4 R. Piffaretti 4 G.W. Pratt 4
2 APC - Cosmologie
APC (UMR_7164) - AstroParticule et Cosmologie
3 APC-Gravitation - APC - Gravitation
APC (UMR_7164) - AstroParticule et Cosmologie, AEI - Max-Planck-Institut für Gravitationsphysik ( Albert-Einstein-Institut )
Abstract : We use multifrequency matched filters to estimate, in the WMAP 5-year data, the Sunyaev-Zel'dovich (SZ) fluxes of 893 ROSAT NORAS/REFLEX clusters spanning the luminosity range LX,[0.1-2.4] keV = 2 × 1041 - 3.5 × 1045 erg s-1. The filters are spatially optimised by using the universal pressure profile recently obtained from combining XMM-Newton observations of the REXCESS sample and numerical simulations. Although the clusters are individually only marginally detected, we are able to firmly measure the SZ signal (> 10σ) when averaging the data in luminosity/mass bins. The comparison between the bin-averaged SZ signal versus luminosity and X-ray model predictions shows excellent agreement, implying that there is no deficit in SZ signal strength relative to expectations from the X-ray properties of clusters. Using the individual cluster SZ flux measurements, we directly constrain the Y500-LX and Y500-M500 relations, where Y500 is the Compton y-parameter integrated over a sphere of radius r500. The Y500-M500 relation, derived for the first time in such a wide mass range, has a normalisation Y^*500 = [ 1.60 ± 0.19] ×10-3 arcmin2 at M500 = 3 × 1014 h-1 M_&sun;, in excellent agreement with the X-ray prediction of 1.54 × 10-3 arcmin2, and a mass exponent of α = 1.79 ± 0.17, consistent with the self-similar expectation of 5/3. Constraints on the redshift exponent are weak due to the limited redshift range of the sample, although they are compatible with self-similar evolution.
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Submitted on : Tuesday, June 19, 2012 - 4:22:53 PM
Last modification on : Monday, December 13, 2021 - 9:14:53 AM

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J.-B. Melin, J.G. Bartlett, J. Delabrouille, M. Arnaud, R. Piffaretti, et al.. The galaxy cluster YSZ - LX and YSZ - M relations from the WMAP 5-yr data. Astronomy and Astrophysics - A&A, EDP Sciences, 2011, 525, pp.A139. ⟨10.1051/0004-6361/201013999⟩. ⟨in2p3-00709900⟩



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