The Sunyaev-Zel'dovich effect in WMAP data

Abstract

Using WMAP 5 year data, we look for the average Sunyaev-Zel'dovich effect (SZE) signal from clusters of galaxies by stacking the regions around hundreds of known X-ray clusters. We detect the average SZE at a very high significance level. The average cluster signal is spatially resolved in the W band. This mean signal is compared with the expected signal from the same clusters calculated on the basis of archival ROSAT data. From the comparison we conclude that the observed SZE seems to be less than the expected signal derived from X-ray measurements when a standard beta-model is assumed for the gas distribution. This conclusion is model dependent. Our predictions depend mostly on the assumptions made about the core radius of clusters and the slope of the gas density profile. Models with steeper profiles are able to simultaneously fit both X-ray and WMAP data better than a beta-model. However, the agreement is not perfect and we find that it is still difficult to make the X-ray and SZE results agree. A model assuming point source contamination in SZE clusters renders a better fit to the one-dimensional SZE profiles thus suggesting that contamination from point sources could be contributing to a diminution of the SZE signal. Selecting a model that better fits both X-ray and WMAP data away from the very central region, we estimate the level of contamination and find that on average, the point source contamination is on the level of 16 mJy (at 41 GHz), 26 mJy (at 61 GHz) and 18 mJy (at 94 GHz). These estimated fluxes are marginally consistent with the estimated contamination derived from radio and infrared surveys thus suggesting that the combination of a steeper gas profile and the contribution from point sources allows us to consistently explain the X-ray emission and SZE in galaxy clusters as measured by ROSAT and WMAP.

17 pages and 17 figures. Submited to MNRAS

References in corpus (17)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Data Processing, Sky Maps, and Basic Results
• Chandra temperature profiles for a sample of nearby relaxed galaxy clusters
• The origin of cold fronts in the cores of relaxed galaxy clusters
• An Imprint of Super-Structures on the Microwave Background due to the Integrated Sachs-Wolfe Effect
• A 1200-micron MAMBO survey of the GOODS-N field: a significant population of submillimetre drop-out galaxies
• X-ray and Sunyaev-Zel'dovich scaling relations in galaxy clusters
• Missing Thermal Energy of the Intracluster Medium
• Radio Sources Toward Galaxy Clusters at 30 GHz
• An X-ray/optical study of the complex dynamics of the core of the massive intermediate-redshift cluster MACSJ0717.5+3745
• The SCUBA Half-Degree Extragalactic Survey (SHADES) - VIII. The Nature of Faint Submm Galaxies in SHADES, SWIRE and SXDF Surveys
• Measurement of the electron-pressure profile of galaxy clusters in Wilkinson Microwave Anisotropy Probe (WMAP) 3-year data
• The Beta-Model Problem: The Incompatibility of X-ray and Sunyaev-Zeldovich Effect Model Fitting for Galaxy Clusters
• A study of the Sunyaev-Zel'dovich increment using archival SCUBA data
• A phenomenological model of galaxy clusters
• Anomalous SZ Contribution to 3 Year WMAP Data
• The diffuse soft excess emission in the Coma cluster from the ROSAT All-Sky Survey
• Scaling Relation between Sunyaev-Zel'dovich Effect and X-ray Luminosity and Scale-Free Evolution of Cosmic Baryon Field

Cited by in corpus (21)

• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• The universal galaxy cluster pressure profile from a representative sample of nearby systems (REXCESS) and the Y_SZ-M_500 relation
• Planck Early Results. X. Statistical analysis of Sunyaev-Zeldovich scaling relations for X-ray galaxy clusters
• Planck 2015 results. XXIII. The thermal Sunyaev-Zeldovich effect--cosmic infrared background correlation
• Comparison of Pressure Profiles of Massive Relaxed Galaxy Clusters using Sunyaev-Zel'dovich and X-ray Data
• Measuring the Galaxy Cluster Bulk Flow from WMAP data
• Planck intermediate results. VIII. Filaments between interacting clusters
• The WIRCAM Deep Infrared Cluster Survey I: Groups and Clusters at z > 1.1
• A Measurement of the Millimeter Emission and the Sunyaev-Zel'dovich Effect Associated with Low-Frequency Radio Sources
• Measuring the Thermal Sunyaev-Zel'dovich Effect Through the Cross Correlation of Planck and WMAP Maps with ROSAT Galaxy Cluster Catalogs
• The Ysz--Yx Scaling Relation as Determined from Planck and Chandra
• Cosmology with the pairwise kinematic SZ effect: Calibration and validation using hydrodynamical simulations
• Constraints on AGN feedback from its Sunyaev-Zel'dovich imprint on the cosmic background radiation
• Cosmological constraints from the observed angular cross-power spectrum between Sunyaev-Zel'dovich and X-ray surveys
• The cosmological free-free signal from galaxy groups and clusters
• The Sunyaev-Zeldovich Signal of the maxBCG SDSS Galaxy Clusters in WMAP
• On the DM interpretation of the origin of non-thermal phenomena in galaxy clusters
• Testing the WMAP cosmology via Planck radio catalogues
• Statistics of WMAP ILC map temperature fluctuations towards distant radio galaxies
• A CMB Gibbs sampler for localized secondary anisotropies
• Northern Hemisphere UHECR data further supports CMBR photons with weak U(1) component