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Using WMAP 3-year data at the locations of close to $\sim 700$ X-ray selectedclusters we have detected the amplitude of the thermal Sunyaev-Zeldovich (TSZ)effect at the 15$\sigma$ level, the highest statistical significance reportedso far. Owing to the large size of our cluster sample, we are able to detectthe corresponding CMB distortions out to large cluster-centric radii. Theregion over which the TSZ signal is detected is, on average, four times largerin radius than the X-ray emitting region, extending to $\sim 3h_{70}^{-1}$Mpc.We show that an isothermal $\beta$ model does not fit the electron pressure atlarge radii; instead, the baryon profile is consistent with theNavarro-Frenk-White profile, expected for dark matter in the concordance$\Lambda$CDM model. The X-ray temperature at the virial radius of the clustersfalls by a factor $\sim 3-4$ from the central value, depending on the clusterconcentration parameter. Our results suggest that cluster dynamics at largeradii is dominated by dark matter and is well described by Newtonian gravity.

Measurement of the electron-pressure profile of galaxy clusters in Wilkinson Microwave Anisotropy Probe (WMAP) 3-year data