Yin-Zhe Ma, Gary Hinshaw, Douglas Scott
We examine the Sunyaev-Zeldovich effect in the 7-year WMAP data by cross-correlating it with the Planck Early-release Sunyaev-Zeldovich (ESZ) catalogue. Our analysis proceeds in two parts. We first perform a stacking analysis in which the filtered WMAP data are averaged at the locations of the 175 Planck clusters. We then perform a regression analysis to compare the mean amplitude of the SZ signal, $Y_{500}$, in the WMAP data to the corresponding amplitude in the Planck data. The aggregate Planck clusters are detected in the 7-year WMAP data with a signal to noise ratio of 16.3. In the regression analysis we find the that the SZ amplitude measurements agree to better than 25%: $a=1.23 \pm 0.18$ for the fit $Y^{WMAP}_{500} = aY^{Planck}_{500}$.
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http://arxiv.org/abs/1303.4728
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