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The Planck Collaboration measured the Sunyaev-Zel'dovich (SZ) decrement ofoptically selected clusters from the Sloan Digital Sky Survey, finding that itfalls significantly below expectations based on existing mass calibration ofthe maxBCG galaxy clusters. Resolving this tension requires either the data togo up, or the theoretical expectations to come down. Here, we use data from theWilkinson Microwave Anisotropy Probe (WMAP) to perform an independent estimateof the SZ decrement of maxBCG clusters. The recovered signal is consistent withthat obtained using Planck, though with larger error bars due to WMAP's largerbeam size and smaller frequency range. Nevertheless, this detection serves asan independent confirmation of the magnitude of the effect, and demonstratesthat the observed discrepancy must be theoretical in origin.

The Sunyaev-Zeldovich Signal of the maxBCG SDSS Galaxy Clusters in WMAP