SZ in Planck
The Sunyaev Zeldovich effect (SZE) is the result of the compton inverse scattering of Cosmic Microwave Background (CMB) photon on hot electrons from the diffuse intra-Galaxy Cluster gas. The net result of the effect is a shift in energy of the photons going through Galaxy Clusters, leading to "holes" in the sky at frequencies lower than 217GHz and hot spot at higher frequencies.
The Planck satellite was specifically designed from the beginning to measure this effect. HFI and LFI carry an array of 72 detectors sensitive to a range of frequencies between roughly 25 and 1000 GHz.
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