Proceedings of the Particle Physics and Early Universe Conference (PPEUC).
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1 Introduction 

The Sunyaev--Zel'dovich (S--Z) effect (Sunyaev & Zel'dovich (1980)) is a secondary anisotropy in the Cosmic Microwave Background (CMB), due to inverse-Compton scattering of CMB photons by the hot electron atmosphere which exists in the potential well of clusters of galaxies. In the Rayleigh-Jeans region of the CMB spectrum, this results in a decrement in the CMB. This signal is small, only 1 mK even for the richest clusters, and is also diffuse.

PPEUC Proceedings
Fri Jun 27 15:29:33 BST 1997