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Title:
Comptonization Of The Cosmic Microwave Background: The Sunyaev-Zeldovich Effect
Authors:
Rephaeli, Yoel
Publication:
Annual Review of Astronomy and Astrophysics, Volume 33, 1995, pp. 541-580. (Annual Reviews Homepage)
Publication Date:
00/1995
Origin:
ARA&A; KNUDSEN
DOI:
10.1146/annurev.aa.33.090195.002545
Bibliographic Code:
1995ARA&A..33..541R

Abstract

We review theoretical and observational work on Comptonization of the cosmic microwave background (CMB) radiation by hot gas in clusters of galaxies (the Sunyaev-Zeldovich effect). Uses of this important cosmological probe have been based on an approximate nonrelativistic treatment of the effect. An exact relativistic calculation, which is described in detail, is particularly important for the correct determinations of the Hubble constant and peculiar velocities of clusters. A number of studies of CMB anisotropy induced by clusters have been carried out; by most accounts this is predicted to constitute an appreciable component of the overall anisotropy on scales of a few arcminutes. Statistically significant detections of the effect in more than a dozen clusters are reviewed; in addition to the traditional single-dish radio measurements, these now include interferomtric observations with the Ryle and OVRO arrays and the high-frequency measurements with the SUZIE experiment. The combination of these and X-ray measurements yield a mean (unweighted) value of$58 \pm 6$ km s$^{-1}$ Mpc$^{-1}$ for the Hubble constant.

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