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Title:		Intergalactic gas in clusters of galaxies, the microwave background, and cosmology
Authors:		SIUNIAEV, R. A.; ZELDOVICH, IA. B.
Affiliation:		AB(Akademiia Nauk SSSR, Institut Kosmicheskikh Issledovanii, Moscow, USSR)
Journal:		Soviet Scientific Reviews, Section E: Astrophysics and Space Physics Reviews, vol. 1, 1981, p. 1-60. Translation.
Publication Date:		00/1981
Category:		Astrophysics
Origin:		STI
NASA/STI Keywords:		COSMIC GASES, COSMOLOGY, EXTRATERRESTRIAL RADIO WAVES, GALACTIC CLUSTERS, INTERGALACTIC MEDIA, RELIC RADIATION, EMISSION SPECTRA, MICROWAVES, POLARIZED ELECTROMAGNETIC RADIATION, RADIAL VELOCITY, RADIO ASTRONOMY, SPECTRUM ANALYSIS, X RAY ASTRONOMY
Bibliographic Code:		1981SSRvE...1....1S

Abstract

In principle, X-ray and radio observations may be used to measure the angular as well as the linear sizes of galaxies, and thereby to estimate their distance. This provides a new opportunity for evaluating the Hubble constant; clusters could act as calibrators for cosmological tests. In addition, it may be feasible to determine the peculiar velocity of clusters relative to the microwave background. This review considers such topics as observational data on rich clusters of galaxies, the interaction of the microwave background with hot intracluster gas, astrophysical information on galaxy clusters, the peculiar velocity of clusters, and the microwave background as a new ether. It is suggested that galaxy clusters may become the most valuable source of cosmological information.

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