Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...241..864w&link_type=abstract
Astrophysical Journal, Part 1, vol. 241, Nov. 1, 1980, p. 864-874. NASA-supported research.
Astronomy and Astrophysics
Astrophysics
55
Galactic Clusters, Microwave Emission, X Ray Sources, Brightness Temperature, Elliptical Galaxies, Hubble Constant
Scientific paper
The X-ray observations of the galaxy clusters Abell 2319 and 576 show a reduced temperature of the microwave background due to the Suniaev-Zeldovich effect. The X-ray maps indicate smooth emission in these clusters concentrated toward the optical center; the surface brightness in the 1-3 keV band falls with the inverse square of radius outside a small core, and fits the Hubble's law of optical surface brightness of elliptical galaxies. The low temperature indicates that in A576 (1) the core radius of the gravitational potential is two to three times larger than inferred from galaxy counts, (2) the temperature rises with radius over most of the cluster and falls to zero at large radii, and (3) the gas does not obey the equation of state.
Silk Joseph
White Simon D. M.
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