Einstein observations of the Hydra A cluster and the efficiency of galaxy formation in groups and clusters

Details Einstein observations of the Hydra A cluster and the efficiency of galaxy formation in groups and clusters Einstein observations of the Hydra A cluster and the efficiency of galaxy formation in groups and clusters

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...356...32d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 356, June 10, 1990, p. 32-40.

Astronomy and Astrophysics

Astrophysics

168

Galactic Clusters, Galactic Evolution, Radio Galaxies, Brightness Distribution, Gas Temperature, Interstellar Magnetic Fields, Luminosity, Proportional Counters, Stellar Mass

Scientific paper

The Einstein imaging proportional counter observations of the poor cluster of galaxies centered on the radio galaxy Hydra A are examined. From the surface brightness profile, it is found that the X-ray-emitting gas in the Hydra A cluster must be condensing out of the intracluster medium at a rate of 600 solar masses/yr. This is one of the largest mass deposition rates observed in a cluster of galaxies. The ratio of gas mass to stellar mass is compared for a variety of systems, showing that this ratio correlates with the gas temperature.

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