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

Journal Article · Fri Jun 01 00:00:00 EDT 1990 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/168812· OSTI ID:6643738

David, L P; Arnaud, K A; Forman, W; Jones, C ^[1]

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1. Smithsonian Astrophysical Observatory, Cambridge, MA (USA)

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. 55 refs.

• OSTI ID: 6643738
• Journal Information: Astrophysical Journal; (USA), Vol. 356; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
GALAXY CLUSTERS
GALACTIC EVOLUTION
BRIGHTNESS
COSMIC GASES
INTERSTELLAR MAGNETIC FIELDS
LUMINOSITY
MASS
PROPORTIONAL COUNTERS
RADIO GALAXIES
X RADIATION
COSMIC RADIO SOURCES
ELECTROMAGNETIC RADIATION
FLUIDS
GALAXIES
GASES
IONIZING RADIATIONS
MAGNETIC FIELDS
MEASURING INSTRUMENTS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATION DETECTORS
RADIATIONS
640105* - Astrophysics & Cosmology- Galaxies