X-ray emission from compact groups of galaxies

Details X-ray emission from compact groups of galaxies X-ray emission from compact groups of galaxies

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...238l..59s&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 238, June 1, 1980, p. L59-L62.

Astronomy and Astrophysics

Astronomy

61

Emission Spectra, Galactic Clusters, Stellar Evolution, X Ray Sources, X Ray Spectra, Bremsstrahlung, Heao 1, Position (Location), Spaceborne Astronomy, Stellar Luminosity, Stellar Temperature

Scientific paper

The existence of very compact groups, or 'poor clusters,' of galaxies as a category of X-ray source is reported. By analogy with X-ray emission from clusters of galaxies, it is assumed that the extended X-ray emission is due to thermal bremsstrahlung from hot gas in the groups. The derived X-ray temperatures, luminosities, and sizes are similar to those for X-ray emitting, rich clusters of galaxies. It is inferred that these groups are in a late evolutionary stage because of the presence of a dominant galaxy, the absence of spiral galaxies, and the short cooling time inferred for 2A 0335 + 096.

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