X-ray properties of compact galaxy groups.

Details X-ray properties of compact galaxy groups. X-ray properties of compact galaxy groups.

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996rftu.proc..357p&link_type=abstract

International Conference on X-ray Astronomy and Astrophysics: Röntgenstrahlung from the Universe, p. 357 - 360

Astronomy and Astrophysics

Astrophysics

2

Galaxy Groups: X Rays

Scientific paper

The authors report the results of the first near-complete survey of the X-ray properties of a well defined sample of galaxy groups: the collection of compact galaxy groups selected from the Palomar Sky Survey by Hickson (1982). Diffuse X-ray emission is detected from 22 groups and the authors infer that hot intragroup gas is present in at least 75% of these systems. Earlier reports that only spiral-poor systems exhibit diffuse X-ray emission are found to be incorrect. Strong correlations are found between the X-ray luminosity and both the gas temperature and the velocity dispersion of the group galaxies. These properties provide strong evidence that most of these groups are genuinely compact configurations, rather than line-of-sight superpositions. Comparison with the X-ray properties of galaxy clusters indicate a significant steepening of the L:T relation below T ≡ 1 keV, which may result from the action of galaxy winds.

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