A ROSAT survey of Hickson's compact galaxy groups

Details A ROSAT survey of Hickson's compact galaxy groups A ROSAT survey of Hickson's compact galaxy groups

1996-07-23

arxiv.org/abs/astro-ph/9607114v1

Mon.Not.Roy.Astron.Soc.283:690-708,1996

Astronomy and Astrophysics

Astrophysics

25 pages, 16 postscript figures. Accepted for publication in MNRAS

Scientific paper

We report the results of an almost complete survey of the X-ray properties of Hickson's compact galaxy groups with the ROSAT PSPC. Diffuse X-ray emission is detected from 22 groups. We infer that hot intragroup gas is present in $\gtsimm 75\%$ of these systems and derive their X-ray luminosity function. 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. We argue that 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 $T\sim1$\keV, which may result from the action of galaxy winds.

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