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For refcode 1996MNRAS.283..690P:
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Copyright by Royal Astronomical Society. 1996MNRAS.283..690P A ROSAT survey of Hickson's compact galaxy groups T. J. Ponman, P. D. J. Bourner, H. Ebeling and H. Bohringer School of Physics and Space Research, University of Birmingham, Edgbaston, Birmingham B15 2TT Institute of Astronomy, Madingley Road Cambridge CB3 OHA Max-Planck-Institut fur Extraterrestrische Physik, D-85740 Garching Germany Accepted 1996 July 22. Received 1996 April 9; in original form 1995 December 12 ABSTRACT 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 > 75 per cent 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 indicates a significant steepening of the L-T relation below T ~ 1 keV, which may result from the action of galaxy winds. Key words: surveys - galaxies: clusters: general - intergalactic medium - X-rays: galaxies.
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