Mon. Not. R. Astron. Soc., 400, 1962-1985 (2009/December-3)
Southern GEMS groups - II. HI distribution, mass functions and HI deficient galaxies.
KILBORN V.A., FORBES D.A., BARNES D.G., KORIBALSKI B.S., BROUGH S. and KERN K.
Abstract (from CDS):
We investigate the neutral hydrogen (Hi) content of 16 groups for which we have multiwavelength data including X-ray observations. Wide-field imaging of the groups was obtained with the 20-cm multibeam system on the 64-m Parkes telescope. We have detected 10 previously uncatalogued Hi sources, one of which has no visible optical counterpart. We examine the Hi properties of the groups, compared to their X-ray characteristics, finding that those groups with a higher X-ray temperature and luminosity contain less Hi per galaxy. The Hi content of a group depends on its morphological make-up, with those groups dominated by early-type galaxies containing the least total Hi. We determined the expected Hi for the spiral galaxies in the groups, and found that a number of the galaxies were Hi deficient. The Hi deficient spirals were found both in groups with and without a hot intragroup medium. The Hi deficient galaxies were not necessarily found at the centre of the groups, however, we did find that two-thirds of Hi deficient galaxies were found within about 1Mpc from the group centre, indicating that the group environment is affecting the gas loss from these galaxies. We determined the Hi mass function for a composite sample of 15 groups, and found that it is significantly flatter than the field Hi mass function. We also find a lack of high Hi mass galaxies in groups. One possible cause of this effect is the tidal stripping of Hi gas from spiral galaxies as they are pre-processed in groups.
© 2009 The Authors. Journal compilation © 2009 RAS
galaxies: clusters: general - galaxies: evolution - galaxies: interactions - galaxies: luminosity function, mass function - X-rays: galaxies
VizieR on-line data:
<Available at CDS (J/MNRAS/400/1962): table2.dat tablea.dat tableb.dat>
Tables A1-A4, B1-B6: [BFK2006] GEMS-NNNNN-NN N=162, [BFK2006] GEMS-HCGNNN-NN N=12, [BFK2006] GEMS-ICNNNN-NN N=18.
some of the J2000 coordinates given in tables B1-7 seem to be misprinted , not in agreement with the optical position in NASA/IPAC Extragalactic Database (NED) and SIMBAD
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