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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/71244
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- Southern GEMS groups II: HI distribution, mass functions and HI deficient galaxies
- Kilborn, Virginia A.; Forbes, Duncan A.; Barnes, David G.; Koribalski, Barbel S.; Brough, Sarah; Kern, Katie
- We investigate the neutral hydrogen (H i) 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 H i sources, one of which has no visible optical counterpart. We examine the H i properties of the groups, compared to their X-ray characteristics, finding that those groups with a higher X-ray temperature and luminosity contain less H i per galaxy. The H i content of a group depends on its morphological make-up, with those groups dominated by early-type galaxies containing the least total H i. We determined the expected H i for the spiral galaxies in the groups, and found that a number of the galaxies were H i deficient. The H i deficient spirals were found both in groups with and without a hot intragroup medium. The H i deficient galaxies were not necessarily found at the centre of the groups, however, we did find that two-thirds of H i deficient galaxies were found within about 1 Mpc from the group centre, indicating that the group environment is affecting the gas loss from these galaxies. We determined the H i mass function for a composite sample of 15 groups, and found that it is significantly flatter than the field H i mass function. We also find a lack of high H i mass galaxies in groups. One possible cause of this effect is the tidal stripping of H i gas from spiral galaxies as they are pre-processed in groups.
- Publication type
- Journal article
- Research centre
- Swinburne University of Technology. Faculty of Information and Communication Technologies. Centre for Astrophysics and Supercomputing
- Monthly Notices of the Royal Astronomical Society, Vol. 400, no. 4 (Dec 2009), pp. 1962-1985
- Publication year
- Wiley-Blackwell Publishing
- Publisher URL
- Copyright © 2009 The Authors. Journal compilation copyright © 2009 Royal Astronomical Society. Accepted manuscript of the paper reproduced here in accordance with the copyright policy of the publisher. The definitive version is available at http://www.interscience.wiley.com.