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An H I Census of Loose Groups of Galaxies

Published online by Cambridge University Press:  26 May 2016

D. J. Pisano
Affiliation:
NSF Distinguished International Postdoctoral Research Fellow, ATNF, P.O. Box 76, Epping NSW 1710, Australia
David G. Barnes
Affiliation:
School of Physics, Univ. of Melbourne, Victoria 3010, Australia
Brad K. Gibson
Affiliation:
Swinburne University of Technology, Centre for Astrophysics and Supercomputing, Mail # 31, P.O. Box 218, Hawthorn, Victoria 3122, Australia
Lister Staveley-Smith
Affiliation:
ATNF, P.O. Box 76, Epping NSW 1710, Australia
Ken C. Freeman
Affiliation:
RSAA, Mount Stromlo Observatory, Cotter Road, Weston, ACT 2611, Australia

Abstract

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We present results from our Parkes Multibeam H I survey of 3 loose groups of galaxies that are analogous to the Local Group. This is a survey of groups containing only spiral galaxies with mean separations of a few hundred kpc, and total areas of approximately 1 Mpc2; groups similar to our own Local Group. We present a census of the H I-rich objects in these groups down to a 1σ M HI sensitivity ~7×105 M , as well as the detailed properties of these detections from follow-up Compact Array observations. We found 7 new H I-rich members in the 3 groups, all of which have stellar counterparts and are, therefore, typical dwarf galaxies. The ratio of low-mass to high-mass gas-rich galaxies in these groups is less than in the Local Group meaning that the “missing satellite” problem is not unique. No high-velocity cloud analogs were found in any of the groups. If HVCs in these groups are the same as in the Local Group, this implies that HVCs must be located within ~300-400 kpc of the Milky Way.

Type
Part 1. Census
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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