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Date and Time of the Query: 2018-11-17 T09:48:26 PST
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For refcode 1991AJ....101.1957W:
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Copyright by American Astronomical Society. Reproduced by permission
1991AJ....101.1957W VLA NEUTRAL HYDROGEN IMAGING OF COMPACT GROUPS OF GALAXIES. II. HCG 31, 44, AND 79 B. A. WILLIAMS Department of Physics and Astronomy, University of Delaware, Newark Delaware 19716 P. M. McMAHON AND J. H. van GORKOM Department of Astronomy, Columbia University, Box 52, Pupin Hall, 538 West 120th Street, New York, New York 10027 Received 27 July 1990; revised 19 February 1991 ABSTRACT We present images of the neutral hydrogen (H I) in the direction of the compact groups of galaxies, HCG 31, HCG 44, and HCG 79. In HCG 31 and HCG 79, emission is contained within clouds much larger than the galaxies as well as the entire group while the H I emission associated with HCG 44 is located within the individual galaxies. The H I morphology of these groups shows a clear physical association between the galaxies. A pattern may be emerging which describes their H I morphology. If compact groups are in the process of merging, we expect the smaller groups to be more evolved, i. e. nearer their coalescence. The least evolved group has H I gas that is still bound to the individual galaxies; although, clear signs of interaction are apparent in the gas. It is the more evolved groups that offer the surprising result. The individual "galaxies" which appear to be extremely small (dwarf) are embedded in a common envelope of gas. We observe the kinematics of the gas varying from ordered rotation in two groups to large systematic but apparently uncorrelated gradients in another.
Retrieve 17 NED objects in this reference.
Please click here for ADS abstract

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