NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2018-11-17 T09:43:40 PST
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For refcode 1988AJ.....95..352W:
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Copyright by American Astronomical Society. Reproduced by permission
1988AJ.....95..352W VLA OBSERVATIONS OF HYDROGEN IN HCG 18 B. A. WILLIAMS Department of Physics and Astronomy, University of Delaware, Sharp Laboratory, Newark, Delaware 19716 J. H. VAN GORKOM National Radio Astronomy Observatory, P. O. Box 0, Socorro, New Mexico 87801 Received 26 August 1987; revised 12 October 1987 ABSTRACT We present images of the neutral hydrogen (H I) in the direction of the compact group of galaxies HCG 18. This H I emission is identified with a single cloud, centered on the galaxies b, c, and d and smoothly distributed over a region twice the size of the compact group. The cloud appears to be in regular rotation with a period no longer than 8 X 10^8^ yr. The systematic velocity of the gas lies within 1{sigma} of the mean velocity of the group; however, the cloud is not clearly associated with any particular galaxy, but surrounds all three, which may be one irregular galaxy.
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