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Date and Time of the Query: 2018-11-17 T09:54:23 PST
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For refcode 1990ApJ...365...86R:
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NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
1990ApJ...365...86R ONE GALAXY FROM SEVERAL: THE HICKSON COMPACT GROUP H31 VERA C. RUBIN Department of Terrestrial Magnetism, Carnegie Institution of Washington DEIDRE A. HUNTER3 Lowell Observatory, Flagstaff AND W. KENT FORD JR. Department of Terrestrial Magnetism, Carnegie Institution of Washington Received 1990 April 19; accepted 1990 June 8 ABSTRACT The compact group H31 was identified by Hickson in 1982; it consists of four galaxies in close proximity, at least two of which (A and C) are interacting. Our red and H{alpha} frames and long-slit spectroscopy identify at least three other close members of the group; an H I envelope (Williams et al.) encloses all galaxies. Nuclear spectra of galaxies A and C show velocity patterns characteristic of interacting galaxies as well as the broad 4650 A feature indicative of W-R stars. These features reveal that large numbers of massive stars formed more than 10^6.5^ yr ago. Other observed characteristics--complex morphology, tidal tails, total velocity range within the group of < 250 km s^-1^, irregular internal dynamics, and total red luminosity-- all suggest that H31 is in the process of merging to a single galaxy. H31 thus supports the computations of Barnes which indicate that galaxies in compact groups merge to form a single remnant. Subject headings: galaxies: clustering - galaxies: interactions - galaxies: internal motions - galaxies: stellar content
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