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Date and Time of the Query: 2019-03-18 T23:14:09 PDT
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For refcode 2002AJ....123.3018M:
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2002AJ....123.3018M REDSHIFTS FOR A SAMPLE OF RADIO-SELECTED POOR CLUSTERS NEAL A. MILLER Laboratory for Astronomy and Solar Physics, Code 681, NASA Goddard Space Flight Center, Greenbelt, MD 20771; nmiller@stis.gsfc.nasa.gov MICHAEL J. LEDLOW Gemini Observatory Southern Operations Center, c/o AURA, Inc., Casilla 603, La Serena, Chile; mledlow@gemini.edu FRAZER N. OWEN National Radio Astronomy Observatory, P.O. Box O, Socorro, NM 87801; fowen@aoc.nrao.edu AND JOHN M. HILL Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721-0065; jhill@as.arizona.edu Received 2002 January 11; accepted 2002 March 14 ABSTRACT Multifiber optical spectroscopy has been performed on galaxies in the vicinity of strong, nearby radio galaxies. These radio galaxies were selected from the 3CR and B2 catalogs based on their exclusion from the Abell catalog, which is puzzling given the hypothesis that an external medium is required to confine the radio plasma of such galaxies. Velocities derived from the spectra were used to confirm the existence of groups and poor clusters in the fields of most of the radio galaxies. We find that all radio galaxies with classical Fanaroff-Riley type I morphologies prove to reside in clusters, whereas the other radio galaxies often appear to be recent galaxy-galaxy mergers in regions of low galaxy density. These findings confirm the earlier result that the existence of extended X-ray emission combined with a statistical excess of neighboring galaxies can be used to identify poor clusters associated with radio galaxies. Key words: galaxies: active - galaxies: clusters: general - galaxies: distances and redshifts
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