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Redshifts for a Sample of Radio-Selected Poor ClustersMultifiber 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.
Document ID
20020082932
Acquisition Source
Headquarters
Document Type
Preprint (Draft being sent to journal)
Authors
Miller, Neal A. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Ledlow, Michael J. (Gemini Observatory La Serena Chile)
Owen, Frazer N. (National Radio Astronomy Observatory Socorro, NM United States)
Hill, John M. (Arizona Univ. Tucson, AZ United States)
Rabin, Douglas M.
Date Acquired
September 7, 2013
Publication Date
June 1, 2002
Subject Category
Astronomy
Funding Number(s)
CONTRACT_GRANT: NAGW-2166
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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