NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-17 T10:38:04 PDT
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For refcode 1987ApJ...316..113O:
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Copyright by American Astronomical Society. Reproduced by permission
1987ApJ...316..113O Narrow-angle tail radio sources and the distribution of galaxy orbits in Abell clusters Christopher P. O'Dea, Craig L. Sarazin, and Frazer N. Owen Abstract. The present data on the orientations of the tails with respect to the cluster centers of a sample of 70 narrow-angle-tail (NAT) radio sources in Abell clusters show the distribution of tail angles to be inconsistent with purely radial or circular orbits in all the samples, while being consistent with isotropic orbits in (1) the whole sample, (2) the sample of NATs far from the cluster center, and (3) the samples of morphologically regular Abell clusters. Evidence for very radial orbits is found, however, in the sample of NATs near the cluster center. If these results can be generalized to all cluster galaxies, then the presence of radial orbits near the center of Abell clusters suggests that violent relaxation may not have been fully effective even within the cores of the regular clusters. Key words: GALACTIC CLUSTERS, GALACTIC EVOLUTION, GALACTIC RADIO WAVES, ORBITAL MECHANICS, RADIO SOURCES (ASTRONOMY), CIRCULAR ORBITS, GALACTIC STRUCTURE, RADIAL VELOCITY, RADIO ASTRONOMY, SPATIAL DISTRIBUTION
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