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Titlebook: Clusters and Groups of Galaxies; International Meetin F. Mardirossian,G. Giuricin,M. Mezzetti Book 1984 D. Reidel Publishing Company, Dordr

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Les Regions Externes des Galaxies Ne Sont Pas Orientees Au Hasard,Des halos (ou couronnes) peuvent être détectées autour d’un certain nombre de galaxies par:
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Kurt Magnus,Karl Popp,Walter Sextroredshifts. We describe two tests, a principal axes test and a velocity gradient test, which are especially useful for this purpose. We apply these tests to samples of clusters from the Abell catalog and search for evidence of disk-like or filamentary structures.
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Grundbegriffe und Darstellungsmittel,ut 6000 km/s, whilst the fifth, NGC 7320, has v~ 800 km/s. Several attempts of estimating the density of the “Stephan’s Quintet like” groups have been carried on, giving contradictory results about the evidence for a chance projection in the discordant redshift groups. (See e.g. 1,2,3).
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Book 1984n "Clusters of great interest. and Groups of Galaxies". The topics covered included the spatial distribution and the clustering of galaxies; the properties of Superclusters, Clusters and Groups of galaxies; radio and X-ray observations; the problem of unseen matter; theories concerning hierarchical
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