Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...206...27v&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 206, no. 1, Nov. 1988, p. 27-40.
Astronomy and Astrophysics
Astrophysics
38
Galactic Clusters, Galactic Structure, Interacting Galaxies, Dark Matter, Galactic Nuclei, Red Shift, Velocity Distribution
Scientific paper
A systematic study of a morphologically-selected sample of dumbbell galaxies is presented. A dumbbell/multiple nuclei subclassification scheme is introduced. The single-object velocity dispersion of dumbbell components in Abell-type clusters is 436 + or - 88 km/sec, which is significantly smaller than that of normal cluster galaxies and of multiple nuclei systems. A detailed analysis of this sample, taking into account various projection effects, indicates that the two components of dumbbell pairs are physically associated, and probably in circular orbits around a common center. A relative rotation velocity of 1200 km/sec at a separation of 40 kpc is indicated. This translates into a single-object velocity of 600 km, intermediate between the typical rotation velocity in the central part of a cD galaxy and that in the cluster-at-large. Furthermore, the rotation curve appears to be rising in this radial range. The data provide direct evidence of the existence of a dark intracluster medium on a scale of 20-50 kpc.
Casertano Sefano
Valentijn Edwin. A.
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