Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104.2078o&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 104, no. 6, p. 2078-2085.
Astronomy and Astrophysics
Astronomy
23
Disk Galaxies, Galactic Clusters, Galactic Rotation, Galactic Structure, Astronomical Models, Astronomical Spectroscopy, Dynamic Models, Two Body Problem, Velocity Distribution
Scientific paper
The radial velocities of 75 galaxies in the field of Abell 2107 were measured within the framework of a program to study the kinematics of cD clusters of galaxies. Sixty-eight of these galaxies are cluster members. The mean observed velocity of A2107 is 12335 +/- 86 km/s, and the velocity dispersion is 672 +67/-52 km/s. The cD galaxy has a peculiar velocity of 270 km/s with respect to the cluster mean. The distribution of velocities is well fitted by a Gaussian, but the velocities are spatially correlated. Simple two-body subcluster models for A2107 are investigated; they are found to be consistent with the observed data and to account for the peculiar velocity of the cD galaxy. Alternatively, the spatial distribution of the velocities is also consistent with rotation of the single cluster at the 98-percent confidence level.
Hill John M.
Oegerle William R.
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