Structure, rotation, and the peculiar velocity cD galaxy in Abell 2107

Abstract

view Abstract Citations (38) References (27) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Structure, Rotation, and Peculiar Velocity cD Galaxy in ABELL 2107 Oegerle, William R. ; Hill, John M. Abstract As part of a program to study the kinematics of cD clusters of galaxies, we have measured the radial velocities of 75 galaxies in the field of Abell 2107. Sixty-eight of these galaxies are cluster members. The mean observed velocity of A2107 is 12335+/-86 km s^-1^ and the velocity dispersion is 672_-52_^+67^ km s^-1^. The cD galaxy has a peculiar velocity of 270 km s^-1^ with respect to the cluster mean. The distribution of velocities is well fitted by a Gaussian, but the velocities are spatially correlated. We have investigated simple two-body subcluster models for A2107, which are consistent with the observed data and account for the peculiar velocity of the cD galaxy. Alternatively the spatial distribution of velocities is also consistent with rotation of a single cluster at the 98% confidence level. However, the pure rotation model fails to explain the peculiar velocity of the cD galaxy which lies at the center of the cluster. Publication: The Astronomical Journal Pub Date: December 1992 DOI: 10.1086/116383 Bibcode: 1992AJ....104.2078O Keywords: Disk Galaxies; Galactic Clusters; Galactic Rotation; Galactic Structure; Astronomical Models; Astronomical Spectroscopy; Dynamic Models; Two Body Problem; Velocity Distribution; Astrophysics; GALAXIES: CLUSTERING; GALAXIES: INTERACTIONS full text sources ADS | data products SIMBAD (83) NED (75) CDS (1)