J/AJ/104/2078 J/AJ/104/2078 Galaxies in Abell 2107 Field W R Oegerle J M Hill Astron. J. 104 2078 1992 1992AJ....104.2078O Galaxies Radial velocities 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 A2105 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. 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.

ID Identifying number --- RAh Right ascension J2000 h RAm Right ascension J2000 min RAs Right ascension J2000 s DEd Declination J2000 deg DEm Declination J2000 arcmin DES Declination J2000 arcsec cz Observed heliocentric-corrected velocity km/s Com Comments on the presence of emission lines and the galaxies used as correlation templates --- Patricia Bauer CDS 1994Jul06AAS CD-ROM series, Volume 1, 1993 J_AJ_104_2078.xml