An Optical Analysis of the Merging Cluster Abell 3888
Abstract
In this paper we present new AAOmega spectroscopy of 254 galaxies within a 30' radius around Abell 3888. We combine these data with the existing redshifts measured in a one degree radius around the cluster and performed a substructure analysis. We confirm 71 member galaxies within the core of A3888 and determine a new average redshift and velocity dispersion for the cluster of 0.1535 +\- 0.0009 and 1181 +\- 197 km/s, respectively. The cluster is elongated along an East-West axis and we find the core is bimodal along this axis with two sub-groups of 26 and 41 members detected. Our results suggest that A3888 is a merging system putting to rest the previous conjecture about the morphological status of the cluster derived from X-ray observations. In addition to the results on A3888 we also present six newly detected galaxy over-densities in the field, three of which we classify as new galaxy clusters.
Keywords
Cite
@article{arxiv.1602.03756,
title = {An Optical Analysis of the Merging Cluster Abell 3888},
author = {S. Shakouri and M. Johnston-Hollitt and S. Dehghan},
journal= {arXiv preprint arXiv:1602.03756},
year = {2016}
}
Comments
17 pages, 17 figures, Accepted to MNRAS 11 Feb 2016