Substructure Analysis of Selected Low Richness 2dFGRS Clusters of Galaxies
Abstract
Complementary one-, two-, and three-dimensional tests for detecting the presence of substructure in clusters of galaxies are applied to recently obtained data from the 2dF Galaxy Redshift Survey. The sample of 25 clusters used in this study includes 16 clusters not previously investigated for substructure. Substructure is detected at or greater than the 99% CL level in at least one test for 21 of the 25 clusters studied here. From the results, it appears that low richness clusters commonly contain subclusters participating in mergers. About half of the clusters have two or more components within 0.5 h^{-1} Mpc of the cluster centroid, and at least three clusters (Abell 1139, Abell 1663, and Abell S333) exhibit velocity-position characteristics consistent with the presence of possible cluster rotation, shear, or infall dynamics. The geometry of certain features is consistent with influence by the host supercluster environments. In general, our results support the hypothesis that low richness clusters relax to structureless equilibrium states on very long dynamical time scales (if at all).
Cite
@article{arxiv.astro-ph/0405021,
title = {Substructure Analysis of Selected Low Richness 2dFGRS Clusters of Galaxies},
author = {William S. Burgett and Michael M. Vick and David S. Davis and Matthew Colless and Roberto De Propris and Ivan Baldry and Carlton Baugh and Joss Bland-Hawthorn and Terry Bridges and Russell Cannon and Shaun Cole and Chris Collins and Warrick Couch and Nicholas Cross and Gavin Dalton and Simon Driver and George Efstathiou and Richard Ellis and Carlos Frenk and Karl Glazebrook and Edward Hawkins and Carole Jackson and Ofer Lahav and Ian Lewis and Stuart Lumsden and Steve Maddox and Darren Madgwick and Peder Norberg and John A. Peacock and Will Percival and Bruce Peterson and Will Sutherland and Keith Taylor},
journal= {arXiv preprint arXiv:astro-ph/0405021},
year = {2011}
}
Comments
Aceepted for publication in MNRAS; 54 pages, 43 figures, 7 tables