Pre- and post-processing of cluster galaxies out to : The extreme case of A2670
arXiv:2401.06973 · doi:10.1093/mnras/stad3957
Abstract
We study galaxy interactions in the large scale environment around A2670, a massive ( = ) and interacting galaxy cluster at z = 0.0763. We first characterize the environment of the cluster out to 5 and find a wealth of substructures, including the main cluster core, a large infalling group, and several other substructures. To study the impact of these substructures (pre-processing) and their accretion into the main cluster (post-processing) on the member galaxies, we visually examined optical images to look for signatures indicative of gravitational or hydrodynamical interactions. We find that % of the cluster galaxies have clear signs of disturbances, with most of those ( %) likely being disturbed by ram pressure. The number of ram-pressure stripping candidates found (101) in A2670 is the largest to date for a single system, and while they are more common in the cluster core, they can be found even at , confirming cluster influence out to large radii. In support of a pre-processing scenario, most of the disturbed galaxies follow the substructures found, with the richest structures having more disturbed galaxies. Post-processing also seems plausible, as many galaxy-galaxy mergers are seen near the cluster core, which is not expected in relaxed clusters. In addition, there is a comparable fraction of disturbed galaxies in and outside substructures. Overall, our results highlight the complex interplay of gas stripping and gravitational interactions in actively assembling clusters up to , motivating wide-area studies in larger cluster samples.
Accepted for publication in MNRAS
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