Pre- and post-processing of cluster galaxies out to $5\times R_{200}$: The extreme case of A2670

Abstract

We study galaxy interactions in the large scale environment around A2670, a massive ($M_{200}$ = $8.5\pm 1.2\times 10^{14}{\mathrm{M}}_{\odot }$) and interacting galaxy cluster at z = 0.0763. We first characterize the environment of the cluster out to 5$\times R_{200}$ 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 $\sim 21$ % of the cluster galaxies have clear signs of disturbances, with most of those ($\sim 60$ %) 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 $>4\times R_{200}$, 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 $5\times R_{200}$, motivating wide-area studies in larger cluster samples.

Accepted for publication in MNRAS

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