We present the weak lensing mass distribution of a triple merging cluster candidate at zphoto∼0.36 belonging to a supercluster recently discovered during the eROSITA Performance Verification phase. Our analysis solved a previous tension in the merger classification by confirming that the cluster pair eFEDS J093513.3+004746 and eFEDS J093510.7+004910 is undergoing a major merger with a mass ratio 1.7−0.7+0.5. According to our two-body kinematic description, the encounter happened 0.58−0.20+0.15 Gyr ago, in a scenario that supports the observed radio relic position at the cluster outskirts. However, the same analysis showed that the companion cluster, eFEDS J093501.1+005418, is not gravitationally bound to the interacting system and therefore it is not part of the supercluster. We also checked the impact of adopting a scaling relation to determine the halo concentration c200. At the observed merger stage, where the clusters have travelled ∼55 per cent of the path to reach the apoapsis, the choice of the c200 (whether from a scaling relation or a free parameter in the mass model) does not change significantly either the cluster masses or the kinematic description.
@article{arxiv.2207.02232,
title = {A major galaxy cluster merger caught by eROSITA: weak lensing mass distribution and kinematic description},
author = {Rogério Monteiro-Oliveira},
journal= {arXiv preprint arXiv:2207.02232},
year = {2022}
}