Weak-lensing Analysis of the Complex Cluster Merger A746 with Subaru/Hyper Suprime-Cam

HyeongHan, K. ; Cho, H. ; Jee, M. James ; Wittman, D. ; Cha, S. ; Lee, W. ; Finner, K. ; Rajpurohit, K. ; Brüggen, M. ; Forman, W. ; Jones, C. ; van Weeren, R. ; Botteon, A. ; Lovisari, L. ; Stroe, A. ; Domínguez-Fernández, P. ; O'Sullivan, E. ; Vrtilek, J.

The galaxy cluster A746 (z = 0.214), featuring a double radio relic system, two isolated radio relics, a possible radio halo, disturbed V-shaped X-ray emission, and intricate galaxy distributions, is a unique and complex merging system. We present a weak-lensing analysis of A746 based on wide-field imaging data from Subaru/Hyper Suprime-Cam observations. The mass distribution is characterized by a main peak, which coincides with the center of the X-ray emission. At this main peak, we detect two extensions toward the north and west tracing the cluster galaxy and X-ray distributions. Despite the ongoing merger, our estimate of the A746 global mass M 500 = 4.4 ± 1.0 × 1014 M ⊙ is consistent with the previous results from Sunyaev-Zel'dovich and X-ray observations. We conclude that reconciling the distributions of mass, galaxies, and intracluster medium with the double radio relic system and other radio features remains challenging.

https://ui.adsabs.harvard.edu/abs/2024ApJ...962..100H/abstract