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

February 2024 • 2024ApJ...962..100H

Authors • 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.

Abstract • 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.

Links

• PDF https://iopscience.iop.org/article/10.3847/1538-4357/ad1bcc/pdf
• PREPRINT http://arxiv.org/abs/2311.00643
• ELECTR https://doi.org/10.3847%2F1538-4357%2Fad1bcc