LoVoCCS. II. Weak Lensing Mass Distributions, Red-sequence Galaxy Distributions, and Their Alignment with the Brightest Cluster Galaxy in 58 Nearby X-Ray-luminous Galaxy Clusters

Journal Article · 04 October 2024 · The Astrophysical Journal

DOI: https://doi.org/10.3847/1538-4357/ad67c6 · OSTI ID:2455050

Fu, Shenming ; Dell’Antonio, Ian ; Escalante, Zacharias ; Nelson, Jessica ; Englert, Anthony ; Helhoski, Søren ; Shinde, Rahul ; Brockland, Julia; LaDuca, Philip; Larkin, Christelyn ; Paris, Lucca; Weiner, Shane; Black, William K. ; Chary, Ranga-Ram ; Clowe, Douglas ; Cooper, M. C. ; Donahue, Megan ; Evrard, August ; Lacy, Mark ; Lauer, Tod ; Liu, Binyang ; McCleary, Jacqueline ; Meneghetti, Massimo ; Miyatake, Hironao ; Montes, Mireia ; Natarajan, Priyamvada ; Ntampaka, Michelle ; Pierpaoli, Elena ; Postman, Marc ; Sohn, Jubee ; Turner, David ; Umetsu, Keiichi ; Utsumi, Yousuke ; Wilson, Gillian

Abstract The Local Volume Complete Cluster Survey is an ongoing program to observe nearly a hundred low-redshift X-ray-luminous galaxy clusters (redshifts 0.03 < z < 0.12 and X-ray luminosities in the 0.1–2.4 keV band L _X500c > 10 ⁴⁴ erg s ⁻¹ ) with the Dark Energy Camera, capturing data in the u , g , r , i , z bands with a 5 σ point source depth of approximately 25th–26th AB magnitudes. Here, we map the aperture masses in 58 galaxy cluster fields using weak gravitational lensing. These clusters span a variety of dynamical states, from nearly relaxed to merging systems, and approximately half of them have not been subject to detailed weak lensing analysis before. In each cluster field, we analyze the alignment between the 2D mass distribution described by the aperture mass map, the 2D red-sequence (RS) galaxy distribution, and the brightest cluster galaxy (BCG). We find that the orientations of the BCG and the RS distribution are strongly aligned throughout the interiors of the clusters: the median misalignment angle is 19° within 2 Mpc. We also observe the alignment between the orientations of the RS distribution and the overall cluster mass distribution (by a median difference of 32° within 1 Mpc), although this is constrained by galaxy shape noise and the limitations of our cluster sample size. These types of alignment suggest long-term dynamical evolution within the clusters over cosmic timescales.

• Sponsoring Organization: USDOE
• Grant/Contract Number: SC0017660
• OSTI ID: 2455050
• Journal Information: The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 1 Vol. 974; ISSN 0004-637X
• Publisher: American Astronomical SocietyCopyright Statement
• Country of Publication: United States
• Language: English