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Astrophysics > Astrophysics of Galaxies

arXiv:2210.12165 (astro-ph)
[Submitted on 21 Oct 2022 (v1), last revised 1 Nov 2022 (this version, v2)]

Title:HST and HSC Weak-lensing Study of the Equal-mass Dissociative Merger CIZA J0107.7+5408

Authors:Kyle Finner, Scott W. Randall, M. James Jee, Elizabeth L. Blanton, Hyejeon Cho, Tracy E. Clarke, Simona Giacintucci, Paul Nulsen, Reinout van Weeren
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Abstract:A dissociative merger is formed by the interplay of ram pressure and gravitational forces, which can lead to a spatial displacement of the dark matter and baryonic components of the recently collided subclusters. CIZA J0107.7+5408 is a nearby (z=0.105) dissociative merger that hosts two X-ray brightness peaks and a bimodal galaxy distribution. Analyzing MMT/Hectospec observations, we investigate the line-of-sight and spatial distribution of cluster galaxies. Utilizing deep, high-resolution Hubble Space Telescope Advanced Camera for Surveys imaging and large field-of-view Subaru Hyper-Suprime-Cam observations, we perform a weak-lensing analysis of CIZA J0107.7+5408. Our weak-lensing analysis detects a bimodal mass distribution that is spatially consistent with the cluster galaxies but significantly offset from the X-ray brightness peaks. Fitting two NFW halos to the lensing signal, we find an equal-mass merger with subcluster masses of $M_{200,NE}=2.8^{+1.1}_{-1.1}\times10^{14}$ M$_\odot$ and $M_{200,SW}=3.1^{+1.2}_{-1.2}\times10^{14}$ M$_\odot$. Moreover, the mass-to-light ratios of the subclusters, $(M/L)_{NE}=571^{+89}_{-91}$ $M_\odot/L_{\odot,B}$ and $(M/L)_{SW}=564^{+87}_{-89}$ $M_\odot/L_{\odot,B}$, are found to be consistent with each other and within the range of mass-to-light ratios found for galaxy clusters.
Comments: 15 pages, 10 figures, accepted to ApJ
Subjects: Astrophysics of Galaxies (astro-ph.GA); Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Astrophysical Phenomena (astro-ph.HE)
Cite as: arXiv:2210.12165 [astro-ph.GA]
  (or arXiv:2210.12165v2 [astro-ph.GA] for this version)
  https://doi.org/10.48550/arXiv.2210.12165
arXiv-issued DOI via DataCite
Related DOI: https://doi.org/10.3847/1538-4357/ac9fd3
DOI(s) linking to related resources

Submission history

From: Kyle Finner [view email]
[v1] Fri, 21 Oct 2022 18:00:04 UTC (6,858 KB)
[v2] Tue, 1 Nov 2022 23:06:34 UTC (6,867 KB)
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