2023ApJ...942...23F -
Astrophys. J., 942, 23 (2023/January-1)
Hubble Space Telescope and Hyper-Suprime-Cam Weak-lensing Study of the Equal-mass Dissociative Merger CIZA J0107.7+5408.
FINNER K., RANDALL S.W., JEE M.J., BLANTON E.L., CHO H., CLARKE T.E., GIACINTUCCI S., NULSEN P. and VAN WEEREN R.
Abstract (from CDS):
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 Navarro-Frenk-White halos to the lensing signal, we find an equal-mass merger with subcluster masses of ${M}_{200,\mathrm{NE}}={2.8}_{-1.1}^{+1.1}\times {10}^{14}$M⊙ and ${M}_{200,{SW}}={3.1}_{-1.2}^{+1.2}\times {10}^{14}$M⊙. Moreover, the mass-to-light ratios of the subclusters, ${(M/L)}_{\mathrm{NE}}={571}_{-91}^{+89}\ {M}_{\odot }/{L}_{\odot ,B}$ and ${(M/L)}_{\mathrm{SW}}={564}_{-89}^{+87}\ {M}_{\odot }/{L}_{\odot ,B}$, are found to be consistent with each other and within the range of mass-to-light ratios found for galaxy clusters.
Abstract Copyright:
© 2022. The Author(s). Published by the American Astronomical Society.
Journal keyword(s):
Weak gravitational lensing - Galaxy clusters - Dark matter - Hubble Space Telescope
Status at CDS
:
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Simbad objects:
4
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