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Title: Multiwavelength Analysis of the Merging Galaxy Cluster A115

Abstract

115 is a merging galaxy cluster at z ~ 0.2 with a number of remarkable features, including a giant (~2.5 Mpc) radio relic, two asymmetric X-ray peaks with trailing tails, and a peculiar line-of-sight velocity structure. We introduce a multiwavelength study of A115 using optical imaging data from Subaru, X-ray data from Chandra, and spectroscopic data from the Keck/DEIMOS and MMT/Hectospec instruments. Our weak-lensing (WL) analysis reflects that the cluster is composed of two subclusters whose mass centroids are in excellent agreement with the two brightest cluster galaxy positions (≲10''). By modeling A115 with a superposition of two Navarro–Frenk–White halos, we observe the masses of the northern and southern subclusters to be $${M}_{200}={1.58}_{-0.49}^{+0.56}\times {10}^{14}\,{M}_{\odot }$$ and $${3.15}_{-0.71}^{+0.79}\times {10}^{14}\,{M}_{\odot }$$, respectively. Combining the two halos, we estimate the total cluster mass to be $${M}_{200}={6.41}_{-1.04}^{+1.08}\times {10}^{14}\,{M}_{\odot }$$ at $${R}_{200}={1.67}_{-0.09}^{+0.10}$$ Mpc. These WL masses are significantly (a factor of 3–10) lower than what is implied by the X-ray and optical spectroscopic data. We attribute the difference to the gravitational and hydrodynamic disruption caused by the collision between the two subclusters.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [3]
  1. Yonsei Univ., Seoul (Korea, Republic of)
  2. Yonsei Univ., Seoul (Korea, Republic of); Univ. of California, Davis, CA (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Univ. of California, Davis, CA (United States)
  5. Leiden Univ. (Netherlands)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); USDOE National Nuclear Security Administration (NNSA); National Research Foundation of Korea (NRF)
OSTI Identifier:
1545282
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 874; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
cosmological parameters; cosmology: observations; dark matter; gravitational lensing: weak; large-scale structure of universe

Citation Formats

Kim, Mincheol, Jee, M. James, Finner, Kyle, Golovich, Nathan, Wittman, David M., Weeren, R. J. van, and Dawson, W. A. Multiwavelength Analysis of the Merging Galaxy Cluster A115. United States: N. p., 2019. Web. doi:10.3847/1538-4357/ab0d7c.
Kim, Mincheol, Jee, M. James, Finner, Kyle, Golovich, Nathan, Wittman, David M., Weeren, R. J. van, & Dawson, W. A. Multiwavelength Analysis of the Merging Galaxy Cluster A115. United States. doi:10.3847/1538-4357/ab0d7c.
Kim, Mincheol, Jee, M. James, Finner, Kyle, Golovich, Nathan, Wittman, David M., Weeren, R. J. van, and Dawson, W. A. Tue . "Multiwavelength Analysis of the Merging Galaxy Cluster A115". United States. doi:10.3847/1538-4357/ab0d7c.
@article{osti_1545282,
title = {Multiwavelength Analysis of the Merging Galaxy Cluster A115},
author = {Kim, Mincheol and Jee, M. James and Finner, Kyle and Golovich, Nathan and Wittman, David M. and Weeren, R. J. van and Dawson, W. A.},
abstractNote = {115 is a merging galaxy cluster at z ~ 0.2 with a number of remarkable features, including a giant (~2.5 Mpc) radio relic, two asymmetric X-ray peaks with trailing tails, and a peculiar line-of-sight velocity structure. We introduce a multiwavelength study of A115 using optical imaging data from Subaru, X-ray data from Chandra, and spectroscopic data from the Keck/DEIMOS and MMT/Hectospec instruments. Our weak-lensing (WL) analysis reflects that the cluster is composed of two subclusters whose mass centroids are in excellent agreement with the two brightest cluster galaxy positions (≲10''). By modeling A115 with a superposition of two Navarro–Frenk–White halos, we observe the masses of the northern and southern subclusters to be ${M}_{200}={1.58}_{-0.49}^{+0.56}\times {10}^{14}\,{M}_{\odot }$ and ${3.15}_{-0.71}^{+0.79}\times {10}^{14}\,{M}_{\odot }$, respectively. Combining the two halos, we estimate the total cluster mass to be ${M}_{200}={6.41}_{-1.04}^{+1.08}\times {10}^{14}\,{M}_{\odot }$ at ${R}_{200}={1.67}_{-0.09}^{+0.10}$ Mpc. These WL masses are significantly (a factor of 3–10) lower than what is implied by the X-ray and optical spectroscopic data. We attribute the difference to the gravitational and hydrodynamic disruption caused by the collision between the two subclusters.},
doi = {10.3847/1538-4357/ab0d7c},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 874,
place = {United States},
year = {2019},
month = {4}
}

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