Multiwavelength Analysis of the Merging Galaxy Cluster A115

Mincheol Kim, M. James Jee, Kyle Finner, Nathan Golovich, David M. Wittman, R. J.Van Weeren, W. A. Dawson

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A115 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 present 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 shows 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 determine the masses of the northern and southern subclusters to be M 200 = 1.58 +0.56 -0.49 × 10 14 M and 3.15 +0.79 -0.71 × 10 14 M , respectively. Combining the two halos, we estimate the total cluster mass to be M 200 = 6.41 +1.08 -1.04 × 10 14 M at R 200 = 1.67 +0.10 -0.09 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.

Original languageEnglish
Article number143
JournalAstrophysical Journal
Volume874
Issue number2
DOIs
Publication statusPublished - 2019 Apr 1

Fingerprint

galaxies
halos
x rays
velocity structure
centroids
line of sight
collision
hydrodynamics
radio
collisions
analysis
estimates
modeling

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Kim, M., Jee, M. J., Finner, K., Golovich, N., Wittman, D. M., Weeren, R. J. V., & Dawson, W. A. (2019). Multiwavelength Analysis of the Merging Galaxy Cluster A115. Astrophysical Journal, 874(2), [143]. https://doi.org/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. In: Astrophysical Journal. 2019 ; Vol. 874, No. 2.
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Kim, M, Jee, MJ, Finner, K, Golovich, N, Wittman, DM, Weeren, RJV & Dawson, WA 2019, 'Multiwavelength Analysis of the Merging Galaxy Cluster A115', Astrophysical Journal, vol. 874, no. 2, 143. https://doi.org/10.3847/1538-4357/ab0d7c

Multiwavelength Analysis of the Merging Galaxy Cluster A115. / Kim, Mincheol; Jee, M. James; Finner, Kyle; Golovich, Nathan; Wittman, David M.; Weeren, R. J.Van; Dawson, W. A.

In: Astrophysical Journal, Vol. 874, No. 2, 143, 01.04.2019.

Research output: Contribution to journalArticle

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Kim M, Jee MJ, Finner K, Golovich N, Wittman DM, Weeren RJV et al. Multiwavelength Analysis of the Merging Galaxy Cluster A115. Astrophysical Journal. 2019 Apr 1;874(2). 143. https://doi.org/10.3847/1538-4357/ab0d7c