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 language | English |
|---|---|
| Article number | 143 |
| Journal | Astrophysical Journal |
| Volume | 874 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 2019 Apr 1 |
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All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science
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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 journal › Article
TY - JOUR
T1 - Multiwavelength Analysis of the Merging Galaxy Cluster A115
AU - Kim, Mincheol
AU - Jee, M. James
AU - Finner, Kyle
AU - Golovich, Nathan
AU - Wittman, David M.
AU - Weeren, R. J.Van
AU - Dawson, W. A.
PY - 2019/4/1
Y1 - 2019/4/1
N2 - 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.
AB - 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.
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U2 - 10.3847/1538-4357/ab0d7c
DO - 10.3847/1538-4357/ab0d7c
M3 - Article
AN - SCOPUS:85064436434
VL - 874
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 2
M1 - 143
ER -