2016ApJ...831..110G -
Astrophys. J., 831, 110-110 (2016/November-1)
MC2: dynamical analysis of the merging galaxy cluster MACS J1149.5+2223.
GOLOVICH N., DAWSON W.A., WITTMAN D., OGREAN G., VAN WEEREN R. and BONAFEDE A.
Abstract (from CDS):
We present an analysis of the merging cluster MACS J1149.5+2223 using archival imaging from Subaru/Suprime-Cam and multi-object spectroscopy from Keck/DEIMOS and Gemini/GMOS. We employ two- and three-dimensional substructure tests and determine that MACS J1149.5+2223 is composed of two separate mergers among three subclusters occurring ∼1 Gyr apart. The primary merger gives rise to elongated X-ray morphology and a radio relic in the southeast. The brightest cluster galaxy is a member of the northern subcluster of the primary merger. This subcluster is very massive (16.7–1.60+1.25×1014 M☉). The southern subcluster is also very massive (10.8–3.54+3.37×1014 M☉), yet it lacks an associated X-ray surface brightness peak, and it has been unidentified previously despite the detailed study of this Frontier Field cluster. A secondary merger is occurring in the north along the line of sight (LOS) with a third, less massive subcluster (1.20–0.34+0.19×1014 M☉). We perform a Monte Carlo dynamical analysis on the main merger and estimate a collision speed at pericenter of 2770–310+610 km s–1. We show the merger to be returning from apocenter with core passage occurring 1.16–0.25+0.50 Gyr before the observed state. We identify the LOS merging subcluster in a strong lensing analysis in the literature and show that it is likely bound to MACS J1149 despite having reached an extreme collision velocity of ∼4000 km s–1.
Abstract Copyright:
© 2016. The American Astronomical Society. All rights reserved.
Journal keyword(s):
galaxies: clusters: individual: MACS J1149.5+2223 - galaxies: distances and redshifts - large-scale structure of universe - large-scale structure of universe
Simbad objects:
7
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