CaltechAUTHORS
  A Caltech Library Service

Frontier Fields Clusters: Deep Chandra Observations of the Complex Merger MACS J1149.6+2223

Ogrean, G. A. and Zitrin, A. and Sayers, J. (2016) Frontier Fields Clusters: Deep Chandra Observations of the Complex Merger MACS J1149.6+2223. Astrophysical Journal, 819 (2). Art. No.113. ISSN 0004-637X. doi:10.3847/0004-637X/819/2/113. https://resolver.caltech.edu/CaltechAUTHORS:20160408-110524170

[img] PDF - Published Version
See Usage Policy.

3MB
[img] PDF - Submitted Version
See Usage Policy.

5MB

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20160408-110524170

Abstract

The Hubble Space Telescope Frontier Fields cluster MACS J1149.6+2223 is one of the most complex merging clusters, believed to consist of four dark matter halos. We present results from deep (365 ks) Chandra observations of the cluster, which reveal the most distant cold front (z = 0.544) discovered to date. In the cluster outskirts, we also detect hints of a surface brightness edge that could be the bow shock preceding the cold front. The substructure analysis of the cluster identified several components with large relative radial velocities, thus indicating that at least some collisions occur almost along the line of sight. The inclination of the mergers with respect to the plane of the sky poses significant observational challenges at X-ray wavelengths. MACS J1149.6+2223 possibly hosts a steep-spectrum radio halo. If the steepness of the radio halo is confirmed, then the radio spectrum, combined with the relatively regular ICM morphology, could indicate that MACS J1149.6+2223 is an old merging cluster.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.3847/0004-637X/819/2/113DOIArticle
http://iopscience.iop.org/article/10.3847/0004-637X/819/2/113/metaPublisherArticle
http://arxiv.org/abs/1603.06010arXivDiscussion Paper
ORCID:
AuthorORCID
Zitrin, A.0000-0002-0350-4488
Sayers, J.0000-0002-8213-3784
Additional Information:© 2016 The American Astronomical Society. Received 2015 September 8; accepted 2015 November 25; published 2016 March 4. We thank the referee for constructive comments. G.A.O. acknowledges support by NASA through a Hubble Fellowship grant HST-HF2-51345.001-A awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Incorporated, under NASA contract NAS5-26555. R.J.v.W. was supported by NASA through the Einstein Postdoctoral grant number PF2-130104 awarded by the Chandra X-ray Center, which is operated by the Smithsonian Astrophysical Observatory for NASA, under contract NAS8-03060. R.J.v.W. is supported by a Clay Fellowship awarded by the Harvard-Smithsonian Center for Astrophysics. A.Z. acknowledges support by NASA through a Hubble Fellowship grant HST-HF2-51334.001-A awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Incorporated, under NASA contract NAS5-26555. This research was performed while T.M. held a National Research Council Research Associate ship Award at the Naval Research Laboratory (NRL). F.A.S. acknowledges support from Chandra grant G03-14131X. Part of this work was performed under the auspices of the U.S. DOE by LLNL under contract DE-AC52-07NA27344. This research made use of NASA’s Astrophysics Data System. This research also made use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This research made use of APLpy, an open-source plotting package for Python hosted at http://aplpy.github.com. Some of the cosmological parameters in this paper were calculated using Ned Wright’s cosmology calculator (Wright 2006). The scientific results reported in this article are based on observations made by the Chandra X-ray Observatory. Facility: CXO (ACIS).
Funders:
Funding AgencyGrant Number
NASA Hubble FellowshipHST-HF2-51345.001-A
NASANAS5-26555
NASA Einstein Fellowship ProgramPF2-130104
NASANAS8-03060
Harvard-Smithsonian Center for AstrophysicsUNSPECIFIED
NASA Hubble FellowshipHST-HF2-51334.001-A
NASA ChandraG03-14131X
Department of Energy (DOE)DE-AC52-07NA27344
NASA/JPL/CaltechUNSPECIFIED
Subject Keywords:galaxies: clusters: general; galaxies: clusters: individual (MACS J1149.6+2223) ; galaxies: clusters: intracluster medium
Issue or Number:2
DOI:10.3847/0004-637X/819/2/113
Record Number:CaltechAUTHORS:20160408-110524170
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20160408-110524170
Official Citation:G. A. Ogrean et al 2016 ApJ 819 113
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:66021
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:08 Apr 2016 22:23
Last Modified:10 Nov 2021 23:52

Repository Staff Only: item control page