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Frontier fields clusters: deep Chandra observations of the complex merger MACS~J1149.6+2223

Ogrean, G. A.; Van Weeren, R. J.; Jones, C.; Forman, W.; Dawson, W. A.; Golovich, N.; Andrade-Santos, F.; Murray, S. S.; Nulsen, P.; Roediger, E.; Zitrin, A.; Bulbul, E.; Kraft, R.; Goulding, A.; Umetsu, K.; Mroczkowski, T.; Bonafede, A.; Randall, S.; Sayers, J.; Churazov, E.; David, L.; Merten, J.; Donahue, M.; Mason, B.; Rosati, P.; Vikhlinin, A.; Ebeling, H.


G. A. Ogrean

R. J. Van Weeren

C. Jones

W. Forman

W. A. Dawson

N. Golovich

F. Andrade-Santos

S. S. Murray

P. Nulsen

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Dr Elke Roediger
Senior Lecturer/ Director of Studies for Physics

A. Zitrin

E. Bulbul

R. Kraft

A. Goulding

K. Umetsu

T. Mroczkowski

A. Bonafede

S. Randall

J. Sayers

E. Churazov

L. David

J. Merten

M. Donahue

B. Mason

P. Rosati

A. Vikhlinin

H. Ebeling


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.


Ogrean, G. A., Van Weeren, R. J., Jones, C., Forman, W., Dawson, W. A., Golovich, N., …Ebeling, H. (2016). Frontier fields clusters: deep Chandra observations of the complex merger MACS~J1149.6+2223. The Astrophysical journal, 819(2), 113-1-113-13.

Journal Article Type Article
Acceptance Date Nov 25, 2015
Online Publication Date Mar 4, 2016
Publication Date Mar 10, 2016
Deposit Date Mar 17, 2016
Publicly Available Date Mar 17, 2016
Journal The astrophysical journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 819
Issue 2
Pages 113-1-113-13
Keywords Galaxies : clusters : general, Galaxies : clusters : individual : MACS J1149.6+2223, Galaxies : clusters : intracluster medium
Public URL
Publisher URL;
Additional Information This is a copy of an article published in the astrophysical journal, 2016, v.819 issue 2.


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© 2016. The American Astronomical Society. All rights reserved

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