Chandra and JVLA observations of HST frontier fields cluster MACS J0717.5+3745

Weeren, Reinout Johannes van, 1980-; Ogrean, Georgiana A.; Jones, Christine (Astrophysicist); Forman, William (Astrophysicist); Andrade-Santos, Felipe; Pearce, Connor J. J.; Bonafede, Annalisa; Brüggen, Marcus, 1972-; Bulbul, Esra; Clarke, Tracy E.; Churazov, E. (Eugene), 1961-; David, L.; Dawson, William A.; Donahue, M. (Megan), 1962-; Goulding, Andrew D.; Kraft, Ralph P.; Mason, Brian D.; Merten, Julia; Mroczkowski, Tony; Nulsen, Paul E. J.; Rosati, Piero; Roediger, Elke, 1978-; Randall, Scott W.; Sayers, Jack; Umetsu, Keiichi; Vikhlinin, Aleksej; Zitrin, Adi

EA Milne Centre for Astrophysics
Galaxies -- clusters -- individual (MACS J0717.5+3745); Galaxies -- clusters -- intracluster medium; Radiation mechanisms -- non-thermal; X-rays -- galaxies -- clusters
2017

Journal article


Rights
© 2017. The American Astronomical Society. All rights reserved.
Abstract

To investigate the relationship between thermal and non-thermal components in merger galaxy clusters, we present deep JVLA and Chandra observations of the HST Frontier Fields cluster MACS J0717.5+3745. The Chandra image shows a complex merger event, with at least four components belonging to different merging subclusters. NW of the cluster, ~0.7 Mpc from the center, there is a ram-pressure-stripped core that appears to have traversed the densest parts of the cluster after entering the ICM from the direction of a galaxy filament to the SE. We detect a density discontinuity NNE of this core which we speculate is associated with a cold front. Our radio images reveal new details for the complex radio relic and radio halo in this cluster. In addition, we discover several new filamentary radio sources with sizes of 100-300 kpc. A few of these seem to be connected to the main radio relic, while others are either embedded within the radio halo or projected onto it. A narrow-angled-tailed (NAT) radio galaxy, a cluster member, is located at the center of the radio relic. The steep spectrum tails of this AGN leads into the large radio relic where the radio spectrum flattens again. This morphological connection between the NAT radio galaxy and relic provides evidence for re-acceleration (revival) of fossil electrons.

Publisher
The University of Hull
Peer reviewed
Yes
Language
English
Extent
7 MB
Identifier
hull:14372

Journal

Journal title
The astrophysical journal
Publication date
2017
Publisher
American Astronomical Society
DOI
10.3847/1538-4357/835/2/197
ISSN (Print)
0004-637X
ISSN (Electronic)
1538-4357
Volume
835
Issue
2
Notes

Copy of article first published in: The astrophysical journal, 2017, v.835, number 2, article number 197.

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