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. The American Astronomical Society. All rights reserved.
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.
- The University of Hull
- Peer reviewed
- 7 MB
- Journal title
- The astrophysical journal
- Publication date
- American Astronomical Society
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Copy of article first published in: The astrophysical journal, 2017, v.835, number 2, article number 197.
- Published article