Chandra and JVLA Observations of HST Frontier Fields Cluster MACS J0717.5+3745
| Autor: | Paul Nulsen, Megan Donahue, William A. Dawson, Tony Mroczkowski, E. M. Churazov, Felipe Andrade-Santos, Alexey Vikhlinin, Georgiana A. Ogrean, Esra Bulbul, R. J. van Weeren, Jack Sayers, Annalisa Bonafede, Ralph P. Kraft, William R. Forman, Keiichi Umetsu, Connor J. J. Pearce, Scott W. Randall, Elke Roediger, Julian Merten, Adi Zitrin, Marcus Brüggen, Laurence P. David, Andy D. Goulding, Tracy Clarke, Piero Rosati, B. Mason, Christine Jones |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
galaxies: clusters: intracluster medium galaxies: clusters: individual (MACS J0717.5+3745) Radio galaxy Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Radio spectrum NO galaxies: clusters: individual (MACS J0717.5 | 3745) 0103 physical sciences Galaxy filament Cluster (physics) 010303 astronomy & astrophysics Galaxy cluster Astrophysics::Galaxy Astrophysics Physics High Energy Astrophysical Phenomena (astro-ph.HE) 010308 nuclear & particles physics Astronomy and Astrophysics radiation mechanisms: non-thermal Astrophysics - Astrophysics of Galaxies Cold front Radio halo Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) X-rays: galaxies: clusters Astrophysics - High Energy Astrophysical Phenomena Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | The Astrophysical Journal, 835(2), 197 |
| Popis: | 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, $\sim 0.7$ 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 presence of hot $\gtrsim 20$ keV ICM gas detected by Chandra near the relic location provides additional support for this re-acceleration scenario. 22 pages, 15 figures, accepted for publication in ApJ |
| Databáze: | OpenAIRE |
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