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Title: Chandra and JVLA Observations of HST Frontier Fields Cluster MACS J0717.5+3745

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. Northwest 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 intracluster medium (ICM) from the direction of a galaxy filament to the southeast. We detect a density discontinuity north-northeast 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 active galactic nucleus lead into the large radio relic where the radio spectrum flattens again.more » This morphological connection between the NAT radio galaxy and relic provides evidence for re-acceleration (revival) of fossil electrons. The presence of hot ≳20 keV ICM gas detected by Chandra near the relic location provides additional support for this re-acceleration scenario.« less

Authors:
; ; ; ; ; ; ;  [1];  [2]; ;  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [10];  [11];  [12] more »; « less
  1. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
  2. Department of Physics, Stanford University, 382 Via Pueblo Mall, Stanford, CA 94305-4060 (United States)
  3. Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, D-21029 Hamburg (Germany)
  4. Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139 (United States)
  5. U.S. Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, D.C. 20375 (United States)
  6. Max Planck Institute for Astrophysics, Karl-Schwarzschild-Str. 1, D-85741, Garching (Germany)
  7. Lawrence Livermore National Lab, 7000 East Avenue, Livermore, CA 94550 (United States)
  8. Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824 (United States)
  9. Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544 (United States)
  10. National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903 (United States)
  11. Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH (United Kingdom)
  12. ESO—European Organization for Astronomical Research in the Southern Hemisphere, Karl-Schwarzschild-Str. 2, D-85748 Garching b. München (Germany)
Publication Date:
OSTI Identifier:
22663917
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 835; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCELERATION; DENSITY; ELECTRONS; GALAXY CLUSTERS; GALAXY NUCLEI; KEV RANGE; RADIO GALAXIES; SPECTRA; X RADIATION; X-RAY GALAXIES

Citation Formats

Van Weeren, R. J., Jones, C., Forman, W. R., Andrade-Santos, F., Pearce, Connor J. J., David, L., Kraft, R. P., Nulsen, P. E. J., Ogrean, G. A., Bonafede, A., Brüggen, M., Bulbul, E., Clarke, T. E., Churazov, E., Dawson, W. A., Donahue, M., Goulding, A., Mason, B., Merten, J., Mroczkowski, T., E-mail: rvanweeren@cfa.harvard.edu, and and others. Chandra and JVLA Observations of HST Frontier Fields Cluster MACS J0717.5+3745. United States: N. p., 2017. Web. doi:10.3847/1538-4357/835/2/197.
Van Weeren, R. J., Jones, C., Forman, W. R., Andrade-Santos, F., Pearce, Connor J. J., David, L., Kraft, R. P., Nulsen, P. E. J., Ogrean, G. A., Bonafede, A., Brüggen, M., Bulbul, E., Clarke, T. E., Churazov, E., Dawson, W. A., Donahue, M., Goulding, A., Mason, B., Merten, J., Mroczkowski, T., E-mail: rvanweeren@cfa.harvard.edu, & and others. Chandra and JVLA Observations of HST Frontier Fields Cluster MACS J0717.5+3745. United States. doi:10.3847/1538-4357/835/2/197.
Van Weeren, R. J., Jones, C., Forman, W. R., Andrade-Santos, F., Pearce, Connor J. J., David, L., Kraft, R. P., Nulsen, P. E. J., Ogrean, G. A., Bonafede, A., Brüggen, M., Bulbul, E., Clarke, T. E., Churazov, E., Dawson, W. A., Donahue, M., Goulding, A., Mason, B., Merten, J., Mroczkowski, T., E-mail: rvanweeren@cfa.harvard.edu, and and others. Wed . "Chandra and JVLA Observations of HST Frontier Fields Cluster MACS J0717.5+3745". United States. doi:10.3847/1538-4357/835/2/197.
@article{osti_22663917,
title = {Chandra and JVLA Observations of HST Frontier Fields Cluster MACS J0717.5+3745},
author = {Van Weeren, R. J. and Jones, C. and Forman, W. R. and Andrade-Santos, F. and Pearce, Connor J. J. and David, L. and Kraft, R. P. and Nulsen, P. E. J. and Ogrean, G. A. and Bonafede, A. and Brüggen, M. and Bulbul, E. and Clarke, T. E. and Churazov, E. and Dawson, W. A. and Donahue, M. and Goulding, A. and Mason, B. and Merten, J. and Mroczkowski, T., E-mail: rvanweeren@cfa.harvard.edu and and others},
abstractNote = {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. Northwest 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 intracluster medium (ICM) from the direction of a galaxy filament to the southeast. We detect a density discontinuity north-northeast 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 active galactic nucleus lead 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 ≳20 keV ICM gas detected by Chandra near the relic location provides additional support for this re-acceleration scenario.},
doi = {10.3847/1538-4357/835/2/197},
journal = {Astrophysical Journal},
number = 2,
volume = 835,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 2017},
month = {Wed Feb 01 00:00:00 EST 2017}
}