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Title: Deep Very Large Array Observations of the Merging Cluster CIZA J2242.8+5301: Continuum and Spectral Imaging

Journal Article · · The Astrophysical Journal (Online)
ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [4];  [5]; ORCiD logo [6];  [7];  [8]; ORCiD logo [9]; ORCiD logo [10];  [7]; ORCiD logo [7];  [6]; ORCiD logo [6];  [7];  [11]
  1. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States); Leiden Univ. (Netherlands). Leiden Observatory
  2. Thüringer Landessternwarte, Tautenburg (Germany)
  3. Pusan National Univ., Busan (South Korea)
  4. Ulsan National Institute of Science and Technology (UNIST), Ulsan (South Korea)
  5. Univ. of Minnesota, Minneapolis, MN (United States). Minnesota Inst. for Astrophysics
  6. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
  7. Leiden Univ. (Netherlands). Leiden Observatory
  8. Univ. Hamburg (Germany). Hamburger Sternwarte
  9. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  10. Univ. of California, Davis, CA (United States)
  11. European Southern Observatory, Garching (Germany)

Despite the progress that has been made in understanding radio relics, there are still open questions regarding the underlying particle acceleration mechanisms. In this paper, we present deep 1–4 GHz Very Large Array (VLA) observations of CIZA J2242.8+5301 (z = 0.1921), a double radio relic cluster characterized by small projection on the plane of the sky. Our VLA observations reveal, for the first time, the complex morphology of the diffuse sources and the filamentary structure of the northern relic. Additionally, we discover new, faint, diffuse radio emission extending north of the main northern relic. Our Mach number estimates for the northern and southern relics, based on the radio spectral index map obtained using the VLA observations and existing LOw Frequency ARray (LOFAR) and Giant Metrewave Radio Telescope data, are consistent with previous radio and X-ray studies ( and ). However, color–color diagrams and models suggest a flatter injection spectral index than the one obtained from the spectral index map, indicating that projection effects might be not entirely negligible. The southern relic consists of five "arms." Embedded in it, we find a tailed radio galaxy that seems to be connected to the relic. A spectral index flattening, where the radio tail connects to the relic, is also measured. We propose that the southern relic may trace AGN fossil electrons that are reaccelerated by a shock, with an estimated strength of . High-resolution mapping of other tailed radio galaxies also supports a scenario where AGN fossil electrons are revived by the merger event and could be related to the formation of some diffuse cluster radio emission.

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); National Research Foundation of Korea (NRF); National Aeronautics and Space Administration (NASA)
Grant/Contract Number:
AC52-07NA27344; 016R1A5A1013277; NAS8-03060; 2017R1A2A1A05071429; 2017R1D1A1A09000567
OSTI ID:
1862752
Report Number(s):
LLNL-JRNL-831918; 1049231; TRN: US2305549
Journal Information:
The Astrophysical Journal (Online), Vol. 865, Issue 1; ISSN 1538-4357
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (9)

Shocked Narrow-Angle Tail Radio Galaxies: Simulations and Emissions text January 2019
LOFAR discovery of a radio halo in the high-redshift galaxy cluster PSZ2 G099.86+58.45 text January 2019
Polarization of radio relics in galaxy clusters journal November 2019
Shocked Narrow-angle Tail Radio Galaxies: Simulations and Emissions journal December 2019
Multiwavelength Analysis of the Merging Galaxy Cluster A115 journal April 2019
Diffuse Radio Emission from Galaxy Clusters journal February 2019
LOFAR Discovery of a Radio Halo in the High-redshift Galaxy Cluster PSZ2 G099.86+58.45 journal August 2019
Close-up view of an ongoing merger between the NGC 4839 group and the Coma cluster – a post-merger scenario journal March 2019
Evidence for a Merger-induced Shock Wave in ZwCl 0008.8+5215 with Chandra and Suzaku journal March 2019

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