Journal
ASTROPHYSICAL JOURNAL
Volume 852, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/aa9f13
Keywords
acceleration of particles; galaxies: clusters: individual (1RXS J0603.3+4214); galaxies: clusters: intracluster medium; large-scale structure of universe; magnetic fields; radiation mechanisms: non-thermal
Categories
Funding
- Deutsche Forschungsgemeinschaft
- Harvard-Smithsonian Center for Astrophysics
- U.S. National Science Foundation [1211595, 1714205]
- Chandra grant [GO3-14131X]
- U.S. Department of Energy by Lawrence Livermore National Laboratory [DE-AC52-07NA27344]
- National Research Foundation of Korea [2017R1A2B2004644, 2017R1A4A1015178]
- [FOR 1254]
- STFC [ST/R000794/1, ST/R00109X/1] Funding Source: UKRI
- National Research Foundation of Korea [2017R1A4A1015178, 2017R1A2B2004644] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1714205, 1211595] Funding Source: National Science Foundation
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We report L-band VLA observations of 1RXS J0603.3+4214, a cluster that hosts a bright radio relic, known as the Toothbrush, and an elongated giant radio halo. These new observations allow us to study the surface brightness distribution down to 1 arcsec resolution with very high sensitivity. Our images provide an unprecedented detailed view of the Toothbrush, revealing enigmatic filamentary structures. To study the spectral index distribution, we complement our analysis with published LOFAR and GMRT observations. The bright brush of the Toothbrush shows a prominent narrow ridge to its north with a sharp outer edge. The spectral index at the ridge is in the range -0.70 <= alpha <= -0.80. We suggest that the ridge is caused by projection along the line of sight. With a simple toy model for the smallest region of the ridge, we conclude that the magnetic field is below 5 mu G and varies significantly across the shock front. Our model indicates that the actual Mach number is higher than that obtained from the injection index and agrees well with the one derived from the overall spectrum, namely M = 3.78(-0.2)(+0.3). The radio halo shows an average spectral index of alpha = -1.16 +/- 0.05 and a slight gradient from north to south. The southernmost part of the halo is steeper and possibly related to a shock front. Excluding the southernmost part, the halo morphology agrees very well with the X-ray morphology. A power-law correlation is found between the radio and X-ray surface brightness.
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