期刊
ASTROPHYSICAL JOURNAL
卷 785, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/785/1/1
关键词
acceleration of particles; galaxies: clusters: individual (PLCKG287.0+32.9); magnetic fields; methods: observational; shock waves; radiation mechanisms: non-thermal
资金
- research group FOR [1254]
- Deutsche Forschungsgemeinschaft
- NASA [PF2-130104, NAS8-03060]
- Chandra X-ray Center
Radio relics are diffuse radio sources observed in galaxy clusters, probably produced by shock acceleration during cluster-cluster mergers. Their large size, of the order of 1 Mpc, indicates that the emitting electrons need to be (re) accelerated locally. The usually invoked diffusive shock acceleration models have been challenged by recent observations and theory. We report the discovery of complex radio emission in the Galaxy cluster PLCKG287.0+32.9, which hosts two relics, a radio halo, and several radio filamentary emission. Optical observations suggest that the cluster is elongated, likely along an intergalactic filament, and displays a significant amount of substructure. The peculiar features of this radio relic are that (1) it appears to be connected to the lobes of a radio galaxy and (2) the radio spectrum steepens on either side of the radio relic. We discuss the origins of these features in the context of particle re-acceleration.
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