EVIDENCE FOR PARTICLE RE-ACCELERATION IN THE RADIO RELIC IN THE GALAXY CLUSTER PLCKG287.0+32.9

被引：115

作者：

Bonafede, A. ^{[1
]}

Intema, H. T. ^{[2
]}

Brueggen, M. ^{[1
]}

Girardi, M. ^{[3
,4
]}

Nonino, M. ^{[4
]}

Kantharia, N. ^{[5
]}

van Weeren, R. J. ^{[6
]}

Roettgering, H. J. A. ^{[7
]}

机构：

[1] Univ Hamburg, Hamburger Sternwarte, D-21029 Hamburg, Germany

[2] Natl Radio Astron Observ, Socorro, NM 87801 USA

[3] Univ Trieste, Sez Astron, Dipartimento Fis, I-34143 Trieste, Italy

[4] INAF Osservatorio Astron Trieste, I-34143 Trieste, Italy

[5] TIFR, Natl Ctr Radio Astrophys, Pune 411007, Maharashtra, India

[6] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[7] Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands

来源：

ASTROPHYSICAL JOURNAL | 2014年 / 785卷 / 01期

关键词：

acceleration of particles; galaxies: clusters: individual (PLCKG287.0+32.9); magnetic fields; methods: observational; shock waves; radiation mechanisms: non-thermal; X-RAY LUMINOSITY; LOW-FREQUENCY; GAMMA-RAY; DATA REDUCTION; SHOCK-WAVES; HALOS; EMISSION; ACCELERATION; SIMULATIONS; SIGNATURES;

D O I：

10.1088/0004-637X/785/1/1

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：14

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