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류동수

Ryu, Dongsu
Astrophysics Lab.
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The case for electron re-acceleration at galaxy cluster shocks

Author(s)
van Weeren, Reinout J.Andrade-Santos, FelipeDawson, William A.Golovich, NathanLal, Dharam V.Kang, HyesungRyu, DongsuBrueggen, MarcusOgrean, Georgiana A.Forman, William R.Jones, ChristinePlacco, Vinicius M.Santucci, Rafael M.Wittman, DavidJee, M. JamesKraft, Ralph P.Sobral, DavidStroe, AndraFogarty, Kevin
Issued Date
2017-01
DOI
10.1038/s41550-016-0005
URI
https://scholarworks.unist.ac.kr/handle/201301/22579
Fulltext
https://www.nature.com/articles/s41550-016-0005
Citation
NATURE ASTRONOMY, v.1, pp.0005
Abstract
On the largest scales, the Universe consists of voids and filaments making up the cosmic web. Galaxy clusters are located at the knots in this web, at the intersection of filaments. Clusters grow through accretion from these large-scale filaments and by mergers with other clusters and groups. In a growing number of galaxy clusters, elongated Mpc-sized radio sources have been found(1,2). Also known as radio relics, these regions of diffuse radio emission are thought to trace relativistic electrons in the intracluster plasma accelerated by low-Mach-number shocks generated by cluster-cluster merger events(3). A long-standing problem is how low-Mach-number shocks can accelerate electrons so efficiently to explain the observed radio relics. Here, we report the discovery of a direct connection between a radio relic and a radio galaxy in the merging galaxy cluster Abell 3411-3412 by combining radio, X-ray and optical observations. This discovery indicates that fossil relativistic electrons from active galactic nuclei are re-accelerated at cluster shocks. It also implies that radio galaxies play an important role in governing the non-thermal component of the intracluster medium in merging clusters.
Publisher
NATURE PUBLISHING GROUP
ISSN
2397-3366
Keyword
DIFFUSE RADIO-EMISSIONLARGE-SCALE STRUCTUREPARTICLE-ACCELERATIONCIZA J2242.8+5301X-RAYRELICSCHANDRAWAVESCOMPLEXFRONT

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