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  • Nature_Astronomy_1

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The case for electron re-acceleration at galaxy cluster shocks

Research output: Contribution to Journal/MagazineJournal articlepeer-review

  • Reinout van Weeren
  • Felipe Santos
  • William Dawson
  • Nathan Golovich
  • Marcus Brüggen
  • David Wittman
  • M. James Jee
  • David Sobral
  • Andra Stroe
Article number0005
<mark>Journal publication date</mark>4/01/2017
<mark>Journal</mark>Nature Astronomy
Issue number1
Number of pages6
Publication StatusPublished
<mark>Original language</mark>English


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-size 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.

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© 2017 Macmillan Publishers Limited. All Rights Reserved.