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Galaxies 2016, 4(4), 73; doi:10.3390/galaxies4040073

Galaxy Cluster Outskirts from the Thermal SZ and Non-Thermal Synchrotron Link

1
Argelander Institut für Astronomie, Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany
2
Hamburger Sternwarte, Gojenbergsweg 112, 21029 Hamburg, Germany
3
Department of Astronomy, University of Geneva, Chemin d’Ecogia 16, 1290 Versoix, Switzerland
*
Author to whom correspondence should be addressed.
Academic Editor: Stefano Ettori
Received: 11 October 2016 / Revised: 21 November 2016 / Accepted: 23 November 2016 / Published: 29 November 2016
(This article belongs to the Special Issue Exploring the Outskirts of Galaxy Clusters)
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Abstract

Galaxy cluster merger shocks are the main agent for the thermalization of the intracluster medium and the energization of cosmic ray particles in it. Shock propagation changes the state of the tenuous intracluster plasma, and the corresponding signal variations are measurable with the current generation of X-ray and Sunyaev–Zel’dovich (SZ) effect instruments. Additionally, non-thermal electrons (re-)energized by the shocks sometimes give rise to extended and luminous synchrotron sources known as radio relics, which are prominent indicators of shocks propagating roughly in the plane of the sky. In this short review, we discuss how the joint modeling of the non-thermal and thermal signal variations across radio relic shock fronts is helping to advance our knowledge of the gas thermodynamical properties and magnetic field strengths in the cluster outskirts. We describe the first use of the SZ effect to measure the Mach numbers of relic shocks, for both the nearest (Coma) and the farthest (El Gordo) clusters with known radio relics. View Full-Text
Keywords: galaxy clusters: intracluster medium; shock waves; radiation mechanisms: thermal; radiation mechanisms: non-thermal galaxy clusters: intracluster medium; shock waves; radiation mechanisms: thermal; radiation mechanisms: non-thermal
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Basu, K.; Erler, J.; Sommer, M.; Vazza, F.; Eckert, D. Galaxy Cluster Outskirts from the Thermal SZ and Non-Thermal Synchrotron Link. Galaxies 2016, 4, 73.

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