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Galaxies 2016, 4(4), 60;

On the Non-Thermal Energy Content of Cosmic Structures

Hamburger Sternwarte, Gojenbergsweg 112, 21029 Hamburg, Germany
ETHZ-CSCS, Via Trevano 131, CH-6900 Lugano, Switzerland
Author to whom correspondence should be addressed.
Academic Editors: Stefano Ettori and Dominique Eckert
Received: 29 August 2016 / Revised: 25 October 2016 / Accepted: 26 October 2016 / Published: 2 November 2016
(This article belongs to the Special Issue Exploring the Outskirts of Galaxy Clusters)
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(1) Background: the budget of non-thermal energy in galaxy clusters is not well constrained, owing to the observational and theoretical difficulties in studying these diluted plasmas on large scales; (2) Method: we use recent cosmological simulations with complex physics in order to connect the emergence of non-thermal energy to the underlying evolution of gas and dark matter; (3) Results: the impact of non-thermal energy (e.g., cosmic rays, magnetic fields and turbulent motions) is found to increase in the outer region of galaxy clusters. Within numerical and theoretical uncertainties, turbulent motions dominate the budget of non-thermal energy in most of the cosmic volume; (4) Conclusion: assessing the distribution non-thermal energy in galaxy clusters is crucial to perform high-precision cosmology in the future. Constraining the level of non-thermal energy in cluster outskirts will improve our understanding of the acceleration of relativistic particles and of the origin of extragalactic magnetic fields. View Full-Text
Keywords: galaxy clusters; cosmic rays; magnetic fields; turbulence galaxy clusters; cosmic rays; magnetic fields; turbulence

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Vazza, F.; Wittor, D.; Brüggen, M.; Gheller, C. On the Non-Thermal Energy Content of Cosmic Structures. Galaxies 2016, 4, 60.

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