Preprint Article Version 1 NOT YET PEER-REVIEWED

On the Non-Thermal Energy Content of Cosmic Structures

  1. Hamburger Sternwarte, Gojenbergsweg 112, 21029 Hamburg, Germany
  2. ETHZ-CSCS, Via Trevano 131, CH-6900 Lugano, Switzerland
Version 1 : Received: 29 August 2016 / Approved: 30 August 2016 / Online: 30 August 2016 (08:53:32 CEST)

A peer-reviewed article of this Preprint also exists.

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

Journal reference: Galaxies 2016, 4, 60
DOI: 10.3390/galaxies4040060

Abstract

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 by cosmic shocks and of the origin of extragalactic magnetic fields.

Subject Areas

Galaxy clusters; cosmic rays; magnetic fields; turbulence

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