Cosmic Rays and Magnetic Fields in Large Scale Structure of the Universe

Details Cosmic Rays and Magnetic Fields in Large Scale Structure of the Universe Cosmic Rays and Magnetic Fields in Large Scale Structure of the Universe

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007ebhe.conf...28k&link_type=abstract

ENERGY BUDGET IN THE HIGH ENERGY UNIVERSE . Proceedings of the International Workshop. Held 22-24 February 2006 in Kashiwa, Japa

Astronomy and Astrophysics

Astrophysics

Scientific paper

Diffuse radio emission from galaxy clusters indicates the presence of GeV electrons and microgauss level magnetic fields in the intracluster medium (ICM). Nonthermal emission due to Inverse Compton scattering of relativistic electrons off the cosmic microwave background radiation (CMBR) has been also detected in several clusters. Considering that most acceleration mechanisms preferentially accelerate more protons than electrons, we can deduce that the energy contained in CR protons could be even more substantial. We review the possible astrophysical sources that can inject and accelerate CRs, and generate and amplify magnetic fields in the ICM. From both observational and theoretical grounds, we conclude that the energy budget of CR protons, magnetic fields, and turbulence is each order of 10 % of thermal energy, while CR electrons may contain less than 1 % of thermal energy.

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