Hard X-ray emission from accretion shocks around galaxy clusters

Details Hard X-ray emission from accretion shocks around galaxy clusters Hard X-ray emission from accretion shocks around galaxy clusters

2009-05-12

arxiv.org/abs/0905.1950v2

JCAP 1002:025,2010

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

7 pages, 3 figures, somewhat revised, published in JCAP

Scientific paper

10.1088/1475-7516/2010/02/025

We show that the hard X-ray (HXR) emission observed from several galaxy clusters is naturally explained by a simple model, in which the nonthermal emission is produced by inverse Compton scattering of cosmic microwave background photons by electrons accelerated in cluster accretion shocks: The dependence of HXR surface brightness on cluster temperature is consistent with that predicted by the model, and the observed HXR luminosity is consistent with the fraction of shock thermal energy deposited in relativistic electrons being \lesssim 0.1. Alternative models, where the HXR emission is predicted to be correlated with the cluster thermal emission, are disfavored by the data. The implications of our predictions to future HXR observations (e.g. by NuStar, Simbol-X) and to (space/ground based) gamma-ray observations (e.g. by Fermi, HESS, MAGIC, VERITAS) are discussed.

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