High energy gamma-ray emission from merging clusters of galaxies

Details High energy gamma-ray emission from merging clusters of galaxies High energy gamma-ray emission from merging clusters of galaxies

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....7.2728n&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

Scientific paper

High energy γ-ray emissions attributed to merger of clusters of galaxies are investigated. We study time evolution of relativistic particles under 3-D hydrodynamic simulation for the merger. The relativistic particles are assumed to be produced by shock acceleration around the shock fronts induced by merging. As a result, we obtain light curve, energy spectrum and spatial distribution of high energy γ-ray emission from inverse-Compton, bremsstruhlung and pion decay processes via such particles. We find that the higher energy emissions of each process are suppressed in the late stage of merging due to cooling by 2.7 K cosmic background radiation, and that emission is spread over ˜ Mpc.

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