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We have developed a numerical model for the temporal evolution of particleand photon spectra resulting from nonthermal processes at the shock frontsformed in merging clusters of galaxies. Fermi acceleration is approximated byinjecting power-law distributions of particles during a merger event, subjectto constraints on maximum particle energies. We consider synchrotron,bremsstrahlung, Compton, and Coulomb processes for the electrons, nuclear,photomeson, and Coulomb processes for the protons, and knock-on electronproduction. Broadband radio through gamma-ray light curves radiated bynonthermal protons and primary and secondary electrons are calculated bothduring and after the merger event. Using ROSAT observations to establishtypical parameters for the matter density profile of clusters of galaxies, wefind that merger shocks are weak and accelerate particles with relatively softspectra. Our results suggest that only a minor contribution to the diffuseextragalactic gamma-ray background can originate from cluster merger shocks.Comment: 4 pages, 2 figures, contribution to the 13th Annual Astrophysics  Conference in Maryland, The Emergence of Cosmic Structur

Nonthermal Particles and Radiation Produced by Cluster Merger Shocks