Ultra-High Energy Cosmic Rays and the GeV-TeV Diffuse Gamma-Ray Flux
arXiv:0704.2463 · doi:10.1103/PhysRevD.79.063005
Abstract
Ultra-high energy cosmic ray protons accelerated in astrophysical objects produce secondary electromagnetic cascades during propagation in the cosmic microwave and infrared backgrounds. We show that such cascades can contribute between ~1% and ~50% of the GeV-TeV diffuse photon flux measured by the EGRET experiment. The GLAST satellite should have a good chance to discover this flux.
4 pages, 5 figures