CONSTRAINTS ON THE VERY HIGH ENERGY EMISSIVITY OF THE UNIVERSE FROM THE DIFFUSE GeV GAMMA-RAY BACKGROUND

Abstract

Very high energy (VHE, E ? 100 GeV) radiation emitted at cosmological distances will pair produce on low-energy diffuse extragalactic background radiation before ever reaching us. This prevents us from directly seeing most of the VHE emission in the universe. However, a VHE g-ray that pair produces initiates an electromagnetic pair cascade. At low energies… (More)

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