Ultra-High Energy Cosmic Rays and the GeV-TeV Diffuse Gamma-Ray Flux

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

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• The nature of the Diffuse Gamma-Ray Background
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• Anisotropies in the diffuse gamma-ray background measured by the Fermi LAT
• Components of the Extragalactic Gamma Ray Background
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• Gamma-Ray and Neutrino Backgrounds as Probes of the High-Energy Universe: Hints of Cascades, General Constraints, and Implications for TeV Searches
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• Deciphering Contributions to the Extragalactic Gamma-Ray Background from 2 GeV to 2 TeV
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• Cosmogenic gamma-rays and the composition of cosmic rays
• Constraints on the origin of ultra-high-energy cosmic rays from cosmogenic neutrinos and photons
• Identifying Dark Matter Annihilation Products In The Diffuse Gamma Ray Background
• Testing gamma-ray models of blazars in the extragalactic sky
• Anisotropies in the Diffuse Gamma-Ray Background from Dark Matter with Fermi LAT: a closer look
• Parameter constraints in a near-equipartition model with multi-frequency \emph{NuSTAR}, \emph{Swift} and \emph{Fermi-LAT} data from 3C 279
• Constraining the Emissivity of Ultrahigh Energy Cosmic Rays in the Distant Universe with the Diffuse Gamma-ray Emission
• Gamma-ray luminosity function of BL Lac objects and contribution to the extragalactic gamma-ray background
• The Spectral Shape and Photon Fraction as Signatures of the GZK-Cutoff
• Galactic-Centre Gamma Rays in CMSSM Dark Matter Scenarios
• The Effect of Blazar Spectral Breaks on the Blazar Contribution to the Extragalactic Gamma-ray Background
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• Characterising the signatures of star-forming galaxies in the extra-galactic $\gamma$-ray background
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• A self-consistent interpretation of the GeV-TeV emission from a distant blazar PKS 1424+240
• Constraints on dark matter and astrophysics from tomographic $\gamma$-ray cross-correlations
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• Ultra High Energy Cosmic Ray, Neutrino, and Photon Propagation and the Multi-Messenger Approach
• Conservative upper limits on WIMP annihilation cross section from Fermi-LAT $\gamma$-rays
• KiDS-Legacy: WIMP dark matter constraints from the cross-correlation of weak lensing and Fermi-LAT gamma rays
• Extragalactic Searches for Dark Matter Annihilation