Evidence for a Local "Fog" of Sub-Ankle UHECR
Evidence for a Local "Fog" of Sub-Ankle UHECR
During their propagation through intergalactic space, ultrahigh energy cosmic rays (UHECRs) interact with the background radiation fields. These interactions give rise to energetic electron/positron pairs and photons which in turn feed electromagnetic cascades, resulting in a diffuse gamma-ray background radiation. The gamma-ray flux level generated in this way highly depends …