Abstract
Here, we point out that an observation of ultrahigh energy cosmic ray (UHECR) photons, âGZK photonsâ, could provide an upper limit on the level of the extragalactic radio background, depending on the level of UHECR proton primaries (to be determined after a few years of data taking by the Pierre Auger Observatory upgrade AugerPrime). We also update our 2005 prediction of the range of GZK photon fluxes expected from proton primaries.
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