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Abstract
Nearby sources of cosmic rays up to a ZeV(=10{sup 21} eV) could be observed with a multimessenger approach including secondary {gamma}-rays and neutrinos. If cosmic rays above {approx}10{sup 18} eV are produced in magnetized environments such as galaxy clusters, the flux of secondary {gamma}-rays can be enhanced by a factor {approx}10 at Gev energies and by a factor of a few at TeV energies, compared to unmagnetized sources. Particularly enhanced are synchrotron and cascade photons from e{sup +}e{sup -} pairs produced by protons from sources with relatively steep injection spectra {proportional_to}E{sup -2.6}. Such sources should be visible at the same time in ultrahigh energy cosmic ray experiments and {gamma}-ray telescopes.
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