Cosmic ray contribution in extragalactic background gamma-ray emission at an energy of 0.1 TeV

We estimate the intensity of gamma-quanta at the energy 0.1 TeV that is generated in extragalactic space in interactions of ultra-high energy cosmic rays with the cosmic background emission. Energy of 0.1 TeV is chosen because the Universe is mostly transparent for these quanta. In the paper three types of cosmic ray sources are analyzed: objects with red shifts up to z = 1.1 having monoenergetic particle spectra, E = 10(21) eV; the same objects with exponential particle spectra; objects with red shifts 0 < z <= 0.0092 i.e. located at distances less than approximate to 50 Mpc, also with exponential particle spectra. It is found that the cosmic ray contribution in extragalactic background emission at 0.1 TeV ranges from f << 10(-4) to f approximate to 0.1 depending on the source characteristics. Thus the cosmic ray contribution in extragalactic background emission can be used for studying cosmic ray sources.