Abstract
We discuss ultra-high energy cosmic rays from minor sources and their possible contribution to the extragalactic diffuse gamma-ray emission. As an illustration of minor sources we consider the possible specific type of active galactic nuclei in which supermassive black hole is surrounded by a super strong magnetic field of 1010-1011 Gs. In this model we have calculated cosmic ray energy spectra at the Earth and intensity of cascade quanta produced by cosmic rays in extragalactic space. Proceeding from numerical results and the data by Pierre Auger Observatory and Telescope Array it is shown that these active galactic nuclei make a negligible contribution to the cosmic ray flux at the Earth. However cosmic rays from these active galactic nuclei produce significant gamma-ray flux as compared to extragalactic diffuse gamma-ray emission measured by Fermi LAT. We conclude that ultra-high energy cosmic rays from minor sources contribute noticeably to extragalactic diffuse gamma-ray emission.
Highlights
Sources of ultra-high energy (UHE) cosmic rays (CRs) seems to be extragalactic
UHECRs are presumably deflected in magnetic fields
Computing was performed with the code TransportCR [14]
Summary
Sources of ultra-high energy (UHE) cosmic rays (CRs) seems to be extragalactic. They are active galactic nuclei (AGN) but they are not still revealed. Source identification by particle arrival directions was not successful. A number of reasons makes identification difficult. Identification is carried out assuming that in extragalactic space particles propagate almost rectilinearly. UHECRs are presumably deflected in magnetic fields. Error-boxes of ~10 around arrival directions result in a large number of astrophysical objects in area near the particle arrival and this impedes source identification
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