Contribution of Cosmic Rays from Sources with a Monoenergetic Proton Spectrum to the Extragalactic Diffuse Gamma-Ray Emission. (arXiv:1901.00376v1 [astro-ph.HE])

Contribution of Cosmic Rays from Sources with a Monoenergetic Proton Spectrum to the Extragalactic Diffuse Gamma-Ray Emission. (arXiv:1901.00376v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Uryson_A/0/1/0/all/0/1">Anna Uryson</a>

The extragalactic sources of ultra-high-energy (E > 4×10^19 eV) cosmic rays
that make a small contribution to the flux of particles recorded by
ground-based arrays are discussed. We show that cosmic rays from such sources
can produce a noticeable diffuse gamma-ray flux in intergalactic space compared
to the the data obtained with Fermi LAT (onboard the Fermi space observatory).
A possible type of active galactic nuclei (AGNs) in which cosmic-ray protons
can be accelerated to energies 1021 eV is considered as an illustration of such
sources. We conclude that ultra-high-energy cosmic rays from the AGNs being
discussed can contribute significantly to the extragalactic diffuse gamma-ray
emission. In addition, a constraint on the fraction of the AGNs under
consideration relative to the BL Lac objects and radio galaxies has been
obtained from a comparison with the Fermi LAT data.

The extragalactic sources of ultra-high-energy (E > 4×10^19 eV) cosmic rays
that make a small contribution to the flux of particles recorded by
ground-based arrays are discussed. We show that cosmic rays from such sources
can produce a noticeable diffuse gamma-ray flux in intergalactic space compared
to the the data obtained with Fermi LAT (onboard the Fermi space observatory).
A possible type of active galactic nuclei (AGNs) in which cosmic-ray protons
can be accelerated to energies 1021 eV is considered as an illustration of such
sources. We conclude that ultra-high-energy cosmic rays from the AGNs being
discussed can contribute significantly to the extragalactic diffuse gamma-ray
emission. In addition, a constraint on the fraction of the AGNs under
consideration relative to the BL Lac objects and radio galaxies has been
obtained from a comparison with the Fermi LAT data.

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