The Possibility of Investigating Ultra-High-Energy Cosmic-Ray Sources Using Data on the Extragalactic Diffuse Gamma-Ray Emission

Abstract

We provide our estimates of the intensity of the gamma-ray emission with an energy near 0.1 TeV generated in inrergalactic space in the interactions of cosmic rays with background emissions. We assume that the cosmic ray sources are point-like and these are active galactic nuclei. The following pjssible types of sources are considered: remote and powerful ones, at redshifts up to z=1.1, with a monoenergetic particle spectrum, E=10^21 eV; the same objects, but with a power-law particle spectrum; and nearby sources with redshifts 0<z<=0.0092, i.e. at distances no larger than 50 Mpc also with a power-law particle spectrum. The contribution of cosmic rays to to the extragalactic diffuse gamma-ray background at an energy of 0.1 TeV has been found to depend on the type of sources or, more specifically, the contribution ranges from f<<10^(-4) to f of about 0.1. depending on the source model. We conclude that the data on the extragalactic background gamma-ray emission can be used to determine the characteristics of cosmic-ray sources, i.e. their distances and the pattern of the particle energy spectrum. Keywords: cosmic rays, diffuse gamma-ray emission, active galactic nuclei. To be published in: Astronomy Letters, 2017, vol. 43, No.8, pp. 529-535.

arXiv comment11 pages, 3 figures

References in corpus (9)

• The spectrum of isotropic diffuse gamma-ray emission between 100 MeV and 820 GeV
• Origin and Propagation of Extremely High Energy Cosmic Rays
• The Extragalactic Background Light and the Gamma-ray Opacity of the Universe
• A new estimate of the extragalactic radio background and implications for ultra-high-energy gamma-ray propagation
• Evidence for a connection between the gamma-ray and the highest energy cosmic-ray emissions by BL Lacertae objects
• A Constraint on Electromagnetic Acceleration of Highest Energy Cosmic Rays
• On ultra high energy cosmic rays and their resultant gamma rays
• The Maximum Energy and Spectra of Cosmic Rays Accelerated in Active Galactic Nuclei
• A new class of inhomogeneous cosmological models with Yang-Mills fields

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• Ultra-high energy cosmic rays from supermassive black holes: particle flux on the Earth and extragalactic diffuse emission
• Study of cosmic ray sources using data on extragalactic diffuse gamma-ray emission