Contribution of Cosmic Rays from Sources with a Monoenergetic Proton Spectrum to the Extragalactic Diffuse Gamma-Ray Emission

Uryson, A. V.

doi:10.1134/s106377371807006x

Cited by 5 publications

(5 citation statements)

References 22 publications

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“…So such spectra are formed with a lower efficiency than it is assumed in model I, or they are not realized all. This is discussed in detail in Uryson (2018). Accounting for (4) in model II, the values of R in (2) and (3) are reduced.…”

Section: Resultsmentioning

confidence: 99%

“…Details of a comparison between model results and fermi-LAT data are presented in Uryson (2018;2019).…”

Section: Discussionmentioning

confidence: 99%

“…Gamma-ray telescopes with improved parameters are required for further studies of cascade emission, which is discussed in detail in Uryson (2018). The parameters of current and planned gamma-telescopes are listed and compared in (Dzhatdoev and Podlesnyi, 2019).…”

Section: Discussionmentioning

confidence: 99%

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Extragalactic Diffuse Cascade Emission as a Probe of Processes in Active Galactic Nuclei

Uryson

2024

Space Science International

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In this study, we discuss possible imprint of source characteristics on extragalactic diffuse cascade emission that is initiated by ultra-high energy cosmic rays propagating through the universe. The common opinion is that cosmic ray sources are active galactic nuclei. Based on cascade emission analyses we demonstrate that possibly a new subclass of cosmic ray sources exists, a particle flux from which on the Earth is small, however producing noticeable gamma-ray and neutrino emissions in the universe. We also estimate a fraction of active galactic nuclei with super-strong magnetic fields in their centers among those with common characteristics.

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Section: Resultsmentioning

confidence: 99%

“…Details of a comparison between model results and fermi-LAT data are presented in Uryson (2018;2019).…”

Section: Discussionmentioning

confidence: 99%

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Extragalactic Diffuse Cascade Emission as a Probe of Processes in Active Galactic Nuclei

Uryson

2024

Space Science International

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“…Source evolution apparently affect the CR spectrum near the Earth (see, e.g. [8,15]). SMBH evolution is associated with the evolution of their states (see, e.g., [16]).…”

Section: The Modelmentioning

confidence: 99%

Ultra-high energy cosmic rays from supermassive black holes: particle flux on the Earth and extragalactic diffuse emission

Uryson

2019

J. Phys.: Conf. Ser.

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Cosmic rays accelerated to ultra-high energies (E >4•10 19 eV) in electric fields in accretion discs around supermassive black holes are discussed. Particle injection spectra are assumed to be harder than those formed in acceleration at shock fronts. It turned out that cosmic rays with injection spectra supposed contribute a little in the particle flux detected with groundbased arrays. But in the extragalactic space particles generate a noticeable flux of the diffuse gamma-ray emission compared with the data obtained with Fermi LAT instrument (onboard the Fermi space observatory). The intensity of neutrinos generated by cosmic rays propagating in the extragalactic space is also derived. The model intensity of cascade neutrinos is much lower than that of astrophysics neutrino. It is concluded that possibly supermassive black holes are cosmic ray sources which contribute slightly to the particle flux detected on the Earth, but these sources should be taken into account analyzing components of extragalactic diffuse gamma-ray emission.

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“…CR injection spectra depend on processes in which particles are accelerated, and here we discuss models with various particle spectra. We analyze two CR source models previously presented in [8,9], which are denoted below by I and II. These models are based on the ideas and results of [10,11].…”

Section: Introductionmentioning

confidence: 99%

Studying Cosmic Ray Sources Using Intergalactic Electromagnetic Cascades

Uryson¹

2021

Universe

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In this paper, intergalactic electromagnetic cascades are used as a probe of cosmic ray sources. This is achieved as follows. In extragalactic space, cosmic rays initiate electromagnetic cascades, in which gamma-ray and neutrino emission arises. We used the joint analysis of cosmic ray data, along with extragalactic gamma-ray and neutrino emissions, to study particle acceleration in the vicinity of supermassive black holes. Particle injection spectra depend on processes of particle acceleration, and here we discuss models with various injection spectra. The computations of the propagation of cosmic rays in space were performed using the publicly available TransportCR code. It was found that a new subclass of sources might exist that does not contribute to the particle flux on Earth, instead to gamma-ray and neutrino emissions arising in electromagnetic cascades. In addition, the upper limit of the relative number of ‘exotic’ supermassive black holes surrounded by a superstrong magnetic field is derived.

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Contribution of Cosmic Rays from Sources with a Monoenergetic Proton Spectrum to the Extragalactic Diffuse Gamma-Ray Emission

Cited by 5 publications

References 22 publications

Extragalactic Diffuse Cascade Emission as a Probe of Processes in Active Galactic Nuclei

Extragalactic Diffuse Cascade Emission as a Probe of Processes in Active Galactic Nuclei

Ultra-high energy cosmic rays from supermassive black holes: particle flux on the Earth and extragalactic diffuse emission

Studying Cosmic Ray Sources Using Intergalactic Electromagnetic Cascades

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