The origin of the Fermi-LAT $γ$-ray background

Di Mauro, Mattia

doi:10.48550/arxiv.1601.04323

Cited by 11 publications

(15 citation statements)

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“…The stronger upper limit on ω iso cas obtained here put the stronger upper limit on the flux of UHE extragalactic protons and cosmogenic neutrinos, in comparison with [8][9][10]. The effect of increasing the fraction of resolved sources [52] diminishes further J cas (E) and ω cas given above.…”

Section: A Upper Limit On ωCas In Analytic Calculationsmentioning

confidence: 46%

“…These catalogs are based on the new program of analysis, Pass 8, with the improved reconstruction and classification of events, and with the time of observation increased to 6 years. The analysis of the work [52] shows that the considerable fraction of high energy events above 50 GeV can be attributed to unresolved sources most of which are blazars. For EGB flux, contribution of blazars according to this work reaches 86 +16 −14 %.…”

Section: B Upper Limit On ωCas In Numerical Simulationsmentioning

confidence: 99%

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High-energy electromagnetic cascades in extragalactic space: Physics and features

2016

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Using the analytic modeling of the electromagnetic cascades compared with more precise numerical simulations we describe the physical properties of electromagnetic cascades developing in the universe on CMB and EBL background radiations. A cascade is initiated by very high energy photon or electron and the remnant photons at large distance have two-component energy spectrum, ∝ E −2 (∝ E −1.9 in numerical simulations) produced at cascade multiplication stage, and ∝ E −3/2 from Inverse Compton electron cooling at low energies. The most noticeable property of the cascade spectrum in analytic modeling is 'strong universality', which includes the standard energy spectrum and the energy density of the cascade ωcas as its only numerical parameter. Using numerical simulations of the cascade spectrum and comparing it with recent Fermi LAT spectrum we obtained the upper limit on ωcas stronger than in previous works. The new feature of the analysis is "Emax rule". We investigate the dependence of ωcas on the distribution of sources, distinguishing two cases of universality: the strong and weak ones.PACS numbers: 98.70. Sa, 95.85.Pw,95.85.Ry

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Section: A Upper Limit On ωCas In Analytic Calculationsmentioning

confidence: 46%

Section: B Upper Limit On ωCas In Numerical Simulationsmentioning

confidence: 99%

High-energy electromagnetic cascades in extragalactic space: Physics and features

2016

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“…This value includes the emission from individual unresolved gamma-ray sources. Their contribution to the IGRB at energies E>50 GeV equals to 86 (−14,+16)% [7]. Subtracting from the IGRB the unresolved source contribution of 86%, we obtain IGRB without blazars (E>50 GeV) =1.855×10 -10 (cm -2 s -1 sr -1 ).…”

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confidence: 87%

“…where I unresolved blazars is the intensity of individual unresolved gamma-ray sources that is a part of IGRB. The intensity IGRB is measured by the gamma-ray telescope Fermi LAT onboard cosmic observatory Fermi [6], I unresolved blazars is estimated theoretically [7]. In [1][2][3] the intensity Icascade γ has been calculated in models which fit the measured UHECR spectrum.…”

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confidence: 99%

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Extragalactic cosmic ray sources with very small particle flux on Earth and their study

Uryson

2019

Phys. Rev. D

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Possible existence of extragalactic ultra-high energy cosmic ray sources giving a very small particle flux on the Earth are considered. Accretion discs around supermassive black holes where particles are accelerated in electric fields are discussed as an illustration of such sources. Due to acceleration mechanism particle injection spectra are assumed to be hard. In this case particle flux on the Earth is too low for detection. But particles produce in space a noticeable flux of diffuse gamma-ray emission via electromagnetic cascades. It should be accounted for when analyzing other source models and dark matter models. Also neutrinos are produced in cascades, and at energies E >10 19 eV cascade neutrino spectra depends on injection spectra.Therefore it is proposed to study cosmic ray sources under consideration using data on gammaray and neutrino emission.

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Analysis Methods for Gamma-Ray Astronomy

Malyshev,

Mohrmann

2023

Handbook of X-Ray and Gamma-Ray Astrophysics

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The origin of the Fermi-LAT $γ$-ray background

Cited by 11 publications

References 0 publications

High-energy electromagnetic cascades in extragalactic space: Physics and features

High-energy electromagnetic cascades in extragalactic space: Physics and features

Extragalactic cosmic ray sources with very small particle flux on Earth and their study

Analysis Methods for Gamma-Ray Astronomy

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