PeV Neutrinos from Intergalactic Interactions of Cosmic Rays Emitted by Active Galactic Nuclei

Kalashev, O.; Kusenko, Alexander; Essey, Warren

doi:10.1103/physrevlett.111.041103

Cited by 108 publications

(102 citation statements)

References 42 publications

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“…A famous example is cosmogenic neutrino production in intergalactic space [43], which is caused by CRs escaping from CR accelerators. However, the typical energy of such off-source neutrinos is ∼ 1 − 10 EeV (unless a cutoff is introduced in the CR spectrum [44]) and the spectrum is too hard to explain sub-PeV neutrino events. Thus, this possibility is unlikely [45,6,46].…”

Section: Photohadronic Production In Cosmic-ray Acceleratorsmentioning

confidence: 99%

On the origin of high-energy cosmic neutrinos

Murase¹

2015

AIP Conference Proceedings

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Abstract. Recently, the IceCube collaboration made a big announcement of the first discovery of high-energy cosmic neutrinos. Their origin is a new interesting mystery in astroparticle physics, but the present data may give us hints of connection to cosmic-ray and/or gamma-ray sources. We will look over possible scenarios for the cosmic neutrino signal, and emphasize the importance of multimessenger approaches in order to identify the PeV neutrino sources and get crucial clues to the cosmic-ray origin. We also discuss some possibilities to study neutrino properties and probe new physics.

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Section: Photohadronic Production In Cosmic-ray Acceleratorsmentioning

confidence: 99%

On the origin of high-energy cosmic neutrinos

Murase¹

2015

AIP Conference Proceedings

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“…Many papers discuss the neutrino emission from one specific source class by adopting a modeldependent approach, for active galactic nuclei (AGNs) [9][10][11][12][13][14][15][16][17][18], star-forming galaxies [19][20][21][22][23][24][25][26][27][28], gamma-ray bursts [29][30][31][32][33][34][35][36], galaxy clusters [37][38][39][40], and dark matter decays [41][42][43][44][45].…”

Section: Tomographic Constraints On High-energy Neutrinos Of Hadronucmentioning

confidence: 99%

Tomographic Constraints on High-Energy Neutrinos of Hadronuclear Origin

2015

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Mounting evidence suggests that the TeV-PeV neutrino flux detected by the IceCube telescope has mainly an extragalactic origin. If such neutrinos are primarily produced by a single class of astrophysical sources via hadronuclear (pp) interactions, a similar flux of gamma-ray photons is expected. For the first time, we employ tomographic constraints to pinpoint the origin of the IceCube neutrino events by analyzing recent measurements of the cross correlation between the distribution of GeV gamma rays, detected by the Fermi satellite, and several galaxy catalogs in different redshift ranges. We find that the corresponding bounds on the neutrino luminosity density are up to 1 order of magnitude tighter than those obtained by using only the spectrum of the gamma-ray background, especially for sources with mild redshift evolution. In particular, our method excludes any hadronuclear source with a spectrum softer than E −2.1 as a main component of the neutrino background, if its evolution is slower than ð1 þ zÞ 3 . Starburst galaxies, if able to accelerate and confine cosmic rays efficiently, satisfy both spectral and tomographic constraints. Introduction.-The discovery of the PeV neutrinos by IceCube [1,2] has launched the era of high-energy neutrino astronomy. The current data set is compatible with a flux in excess with respect to the atmospheric background, with an isotropic allocation of events on the celestial sphere and flavor equipartition [1][2][3][4][5][6]. Because of the current low statistics, the origin of the high-energy IceCube events is not yet known, but an extragalactic and mostly diffuse origin appears to be favored [7,8].High-energy neutrino production from cosmic accelerators has been the subject of a cascade of theoretical studies, especially after the IceCube results were announced [7,8]. Many papers discuss the neutrino emission from one specific source class by adopting a modeldependent approach, for active galactic nuclei (AGNs) [9][10][11][12][13][14][15][16][17][18], star-forming galaxies [19][20][21][22][23][24][25][26][27][28], gamma-ray bursts [29][30][31][32][33][34][35][36], galaxy clusters [37][38][39][40], and dark matter decays [41][42][43][44][45].Alternatively, a more generic approach focuses on the phenomenological aspects of the potential sources. For example, assuming photomeson production (pγ) of neutrinos, Ref.[46] obtained constraints on the source size and magnetic field strength needed to match the IceCube flux. Reference [47] hypothesized that the TeV-PeV neutrinos were generated via hadronuclear interactions (pp) and concluded that the cosmic ray spectrum of the dominant neutrino sources should be harder than E −2.2 . This is because the associated gamma-ray spectrum will extend down to GeV energies, where the flux of the isotropic gamma-ray background (IGRB) measured with the Fermi Large Area Telescope (LAT) [48] cannot be overshot. The connection with sources of ultrahigh-energy cosmic rays has also been considered [49][50][51].

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“…The relation to cosmogenic neutrino fluxes due to the propagation of UHE CRs in the cosmic background radiation is unlikely [37]. Possible exceptions are cosmogenic neutrinos from blazars with a low maximal CR energy [38] to avoid strong bounds from the diffuse extragalactic γ-ray background.…”

Section: Uhe Crs and The Icecube Excessmentioning

confidence: 99%

Multi-messenger tests of the IceCube excess

Ahlers¹

2014

AIP Conference Proceedings

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Abstract. The IceCube Collaboration has recently found evidence for an excess of high energy neutrinos above atmospheric backgrounds. The origin of this "IceCube excess" is unknown, but multi-messenger relations with cosmic rays (CRs) and γ-rays can help to pinpoint possible candidate sources. The primary CRs associated with the signal are expected to reach energies of about 40 PeV per nucleon which can be satisfied by (extreme) Galactic or extragalactic sources. I discuss possible relations of the IceCube excess with the sources of ultra-high energy CRs and implications of γ-ray observations for various Galactic or extragalactic candidate sources. The contribution of Galactic sources can be tested via primary TeV-PeV γ-rays from the decay of neutral pions produced by the same CRs responsible for the neutrino emission. Hadronuclear interactions of CRs in extragalactic sources can be constrained by the GeV-TeV diffuse extragalactic γ-ray background.

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PeV Neutrinos from Intergalactic Interactions of Cosmic Rays Emitted by Active Galactic Nuclei

Cited by 108 publications

References 42 publications

On the origin of high-energy cosmic neutrinos

On the origin of high-energy cosmic neutrinos

Tomographic Constraints on High-Energy Neutrinos of Hadronuclear Origin

Multi-messenger tests of the IceCube excess

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