Hidden Cores of Active Galactic Nuclei as the Origin of Medium-Energy Neutrinos: Critical Tests with the MeV Gamma-Ray Connection

Murase, Kohta; Kimura, Shigeo S.; Mészáros, P.

doi:10.1103/physrevlett.125.011101

Cited by 136 publications

(226 citation statements)

References 111 publications

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“…Since the diffuse Galactic emission component, based on models of galactic particle propagation and interactions [33], is subdominant [34,35], of particular interest is the energy range ∼10-100 TeV. In this energy region, hardly accessible to muon neutrinos, several source models, including AGN cores [36,37], predict a sizable energy dependent flux. In this Letter we present the first results on the astrophysical flux of electron and tau neutrinos determined with six years of IceCube data.…”

mentioning

confidence: 99%

Characteristics of the Diffuse Astrophysical Electron and Tau Neutrino Flux with Six Years of IceCube High Energy Cascade Data

Aartsen¹,

Ackermann²,

Adams³

et al. 2020

Phys. Rev. Lett.

214

206

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mentioning

confidence: 99%

Characteristics of the Diffuse Astrophysical Electron and Tau Neutrino Flux with Six Years of IceCube High Energy Cascade Data

Aartsen¹,

Ackermann²,

Adams³

et al. 2020

Phys. Rev. Lett.

214

206

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“…E F E [GeV cm -2 Figure 5: Left: Diffuse neutrino and gamma-ray fluxes expected in the RQ AGN model, in which particles are accelerated in the coronal region of Seyfert galaxies [25]. High-energy coronal emissions are responsible for 10-100 TeV neutrinos and MeV gamma rays, as well as the X-ray background in this model.…”

Section: Pos(icrc2019)965mentioning

confidence: 87%

“…Only neutrinos can directly escape from the system. Right: Schematic picture of AGN core models [25]. Cosmic rays can be accelerated in the coronal region above an accretion disk around a supermassive black hole.…”

Section: Pos(icrc2019)965mentioning

confidence: 99%

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Multi-Messenger Connections among High-Energy Cosmic Particles

Murase¹

2019

Proceedings of 36th International Cosmic Ray Conference — PoS(ICRC2019)

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The origin of high-energy cosmic neutrinos is one of the biggest mysteries in astroparticle physics. The fact that diffuse intensities of high-energy neutrinos, ultrahigh-energy cosmic rays, and GeV-TeV gamma rays are all comparable suggests that these messengers are physically connected. The IceCube data above 100 TeV energies can be naturally explained by cosmic-ray reservoir models. In particular, starburst galaxies and galaxy clusters/groups serve as natural storage rooms of cosmic rays, and it has been theoretically predicted that these sources are promising sites of high-energy neutrinos and gamma rays that are produced via inelastic pp interactions. Indeed, the predictions made before the discovery of IceCube neutrinos are consistent with the current highenergy neutrino data measured in IceCube, and that they could give a grand-unified view of sub-PeV neutrinos, sub-TeV gamma rays, and ultrahigh-energy cosmic rays. These unified models have strong prediction powers, which can be tested by next-generation neutrino detectors such as IceCube-Gen2 as well as gamma-ray telescopes such as CTA. The recent observations have also shown that the 10-100 TeV diffuse neutrino flux is higher than that at PeV energies, which suggests that they come from a different class of neutrino sources. The detailed comparison with the diffuse isotropic gamma-ray background measured by Fermi has revealed that these mediumenergy neutrinos are likely to come from hidden cosmic-ray accelerators, from which neutrinos can escape while GeV-TeV gamma rays are attenuated. The candidate source classes are choked gamma-ray burst jets and active galactic nuclei cores. In particular, the model of radio-quiet active galactic nuclei predicts a unique connection between 10-100 TeV neutrinos and MeV gamma rays, which can be robustly tested with future MeV gamma-ray missions such as AMEGO.

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“…This solution, however, may present challenges in the model-building sense: on one hand the source must be dense enough to suppress γ-ray emission, on the other hand, the denser a source becomes, the harder it gets to accelerate charged particles (which are responsible for producing the neutrinos and γ-rays in the first place). Much work has been done in modelling such γ-ray-opaque source candidates, which include choked-jet GRBs [150,151] and AGN cores [152,153,154,155,156]. MeV γ-ray and x-ray counterpart searches have also been suggested [100], since only lower energy photons would be capable of escaping their sources.…”

Section: Interpretations and Discussionmentioning

confidence: 99%

Cascaded Gamma-Ray Counterpart of the Icecube Neutrinos

GALVAO¹

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Hidden Cores of Active Galactic Nuclei as the Origin of Medium-Energy Neutrinos: Critical Tests with the MeV Gamma-Ray Connection

Cited by 136 publications

References 111 publications

Characteristics of the Diffuse Astrophysical Electron and Tau Neutrino Flux with Six Years of IceCube High Energy Cascade Data

Characteristics of the Diffuse Astrophysical Electron and Tau Neutrino Flux with Six Years of IceCube High Energy Cascade Data

Multi-Messenger Connections among High-Energy Cosmic Particles

Cascaded Gamma-Ray Counterpart of the Icecube Neutrinos

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