Hadronic High-energy Emission from Magnetically Arrested Disks in Radio Galaxies

Shigeo S. Kimura; Kenji Toma

Hadronic High-energy Emission from Magnetically Arrested Disks in Radio Galaxies

Shigeo S. Kimura, Kenji Toma

Advanced Interdisciplinary Research Division

Research output: Contribution to journal › Article › peer-review

Abstract

We propose a novel interpretation that gamma-rays from neaby radio galaxies are hadronic emission from magnetically arrested disks (MADs) around central black holes (BHs). The magnetic energy in MADs is higher than the thermal energy of the accreting plasma, where the magnetic reconnection or turbulence may efficiently accelerate non-thermal protons. They emit gamma-rays via hadronic processes, which can account for the observed gamma-rays for M87 and NGC 315. The gamma-rays efficiently produce electron-positron pairs through two-photon annihilation in the BH magnetosphere, which can screen the vacuum gap. The hadronic emission from the MADs significantly contributes to the GeV gamma-ray background and produces the multi-PeV neutrino background detectable by IceCube-Gen2.

Original language	English
Journal	Unknown Journal
Publication status	Published - 2020 Mar 29

Keywords

Accretion (14)
Cosmic background radiation (317)
Gamma-rays (637)
Low-luminosity active galactic nuclei (2033)
Non-thermal radiation sources (1119)
Radio active galactic nuclei (2134)

ASJC Scopus subject areas

General

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title = "Hadronic High-energy Emission from Magnetically Arrested Disks in Radio Galaxies",

abstract = "We propose a novel interpretation that gamma-rays from neaby radio galaxies are hadronic emission from magnetically arrested disks (MADs) around central black holes (BHs). The magnetic energy in MADs is higher than the thermal energy of the accreting plasma, where the magnetic reconnection or turbulence may efficiently accelerate non-thermal protons. They emit gamma-rays via hadronic processes, which can account for the observed gamma-rays for M87 and NGC 315. The gamma-rays efficiently produce electron-positron pairs through two-photon annihilation in the BH magnetosphere, which can screen the vacuum gap. The hadronic emission from the MADs significantly contributes to the GeV gamma-ray background and produces the multi-PeV neutrino background detectable by IceCube-Gen2.",

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T1 - Hadronic High-energy Emission from Magnetically Arrested Disks in Radio Galaxies

AU - Kimura, Shigeo S.

AU - Toma, Kenji

PY - 2020/3/29

Y1 - 2020/3/29

N2 - We propose a novel interpretation that gamma-rays from neaby radio galaxies are hadronic emission from magnetically arrested disks (MADs) around central black holes (BHs). The magnetic energy in MADs is higher than the thermal energy of the accreting plasma, where the magnetic reconnection or turbulence may efficiently accelerate non-thermal protons. They emit gamma-rays via hadronic processes, which can account for the observed gamma-rays for M87 and NGC 315. The gamma-rays efficiently produce electron-positron pairs through two-photon annihilation in the BH magnetosphere, which can screen the vacuum gap. The hadronic emission from the MADs significantly contributes to the GeV gamma-ray background and produces the multi-PeV neutrino background detectable by IceCube-Gen2.

AB - We propose a novel interpretation that gamma-rays from neaby radio galaxies are hadronic emission from magnetically arrested disks (MADs) around central black holes (BHs). The magnetic energy in MADs is higher than the thermal energy of the accreting plasma, where the magnetic reconnection or turbulence may efficiently accelerate non-thermal protons. They emit gamma-rays via hadronic processes, which can account for the observed gamma-rays for M87 and NGC 315. The gamma-rays efficiently produce electron-positron pairs through two-photon annihilation in the BH magnetosphere, which can screen the vacuum gap. The hadronic emission from the MADs significantly contributes to the GeV gamma-ray background and produces the multi-PeV neutrino background detectable by IceCube-Gen2.

KW - Accretion (14)

KW - Cosmic background radiation (317)

KW - Gamma-rays (637)

KW - Low-luminosity active galactic nuclei (2033)

KW - Non-thermal radiation sources (1119)

KW - Radio active galactic nuclei (2134)

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