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

Shigeo S. Kimura, Kenji Toma

Research output: Contribution to journalArticlepeer-review


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 languageEnglish
JournalUnknown Journal
Publication statusPublished - 2020 Mar 29


  • 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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