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

被引：22
作者：
Kimura, Shigeo S. [1 ,2 ]
Toma, Kenji [1 ,2 ]
机构：
[1] Tohoku Univ, Frontier Res Inst Interdisciplinary Sci, Sendai, Miyagi 9808578, Japan
[2] Tohoku Univ, Grad Sch Sci, Astron Inst, Sendai, Miyagi 9808578, Japan
来源：
ASTROPHYSICAL JOURNAL | 2020年 / 905卷 / 02期
关键词：
Radio active galactic nuclei; Low-luminosity active galactic nuclei; Gamma-rays; Accretion; Non-thermal radiation sources; Cosmic background radiation; GAMMA-RAY EMISSION; ADVECTION-DOMINATED ACCRETION; BLACK-HOLES; MAGNETOHYDRODYNAMIC SIMULATIONS; PARTICLE-ACCELERATION; LUMINOSITY; JET; MOMENTUM; FLOWS; M87;
D O I：
10.3847/1538-4357/abc343
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We propose a novel interpretation that gamma rays from nearby 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 nonthermal protons. They emit gamma rays via hadronic processes, which can account for the observed gamma rays for M87 and NGC 315. Nonthermal electrons are also accelerated with protons and produce MeV gamma rays, which is useful to test our model by proposed MeV satellites. The hadronic emission from the MADs may significantly contribute to the GeV gamma-ray background and produce the multi-PeV neutrino background detectable by IceCube-Gen2. In addition, gamma rays from MADs provide electron-positron pairs through two-photon pair production at the BH magnetosphere. These pairs can screen the vacuum gap, which affects high-energy emission and jet-launching mechanisms in radio galaxies.
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页数：10
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