Hidden cores of active galactic nuclei as the origin of medium-energy neutrinos: critical tests with the MeV gamma-ray connection
Mysteries about the origin of high-energy cosmic neutrinos have deepened by the recent
IceCube measurement of a large diffuse flux in the 10–100 TeV range. Based on the …
IceCube measurement of a large diffuse flux in the 10–100 TeV range. Based on the …
High-energy neutrinos from magnetized coronae of active galactic nuclei and prospects for identification of Seyfert galaxies and quasars in neutrino telescopes
Particles may be accelerated in magnetized coronae via magnetic reconnections and/or
plasma turbulence, leading to high-energy neutrinos and soft γ-rays. We evaluate the …
plasma turbulence, leading to high-energy neutrinos and soft γ-rays. We evaluate the …
Neutrino and cosmic-ray emission and cumulative background from radiatively inefficient accretion flows in low-luminosity active galactic nuclei
We study high-energy neutrino and cosmic-ray (CR) emission from the cores of low-
luminosity active galactic nuclei (LLAGN). In LLAGN, the thermalization of particles is …
luminosity active galactic nuclei (LLAGN). In LLAGN, the thermalization of particles is …
The content of astrophysical jets
GE Romero - Astronomische Nachrichten, 2021 - Wiley Online Library
Jets, collimated outflows of particles and fields, are observed in a wide variety of
astrophysical systems, including Active Galactic Nuclei of various types, micro‐quasars …
astrophysical systems, including Active Galactic Nuclei of various types, micro‐quasars …
Magnetization degree at the jet base of M87 derived from the event horizon telescope data: testing the magnetically driven jet paradigm
We explore the degree of magnetization at the jet base of M87 by using the observational
data of the event horizon telescope (EHT) at 230 GHz obtained by Doeleman et al. By …
data of the event horizon telescope (EHT) at 230 GHz obtained by Doeleman et al. By …
Acceleration and escape processes of high-energy particles in turbulence inside hot accretion flows
We investigate acceleration and propagation processes of high-energy particles inside hot
accretion flows. The magnetorotational instability (MRI) creates turbulence inside accretion …
accretion flows. The magnetorotational instability (MRI) creates turbulence inside accretion …
Magnetic Reconnection in Black Hole Magnetospheres: Lepton Loading into Jets, Superluminal Radio Blobs, and Multiwavelength Flares
SS Kimura, K Toma, H Noda… - The Astrophysical Journal …, 2022 - iopscience.iop.org
Supermassive black holes in active galactic nuclei launch relativistic jets, as indicated by
observed superluminal radio blobs. The energy source of these jets is widely discussed in …
observed superluminal radio blobs. The energy source of these jets is widely discussed in …
Soft gamma rays from low accreting supermassive black holes and connection to energetic neutrinos
The Universe is filled with a diffuse background of MeV gamma-rays and PeV neutrinos,
whose origins are unknown. Here, we propose a scenario that can account for both …
whose origins are unknown. Here, we propose a scenario that can account for both …
Hadronic High-energy Emission from Magnetically Arrested Disks in Radio Galaxies
SS Kimura, K Toma - The Astrophysical Journal, 2020 - iopscience.iop.org
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 …
emission from magnetically arrested disks (MADs) around central black holes (BHs). The …
Stochastic particle acceleration in turbulence generated by magnetorotational instability
We investigate stochastic particle acceleration in accretion flows. It is believed that
magnetorotational instability (MRI) generates turbulence inside accretion flows and that …
magnetorotational instability (MRI) generates turbulence inside accretion flows and that …