Some Seyfert galaxies are detected in high-energy gamma rays, but the mechanism and site
of gamma-ray emission are unknown. Also, the origins of the cosmic high-energy neutrino …

Over the past decades, there has been significant progress in our understanding of
accreting supermassive black holes (SMBHs) that drive active galactic nuclei (AGNs), both …

By performing general-relativistic radiative transfer calculations, we show the radio images
of relativistic jets including highly magnetized regions inside jet funnels, based on steady …

Abstract The Event Horizon Telescope (EHT) has released analyses of reconstructed
images of horizon-scale millimeter emission near the supermassive black hole at the center …

Context. The nearby elliptical galaxy M87 contains one of only two supermassive black
holes whose emission surrounding the event horizon has been imaged by the Event …

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 …

We study magnetic field strengths along the jet in NGC 315. First, we estimated the angular
velocity of rotation in the jet magnetosphere by comparing the measured velocity profile of …

Active Galactic Nuclei (AGN) are sources of high-energy γ-rays and are considered to be
promising candidates to be sources of high-energy cosmic rays and neutrinos as well. We …

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 …

In the absence of a sufficient amount of plasma injection into the black hole (BH)
magnetosphere, the force-free state of the magnetosphere cannot be maintained, leading to …