Ponente
Descripción
In this talk, I will review recent developments in high-energy extragalactic astrophysics, particularly concerning high-energy particles, including gamma-rays and neutrinos, in supermassive black holes, blazars, gamma-ray bursts, tidal disruption events, and binary neutron star mergers. We have not found a significant correlation between the arrival directions of ultra-high-energy cosmic rays (UHECRs) and any type of astronomical objects yet. On the other hand, interestingly, the significance of neutrino signals from Seyfert galaxies is gradually increasing, and particle acceleration near black hole accretion disks is being seriously considered. It is possible that UHECRs also originate from such unexpected celestial bodies. Reviewing recent observational and theoretical studies for possible high-energy particle sources, I will discuss the particle acceleration mechanism, secondary particle production, and jet dynamics.
