Gamma-Ray and Neutrino Signals from Accretion Disk Coronae of Active Galactic Nuclei

To explain X-ray spectra of active galactic nuclei (AGN), non-thermal activity in AGN coronae such as pair cascade models has been extensively discussed the past literature. Although and gamma-ray observations 1990s disfavored models, recent millimeter-wave nearby Seyferts establish existence weak coronal activity. Besides, IceCube collaboration reported NGC 1068, a Seyfert, hottest spot their 10-yr survey. These pieces evidence are enough to investigate perspective depth again. This article summarizes our current observational understandings describes how generate high-energy particles. We also provide ways test corona model with radio, X-ray, MeV gamma-ray, neutrino observations.