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 …

The spectra of BL Lac objects and Fanaroff–Riley I radio galaxies are commonly explained
by the one-zone leptonic synchrotron self-Compton (SSC) model. Spectral modeling of …

In this paper we review the extragalactic propagation of ultrahigh energy cosmic-ray
(UHECR). We present the different energy loss processes of protons and nuclei, and their …

We perform Monte Carlo simulations of transrelativistic shear acceleration dedicated to a jet-
cocoon system of active galactic nuclei. A certain fraction of galactic cosmic rays in a halo is …

ABSTRACT Fermi Gamma-ray Space Telescope measurements of spectra, variability
timescales, and maximum photon energies give lower limits to the apparent jet powers and …

We derive lower bounds on the density of sources of ultra-high energy cosmic rays from the
lack of significant clustering in the arrival directions of the highest energy events detected at …

The diffuse neutrino flux measured in IceCube is comparable with the ultrahigh-energy
cosmic-ray (UHECR) flux, which has led to the concept of a unified origin of high-energy …

Recent measurements by the Pierre Auger Observatory suggest that the composition of
ultrahigh energy cosmic rays (UHECRs) becomes dominated by heavy nuclei at high …

The detection of ultrahigh-energy (UHE) neutrino sources would contribute significantly to
solving the decades-old mystery of the origin of the highest-energy cosmic rays. We …

Active galactic nuclei (AGNs) have been one of the most widely discussed sources of
ultrahigh-energy cosmic rays (UHECRs). The recent results of the Pierre Auger observatory …