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Isotropy constraints on powerful sources of ultrahigh-energy cosmic rays at eV
Hajime Takami, Kohta Murase, Charles D. Dermer
Anisotropy in the arrival direction distribution of ultrahigh-energy cosmic rays (UHECRs) produced by powerful sources is numerically evaluated. We show that, taking account of the…
Neutrino and Cosmic-Ray Emission and Cumulative Background from Radiatively Inefficient Accretion Flows in Low-Luminosity Active Galactic Nuclei
Shigeo S. Kimura, Kohta Murase, Kenji Toma
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 expected to…
Gamma-Ray and Hard X-Ray Emission from Pulsar-Aided Supernovae as a Probe of Particle Acceleration in Embryonic Pulsar Wind Nebulae
Kohta Murase, Kazumi Kashiyama, Kenta Kiuchi +1
It has been suggested that some classes of luminous supernovae (SNe) and gamma-ray bursts (GRBs) are driven by newborn magnetars. Fast-rotating proto-neutron stars have also been o…
Neutrino and cosmic-ray emission from multiple internal shocks in gamma-ray bursts
Mauricio Bustamante, Philipp Baerwald, Kohta Murase +1
Gamma-ray bursts are short-lived, luminous explosions at cosmological distances, thought to originate from relativistic jets launched at the deaths of massive stars. They are among…
Synchrotron pair halo and echo emission from blazars in the cosmic web: application to extreme TeV blazars
Foteini Oikonomou, Kohta Murase, Kumiko Kotera
High frequency peaked high redshift blazars, are extreme in the sense that their spectrum is particularly hard and peaks at TeV energies. Standard leptonic scenarios require peculi…
Photopion Production in Black-Hole Jets and Flat-Spectrum Radio Quasars as PeV Neutrino Sources
Charles D. Dermer, Kohta Murase, Yoshiyuki Inoue
The IceCube collaboration has reported neutrinos with energies between ~30 TeV and a few PeV that are significantly enhanced over the cosmic-ray induced atmospheric background. Via…