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68 papers
Detection of Small Flares from the Crab Nebula with Fermi-LAT
Masanori Arakawa, Masaaki Hayashida, Dmitry Khangulyan +1
Gamma radiation from the Crab pulsar wind nebula (PWN) shows significant variability at MeV energies, recently revealed with spaceborne gamma-ray telescopes. Here we repo…
Synchrotron Gamma-Ray Emission Model of the Giant Outburst of Quasar 3C 279 in 2015 June: Fast Reconnection or Stochastic Acceleration with Electromagnetic Cascade?
Katsuaki Asano, Masaaki Hayashida
We test the synchrotron emission scenario for the very bright gamma-ray flare of blazar 3C 279 observed in 2015 June using time-dependent numerical simulations. A bulk Lorentz fact…
Dependence of accessible dark matter annihilation cross-sections on the density profiles of dwarf spheroidal galaxies with the Cherenkov Telescope Array
Nagisa Hiroshima, Masaaki Hayashida, Kazunori Kohri
Dwarf spheroidal galaxies are excellent targets in gamma-ray searches for dark matter. We consider dark matter searches in dwarf spheroidal galaxies (dSphs) with the Cherenkov Tele…
Multi-messenger observations of a flaring blazar coincident with high-energy neutrino IceCube-170922A
The IceCube, Fermi-LAT, MAGIC +13
Individual astrophysical sources previously detected in neutrinos are limited to the Sun and the supernova 1987A, whereas the origins of the diffuse flux of high-energy cosmic neut…
Blazar Spectra with Hard-sphere-like Acceleration of Electrons
Katsuaki Asano, Masaaki Hayashida
Electrons emitting non-thermal photons in blazars are possibly accelerated by turbulences developed in jets. In this paper, we consider the case so-called hard-sphere scattering as…
Prototyping Hexagonal Light Concentrators Using High-Reflectance Specular Films for the Large-Sized Telescopes of the Cherenkov Telescope Array
Akira Okumura, Dang Viet Tan, Sakiya Ono +8
We have developed a prototype hexagonal light concentrator for the Large-Sized Telescopes of the Cherenkov Telescope Array. To maximize the photodetection efficiency of the focal-p…