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Cosmic Ray Helium Hardening
Yutaka Ohira, Kunihito Ioka
Recent observations by CREAM and ATIC-2 experiments suggest that (1) the spectrum of cosmic ray (CR) helium is harder than that of CR proton below the knee 10^15 eV and (2) all CR…
TeV Electron Spectrum for Probing Cosmic-Ray Escape from a Supernova Remnant
Norita Kawanaka, Kunihito Ioka, Yutaka Ohira +1
One of the most essential but uncertain processes for producing cosmic-rays (CRs) and their spectra is how accelerated particles escape into the interstellar space. We propose that…
Gamma rays from molecular clouds illuminated by cosmic rays escaping from interacting supernova remnants
Yutaka Ohira, Kohta Murase, Ryo Yamazaki
Recently, gamma-ray telescopes AGILE and Fermi observed several middle-aged supernova remnants (SNRs) interacting with molecular clouds. It is likely that their gamma rays arise fr…
Design Concepts for the Cherenkov Telescope Array
The CTA Consortium
Ground-based gamma-ray astronomy has had a major breakthrough with the impressive results obtained using systems of imaging atmospheric Cherenkov telescopes. Ground-based gamma-ray…
Slow Diffusion of Cosmic-Rays around a Supernova Remnant
Yutaka Fujita, Yutaka Ohira, Fumio Takahara
We study the escape of cosmic-ray protons accelerated at a supernova remnant (SNR). We are interested in their propagation in interstellar medium (ISM) after they leave the shock n…