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TeV cosmic ray electrons from millisecond pulsars
Shota Kisaka, Norita Kawanaka
Recent γ-ray observations suggest that the γ-ray millisecond pulsar (MSP) population is separated into two sub-classes with respect to the pair multiplicity. Here, we calculate the…
Escape of cosmic-ray electrons from supernova remnants
Yutaka Ohira, Ryo Yamazaki, Norita Kawanaka +1
We investigate escape of cosmic ray (CR) electrons from a supernova remnant (SNR) to interstellar space. We show that CR electrons escape in order from high energies to low energie…
Gamma-Ray Burst without Baryonic and Magnetic Load?
Kunihito Ioka, Yutaka Ohira, Norita Kawanaka +1
We show that, contrary to common belief, internal shocks can arise in an accelerating radiation-dominated jet if it is confined even weakly to a converging opening angle because th…
Possible Origin of Rapid Variability of Gamma-Ray Bursts due to Convective Energy Transfer in Hyperaccretion Disks
Norita Kawanaka, Kazunori Kohri
We investigate the effects of the convection in the hyperaccretion disk around a stellar-mass black hole, which is considered to be the central engine of gamma-ray bursts (GRBs), w…
Positron annihilation as a cosmic-ray probe
Yutaka Ohira, Kazunori Kohri, Norita Kawanaka
Recently, the gamma-ray telescopes AGILE and Fermi observed several middle-aged supernova remnants (SNRs) interacting with molecular clouds. A plausible emission mechanism of the g…