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GW150914-like Black Holes as Galactic High-Energy Sources
Kunihito Ioka, Tatsuya Matsumoto, Yuto Teraki +2
The first direct detections of gravitational waves (GWs) from black hole (BH) mergers, GW150914, GW151226 and LVT151012, give a robust lower limit on the number of mer…
Are Ultra-Long Gamma-Ray Bursts Caused by Blue Supergiant Collapsars, Newborn Magnetars, or White Dwarf Tidal Disruption Events?
Kunihito Ioka, Kenta Hotokezaka, Tsvi Piran
Ultra-long gamma-ray bursts (ulGRBs) are a new population of GRBs with extreme durations of s. Leading candidates for their origin are blue supergiant collapsars, mag…
CALET Upper Limits on X-ray and Gamma-ray Counterparts of GW 151226
O. Adriani, Y. Akaike, K. Asano +89
We present upper limits in the hard X-ray and gamma-ray bands at the time of the LIGO gravitational-wave event GW 151226 derived from the CALorimetric Electron Telescope (CALET) ob…
The unreasonable weakness of r-process cosmic rays in the neutron-star-merger nucleosynthesis scenario
Koutarou Kyutoku, Kunihito Ioka
We reach the robust conclusion that, by combining the observed cosmic rays of r-process elements with the fact that the velocity of the neutron-star-merger ejecta is much higher th…