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New Class of High-Energy Transients from Crashes of Supernova Ejecta with Massive Circumstellar Material Shells
Kohta Murase, Todd A. Thompson, Brian C. Lacki +1
A new class of core-collapse supernovae (SNe) has been discovered in recent years by optical/infrared surveys; these SNe suggest the presence of one or more extremely dense (~10^5-…
On the Implications of Late Internal Dissipation for Shallow-Decay Afterglow Emission and Associated High-Energy Gamma-Ray Signals
Kohta Murase, Kenji Toma, Ryo Yamazaki +1
The origin of the shallow-decay emission during early X-ray afterglows has been an open issue since the launch of the Swift satellite. One of the appealing models is the late inter…
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…
Neutrino Background Flux from Sources of Ultrahigh-Energy Cosmic-Ray Nuclei
Kohta Murase, John F. Beacom
Motivated by Pierre Auger Observatory results favoring a heavy nuclear composition for ultrahigh-energy (UHE) cosmic rays, we investigate implications for the cumulative neutrino b…
Very-High-Energy Gamma-Ray Signal from Nuclear Photodisintegration as a Probe of Extragalactic Sources of Ultrahigh-Energy Nuclei
Kohta Murase, John F. Beacom
It is crucial to identify the ultrahigh-energy cosmic-ray (UHECR) sources and probe their unknown properties. Recent results from the Pierre Auger Observatory favor a heavy nuclear…