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A Relativistic Electron-Positron Outflow from a Tepid Fireball
Katsuaki Asano, Fumio Takahara
Through detailed numerical simulations, we demonstrate that relativistic outflows (Lorentz factor ) of electron-positron pairs can be produced by radiative acceleration ev…
Prompt High-Energy Emission from Proton-Dominated Gamma-Ray Bursts
Katsuaki Asano, Susumu Inoue, Peter Mészáros
The prompt emission of gamma-ray bursts (GRBs) is widely thought to be radiation from accelerated electrons, but an appreciably larger amount of energy could be carried by accelera…
Secondary Photons from High-energy Protons Accelerated in Hypernovae
K. Asano, P. Mészáros
Recent observations show that hypernovae may deposit some fraction of their kinetic energy in mildly relativistic ejecta. In the dissipation process of such ejecta in a stellar win…
Prompt GeV-TeV Emission of Gamma-Ray Bursts Due to High-Energy Protons, Muons and Electron-Positron Pairs
Katsuaki Asano, Susumu Inoue
In the framework of the internal shock scenario, we model the broadband prompt emission of gamma-ray bursts (GRBs) with emphasis on the GeV-TeV bands, utilizing Monte Carlo simulat…
Generation of a Fireball in AGN Hot Plasmas
Katsuaki Asano, Fumio Takahara
Motivated by relativistic jets observed in active galactic nuclei (AGN), we simulate outflows of electron-positron pairs strongly coupled with photons from normal electron-proton p…
Very High Energy Neutrinos Originating from Kaons in Gamma-Ray Bursts
K. Asano, S. Nagataki
We simulate neutrino production in a gamma-ray burst (GRB) with the most detailed method to date. We show that the highest energy neutrinos from GRBs mainly come from kaons. Althou…