448 citations · 7.1k across the 144 of their papers we have counts for
7 papers · 1 filter
Turbulent Cosmic Ray Reacceleration at Radio Relics and Halos in Clusters of Galaxies
Yutaka Fujita, Motokazu Takizawa, Ryo Yamazaki +2
Radio relics are synchrotron emission found on the periphery of galaxy clusters. From the position and the morphology, it is often believed that the relics are generated by cosmic-…
Optical-infrared flares and radio afterglows by Jovian planets inspiraling into their host stars
Ryo Yamazaki, Kimitake Hayasaki, Abraham Loeb
When a planet inspirals into its host star, it releases gravitational energy which is converted into an expanding bubble of hot plasma. We study the radiation from the bubble and s…
Optical inverse-Compton emission from clusters of galaxies
Ryo Yamazaki, Abraham Loeb
Shocks around clusters of galaxies accelerate electrons which upscatter the Cosmic Microwave Background photons to higher-energies. We use an analytical model to calculate this inv…
Can we explain AMS-02 antiproton and positron excesses simultaneously by nearby supernovae without pulsars nor dark matter?
Kazunori Kohri, Kunihito Ioka, Yutaka Fujita +1
We explain the excess of the antiproton fraction recently reported by the AMS-02 experiment by considering collisions between cosmic-ray protons accelerated by a local supernova re…
Extremely Soft X-ray Flash as the indicator of off-axis orphan GRB afterglow
Yuji Urata, Kuiyun Huang, Ryo Yamazaki +1
We verified the off-axis jet model of X-ray flashes (XRFs) and examined a discovery of off-axis orphan gamma-ray burst (GRBs) afterglows. The XRF sample was selected on the basis o…
Electron acceleration with improved Stochastic Differential Equation method: cutoff shape of electron distribution in test-particle limit
Ryo Yamazaki, Tatsuo Yoshida, Yuka Tsuchihashi +3
We develop a method of stochastic differential equation to simulate electron acceleration at astrophysical shocks. Our method is based on Itô's stochastic differential equations co…