Publications (85)
Search for Diffuse X-rays from the Bow Shock Region of Runaway Star BD+43$^\circ$3654 with Suzaku
Yukikatsu Terada, Makoto S. Tashiro, Aya Bamba +4
A Spatial and Spectral Study of Nonthermal Filaments in Historical Supernova Remnants: Observational Results with Chandra
Aya Bamba, Ryo Yamazaki, Tatsuo Yoshida +2
Tail Emission of Prompt Gamma-Ray Burst Jets
Ryo Yamazaki, Kenji Toma, Kunihito Ioka +1
Full particle simulation of a perpendicular collisionless shock: A shock-rest-frame model
Takayuki Umeda, Ryo Yamazaki
Detailed Investigation of the Gamma-Ray Emission in the Vicinity of SNR W28 with FERMI-LAT
Yoshitaka Hanabata, Hideaki Katagiri, John W. Hewitt +9
A Possible Origin of Bimodal Distribution of Gamma-Ray Bursts
Kenji Toma, Ryo Yamazaki, Takashi Nakamura
The radiative X-ray and gamma-ray efficiencies of rotation powered pulsars
Jacco Vink, Aya Bamba, Ryo Yamazaki
A Unified Model for Gamma-Ray Bursts
Ryo Yamazaki, Kunihito Ioka, Takashi Nakamura +1
Delayed Flashes from Counter Jets of Gamma Ray Bursts
Ryo Yamazaki, Kunihito Ioka, Takashi Nakamura
Efficiency Crisis of Swift Gamma-Ray Bursts with Shallow X-ray Afterglows: Prior Activity or Time-Dependent Microphysics?
Kunihito Ioka, Kenji Toma, Ryo Yamazaki +1
X-Ray Observation of Very High Energy Gamma-Ray Source, HESS J1745-303, with Suzaku
Aya Bamba, Ryo Yamazaki, Kazunori Kohri +4
Cross-scale coupling at a perpendicular collisionless shock
Takayuki Umeda, Masahiro Yamao, Ryo Yamazaki
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
Statistical Properties of Gamma-Ray Burst Polarization
Kenji Toma, Takanori Sakamoto, Bing Zhang +6
Shallow Decay of Early X-ray Afterglows from Inhomogeneous Gamma-Ray Burst Jets
Kenji Toma, Kunihito Ioka, Ryo Yamazaki +1
Possibility of Ultra High-Energy Cosmic Rays from the Giant Flare in SGR 1806-20
Katsuaki Asano, Ryo Yamazaki, Naoshi Sugiyama
The X-ray synchrotron emission of RCW 86 and the implications for its age
Jacco Vink, Johan Bleeker, Kurt van der Heyden +3
Is the PAMELA anomaly caused by the supernova explosions near the Earth?
Yutaka Fujita, Kazunori Kohri, Ryo Yamazaki +1
Synchrotron X-ray diagnostics of cutoff shape of nonthermal electron spectrum at young supernova remnants
Ryo Yamazaki, Yutaka Ohira, Makoto Sawada +1
A Hadronic-Leptonic Model for the Fermi Bubbles: Cosmic-Rays in the Galactic Halo and Radio Emission
Yutaka Fujita, Yutaka Ohira, Ryo Yamazaki
Dynamics and microinstabilities at perpendicular collisionless shock: A comparison of large-scale two-dimensional full particle simulations with different ion to electron mass ratio
Takayuki Umeda, Yoshitaka Kidani, Shuichi Matsukiyo +1
Nonthermal Emission Associated with Strong AGN Outbursts at the Centers of Galaxy Clusters
Yutaka Fujita, Kazunori Kohri, Ryo Yamazaki +1
Discovery of Extended X-Ray emission from the unidentified TeV source HESS J1614-518 using the Suzaku Satellite
Hironori Matsumoto, Hideki Uchiyama, Makoto Sawada +8
Turbulence and Magnetic Field Amplification in Supernova Remnants: Interactions Between A Strong Shock Wave and Multi-Phase Interstellar Medium
Tsuyoshi Inoue, Ryo Yamazaki, Shu-ichiro Inutsuka
Extremely Soft X-ray Flash as the indicator of off-axis orphan GRB afterglow
Yuji Urata, Kuiyun Huang, Ryo Yamazaki +1
Thick Domain Walls Intersecting a Black Hole
Yoshiyuki Morisawa, Ryo Yamazaki, Daisuke Ida +2
Cosmological X-Ray Flashes from Off-Axis Jets
Ryo Yamazaki, Kunihito Ioka, Takashi Nakamura
X-ray Flashes from Off-axis Gamma-Ray Bursts
Ryo Yamazaki, Kunihito Ioka, Takashi Nakamura
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
Spatially-Resolved Spectroscopy of a Balmer-Dominated Shock in the Cygnus Loop: An Extremely Thin Cosmic-Ray Precursor?
Satoru Katsuda, Keiichi Maeda, Yutaka Ohira +9
A Unified Model of Short and Long Gamma-Ray Bursts, X-Ray Rich Gamma-Ray Bursts, and X-Ray Flashes
Ryo Yamazaki, Kunihito Ioka, Takashi Nakamura +1
Multi-Year X-ray Variations of Iron-K and Continuum Emissions in the Young Supernova Remnant Cassiopeia A
Toshiki Sato, Yoshitomo Maeda, Aya Bamba +9
Searching for the Time Variation in Supernova Remnant RX J1713.7-3946
Aytap Sezer, Ryo Yamazaki, Xiaohong Cui +2
A Unified Model of Short and Long Gamma-Ray Bursts, X-Ray Rich Gamma-Ray Bursts, and X-Ray Flashes
Ryo Yamazaki, Kunihito Ioka, Takashi Nakamura
Escape-limited Model of Cosmic-ray Acceleration Revisited
Yutaka Ohira, Kohta Murase, Ryo Yamazaki
Probing the Structure of Gamma-Ray Burst Jets with Steep Decay Phase of their Early X-ray Afterglows
Kentaro Takami, Ryo Yamazaki, Takanori Sakamoto +1
Microinstabilities at perpendicular collisionless shocks: A comparison of full particle simulations with different ion to electron mass ratio
Takayuki Umeda, Yoshitaka Kidani, Shuichi Matsukiyo +1
Gamma rays from molecular clouds illuminated by cosmic rays escaping from interacting supernova remnants
Yutaka Ohira, Kohta Murase, Ryo Yamazaki
The Nature of a Cosmic-Ray Accelerator, CTB37 B, Observed with Suzaku and Chandra
Ryoko Nakamura, Aya Bamba, Manabu Ishida +5
Electron acceleration at a low-Mach-number perpendicular collisionless shock
Takayuki Umeda, Masahiro Yamao, Ryo Yamazaki
Black holes in three-dimensional Einstein-Born-Infeld-dilaton theory
Ryo Yamazaki, Daisuke Ida
Suzaku Analysis of the Supernova Remnant G306.3-0.9 and the Gamma-ray View of Its Neighborhood
Aytap Sezer, Tulun Ergin, Ryo Yamazaki
Evolution of Synchrotron X-rays in Supernova Remnants
Ryoko Nakamura, Aya Bamba, Tadayasu Dotani +3
Electron acceleration with improved Stochastic Differential Equation method: cutoff shape of electron distribution in test-particle limit
Ryo Yamazaki, Tatsuo Yoshida, Yuka Tsuchihashi +3
Prior Emission Model for X-ray Plateau Phase of Gamma-Ray Burst Afterglows
Ryo Yamazaki
Suzaku Observations of the Non-thermal Supernova Remnant HESS J1731-347
Aya Bamba, Gerd Puehlhofer, Fabio Acero +7
Constraints On the Diffusive Shock Acceleration From the Nonthermal X-ray Thin Shells In SN1006 NE Rim
Ryo Yamazaki, Tatsuo Yoshida, Toshio Terasawa +2
Two-dimensional full particle simulation of a perpendicular collisionless shock with a shock-rest-frame model
Takayuki Umeda, Masahiro Yamao, Ryo Yamazaki
Near-Infrared Colors of Gamma-Ray Burst Afterglows and Cosmic Reionization History
Akio K. Inoue, Ryo Yamazaki, Takashi Nakamura
Peak Energy-Isotropic Energy Relation in the Off-Axis Gamma-Ray Burst Model
Ryo Yamazaki, Kunihito Ioka, Takashi Nakamura
High-energy emission as a test of the prior emission model for gamma-ray burst afterglows
Kohta Murase, Kenji Toma, Ryo Yamazaki +2
Gamma-ray spectrum of RX J1713.7-3946 in the Fermi era and future detection of neutrinos
Ryo Yamazaki, Kazunori Kohri, Hideaki Katagiri
TeV Gamma-Rays from Old Supernova Remnants
Ryo Yamazaki, Kazunori Kohri, Aya Bamba +3
The Fermi Bubbles as a Scaled-up Version of Supernova Remnants
Yutaka Fujita, Yutaka Ohira, Ryo Yamazaki
X-ray Evolution of Pulsar Wind Nebulae
Aya Bamba, Takayasu Anada, Tadayasu Dotani +4
Chandra Observations of A Galactic Supernova Remnant Vela Jr.: A New Sample of Thin Filaments Emitting Synchrotron X-Rays
Aya Bamba, Ryo Yamazaki, Junko S. Hiraga
Suzaku Observation of the RCW86 Northeastern Shell
Hiroya Yamaguchi, Katsuji Koyama, Hiroshi Nakajima +4
X-ray Spectroscopy of the Mixed Morphology Supernova Remnant W28 with XMM-Newton
Ryoko Nakamura, Aya Bamba, Manabu Ishida +6
Entropy at the Outskirts of Galaxy Clusters as Implications for Cosmological Cosmic-Ray Acceleration
Yutaka Fujita, Yutaka Ohira, Ryo Yamazaki
Relativistic Electron Shock Drift Acceleration in Low Mach Number Galaxy Cluster Shocks
Shuichi Matsukiyo, Yutaka Ohira, Ryo Yamazaki +1
Two-Step Acceleration Model of Cosmic Rays at Middle-Aged SNR
Tsuyoshi Inoue, Ryo Yamazaki, Shu-ichiro Inutsuka
Prospects for Detecting Gamma-Ray Bursts at Very High Energies with the Cherenkov Telescope Array
Jun Kakuwa, Kohta Murase, Kenji Toma +3
A possible observational evidence for $θ^{-2}$ angular distribution of opening half-angle of GRB jets
Daisuke Yonetoku, Ryo Yamazaki, Takashi Nakamura +1
Suzaku observations of the hard X-ray spectrum of Vela Jr
Sawako Takeda, Aya Bamba, Yukikatsu Terada +5
Giant flare of SGR 1806-20 from a relativistic jet
Ryo Yamazaki, Kunihito Ioka, Fumio Takahara +1
Absolute Rate, Evolving Luminosity function, and Evolving Jet Opening Angle Distribution for Long Gamma-Ray Bursts
Tatsushi Matsubayashi, Ryo Yamazaki, Daisuke Yonetoku +2
GRB980425 in the Off-Axis Jet Model of the Standard GRBs
Ryo Yamazaki, Daisuke Yonetoku, Takashi Nakamura
Optical-infrared flares and radio afterglows by Jovian planets inspiraling into their host stars
Ryo Yamazaki, Kimitake Hayasaki, Abraham Loeb
Toward Understanding the Cosmic-ray Acceleration at Young Supernova Remnants Interacting with Interstellar Clouds: Possible Applications to RX J1713.7-3946
Tsuyoshi Inoue, Ryo Yamazaki, Shu-ichiro Inutsuka +1
Escape of cosmic-ray electrons from supernova remnants
Yutaka Ohira, Ryo Yamazaki, Norita Kawanaka +1
A Unified Model of the Prompt Optical Emission of Gamma-Ray Bursts
Hirotsugu Doi, Kentaro Takami, Ryo Yamazaki
Testing the External Shock Model of Gamma-Ray Bursts using the Late-Time Simultaneous Optical and X-ray Afterglows
Yuji Urata, Ryo Yamazaki, Takanori Sakamoto +21
Fine Structures of Shock of SN 1006 with the Chandra Observation
Aya Bamba, Ryo Yamazaki, Masaru Ueno +1
A critical shock Mach number for particle acceleration in the absence of pre-existing cosmic rays: $M=\sqrt 5$
Jacco Vink, Ryo Yamazaki
Cosmological X-ray Flashes in the Off-Axis Jet Model
Ryo Yamazaki, Kunihito Ioka, Takashi Nakamura
Ep-Eiso Correlation in a Multiple Subjet Model of Gamma-Ray Bursts
Kenji Toma, Ryo Yamazaki, Takashi Nakamura
Inverse Compton emission from a cosmic-ray precursor in RX J1713.7-3946
Yutaka Ohira, Ryo Yamazaki
Gravitational Wave Memory of Gamma-Ray Burst Jets
Norichika Sago, Kunihito Ioka, Takashi Nakamura +1
An Off-Axis Jet Model For GRB980425 and Low Energy Gamma-Ray Bursts
Ryo Yamazaki, Daisuke Yonetoku, Takashi Nakamura
Electromagnetic Afterglows Associated with Gamma-Ray Emission Coincident with Binary Black Hole Merger Event GW150914
Ryo Yamazaki, Katsuaki Asano, Yutaka Ohira
Optical inverse-Compton emission from clusters of galaxies
Ryo Yamazaki, Abraham Loeb
Turbulent Cosmic Ray Reacceleration at Radio Relics and Halos in Clusters of Galaxies
Yutaka Fujita, Motokazu Takizawa, Ryo Yamazaki +2
Origin of Radially Aligned Magnetic Fields in Young Supernova Remnants
Tsuyoshi Inoue, Jiro Shimoda, Yutaka Ohira +1
On cosmic-ray production efficiency at supernova remnant shocks propagating into realistic diffuse interstellar medium
Jiro Shimoda, Tsuyoshi Inoue, Yutaka Ohira +3
Investigating the X-ray and Gamma-ray Properties of the Galactic Supernova Remnants Kes 69, 3C 396, 3C 400.2
Tülün Ergin, Aytap Sezer, Ryo Yamazaki