21 citations · 110 across the 9 of their papers we have counts for
5 papers · 1 filter
Large-scale Magnetic Field Model of GRB Afterglow Polarization: Effects of Field Anisotropy, Off-axis Viewing Angle, and Ordered Field
Asuka Kuwata, Kenji Toma, Sara Tomita +1
The afterglows of gamma-ray bursts are non-thermal electron synchrotron emissions from relativistic shocks. The origin of strong magnetic field in the emission region remains elusi…
Synchrotron Polarization of Gamma-Ray Burst Afterglow Shocks with Hydrodynamic-scale Turbulent Magnetic Field
Asuka Kuwata, Kenji Toma, Shigeo S. Kimura +2
Afterglows of gamma-ray bursts (GRBs) are emitted from expanding forward shocks, which are expected to have magnetic field much stronger than the interstellar field, although the o…
Interaction of a Relativistic Magnetized Collisionless Shock with a Dense Clump
Sara Tomita, Yutaka Ohira, Shigeo S. Kimura +2
The interactions between a relativistic magnetized collisionless shock and dense clumps have been expected to play a crucial role on the magnetic field amplification and cosmic-ray…
Weibel-Mediated Shocks Propagating into Inhomogeneous Electron-Positron Plasmas
Sara Tomita, Yutaka Ohira, Ryo Yamazaki
The external forward shock emitting the gamma-ray burst (GRB) afterglow is collisionless, and it is mediated by the Weibel instability which generates the magnetic field. The GRB a…
Weibel instability driven by spatially anisotropic density structures
Sara Tomita, Yutaka Ohira
Observations of afterglows of gamma-ray bursts suggest (GRBs) that post-shock magnetic fields are strongly amplified to about 100 times the shock-compressed value. The Weibel insta…