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Particle Acceleration, Magnetic Field Generation, and Emission in Relativistic Pair JetsShock acceleration is a ubiquitous phenomenon in astrophysical plasmas. Plasma waves and their associated instabilities (e.g., the Buneman instability, two-streaming instability, and the Weibel instability) created by relativistic pair jets are responsible for particle (electron, positron, and ion) acceleration. Using a 3-D relativistic electromagnetic particle (REMP) code, we have investigated particle acceleration associated with a relativistic jet propagating through an ambient plasma with and without initial magnetic fields. The growth rates of the Weibel instability depends on the distribution of pair jets. Simulations show that the Weibel instability created in the collisionless shock accelerates particles perpendicular and parallel to the jet propagation direction. The simulation results show that this instability is responsible for generating and amplifying highly nonuniform, small-scale magnetic fields, which contribute to the electron's transverse deflection behind the jet head. The "jitter" radiation from deflected electrons has different properties than synchrotron radiation which is calculated in a uniform magnetic field. This jitter radiation may be important to understanding the complex time evolution and/or spectral structure in gamma-ray bursts, relativistic jets, and supernova remnants.
Document ID
20050237045
Document Type
Preprint (Draft being sent to journal)
Authors
Nishikawa, K.-I. (National Space Science and Technology Center Huntsville, AL, United States)
Ramirez-Ruiz, E. (Institute of the Aerospace Sciences New York, NY, United States)
Hardee, P. (Alabama Univ. Tuscaloosa, AL, United States)
Hededal, C. (Niels Bohr Inst. Copenhagen, Denmark)
Mizuno, Y. (National Space Science and Technology Center Huntsville, AL, United States)
Date Acquired
August 23, 2013
Publication Date
January 1, 2005
Subject Category
Plasma Physics
Meeting Information
Research Training Network School. GRBS: The first three hours(Santorini)
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.