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Record 32 of 272
3-D RPIC simulations of relativistic jets: Particle acceleration, magnetic field generation, and emission
Author and Affiliation:
Nishikawa, K.-I.(National Space Science and Technology Center, Huntsville, AL, United States)
Abstract: Nonthermal radiation observed from astrophysical systems containing (relativistic) jets and shocks, e.g., supernova remnants, active galactic nuclei (AGNs), gamma-ray bursts (GRBs), and Galactic microquasar systems usually have power-law emission spectra. Fermi acceleration is the mechanism usually assumed for the acceleration of particles in astrophysical environments. Recent PIC simulations using injected relativistic electron-ion (electro-positron) jets show that acceleration occurs within the downstream jet, rather than by the scattering of particles back and forth across the shock as in Fermi acceleration. Shock acceleration is a ubiquitous phenomenon in astrophysical plasmas. Plasma waves and their associated instabilities (e.g., the Buneman instability, other two-streaming instability, and the Weibel instability) created in the .shocks are responsible for particle (electron, positron, and ion) acceleration. The simulation results show that the Weibel instability is responsible for generating and amplifying highly nonuniform, small-scale magnetic fields. These magnetic fields 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. We will review recent PIC simulations which show particle acceleration in jets.
Publication Date: Jan 01, 2006
Document ID:
20060013647
(Acquired Jun 01, 2006)
Subject Category: ASTROPHYSICS
Document Type: Conference Paper
Meeting Information: 6th International Conference on High Energy Laboratory of Astrophysics; 11-14 Mar. 2006; Houston, TX; United States
Financial Sponsor: NASA Marshall Space Flight Center; Huntsville, AL, United States
Organization Source: National Space Science and Technology Center; Huntsville, AL, United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: PARTICLE ACCELERATION; MAGNETIC FIELDS; EMISSION SPECTRA; FIELD EMISSION; GAMMA RAY BURSTS; ACTIVE GALACTIC NUCLEI; QUASARS; RELATIVISTIC PARTICLES; WEIBEL INSTABILITY; SUPERNOVA REMNANTS
Availability Source: Other Sources
Availability Notes: Abstract Only
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