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Record 27 of 272
Particle Acceleration, Magnetic Field Generation, and Associated Emission in Collisionless Relativistic Jets
Author and Affiliation:
Nishikawa, K.-I.(NASA Marshall Space Flight Center, Huntsville, AL, United States)
Abstract: Nonthermal radiation observed from astrophysical systems containing relativistic jets and shocks, e.g., active galactic nuclei (AGNs), gamma-ray bursts (GRBs), and Galactic microquasar systems usually have power-law emission spectra. Recent PIC simulations using injected relativistic electron-ion (electro-positron)jets show that acceleration occurs within the downstream jet. 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.
Publication Date: Sep 24, 2007
Document ID:
20070037455
(Acquired Dec 17, 2007)
Subject Category: ASTROPHYSICS
Document Type: Conference Paper
Meeting Information: High Energy Phenomenon in Relativistic Outflows; 24 Sep. 2007; Dublin; Ireland
Financial Sponsor: NASA Marshall Space Flight Center; Huntsville, AL, United States
Organization Source: NASA Marshall Space Flight Center; Huntsville, AL, United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: MAGNETIC FIELDS; ACTIVE GALACTIC NUCLEI; GAMMA RAY BURSTS; PARTICLE ACCELERATION; NONUNIFORM MAGNETIC FIELDS; EMISSION SPECTRA; WEIBEL INSTABILITY; STABILITY; SPACE PLASMAS; SIMULATION
Availability Source: Other Sources
Availability Notes: Abstract Only
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