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Microscopic Processes On Radiation from Accelerated Particles in Relativistic JetsNonthermal radiation observed from astrophysical systems containing relativistic jets and shocks, e.g., gamma-ray bursts (GRBs), active galactic nuclei (AGNs), and Galactic microquasar systems usually have power-law emission spectra. Recent PIC simulations of relativistic electron-ion (electro-positron) jets injected into a stationary medium show that particle acceleration occurs within the downstream jet. In the collisionless relativistic shock particle acceleration is due to plasma waves and their associated instabilities (e.g., the Buneman instability, other two-streaming instability, and the Weibel (filamentation) 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.
Document ID
20090028675
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Nishikawa, K.-I.
(Alabama Univ. Huntsville, AL, United States)
Hardee, P. E.
(Alabama Univ. Tuscaloosa, AL, United States)
Mizuno, Y.
(Alabama Univ. Huntsville, AL, United States)
Medvedev, M.
(Kansas Univ. Lawrence, KS, United States)
Zhang, B.
(Nevada Univ. Las Vegas, NV, United States)
Sol, H.
(Observatoire de Paris-Meudon France)
Niemiec, J.
(Institute of Nuclear Physics Cracow, Poland)
Pohl, M.
(Iowa State Univ. Ames, IA, United States)
Nordlund, A.
(Copenhagen Univ. Denmark)
Fredriksen, J.
(Copenhagen Univ. Denmark)
Lyubarsky, Y.
(Ben Gurion Univ. of the Negev Beersheva, Israel)
Hartmann, D. H.
(Clemson Univ. SC, United States)
Fishman, G. J.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 24, 2013
Publication Date
June 15, 2009
Subject Category
Astrophysics
Report/Patent Number
M09-0403
Meeting Information
Meeting: Modern Challenges in Nonliner Plasma Physics
Location: Halkidiki
Country: Greece
Start Date: June 15, 2009
End Date: June 19, 2009
Distribution Limits
Public
Copyright
Other

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