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Record 34 of 152
Particle acceleration, magnetic field generation, and emission in relativistic pair jets
Author and Affiliation:
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., Dept. of Astrophysics, Copenhagen, Denmark)
Kouveliotou, C.(NASA Marshall Space Flight Center, Huntsville, AL, United States)
Fishman, G. J.(NASA Marshall Space Flight Center, Huntsville, AL, United States)
Mizuno, Y.(NASA Marshall Space Flight Center, Huntsville, AL, United States)
Abstract: Shock acceleration is a ubiquitous phenomenon in astrophysical plasmas. Recent simulations show that the Weibel instability created by relativistic pair jets is 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. The Weibel instability created in the collisionless shock accelerates particles perpendicular and parallel to the jet propagation direction. This instability is also 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.
Publication Date: Jan 01, 2005
Document ID:
20050205817
(Acquired Aug 30, 2005)
Subject Category: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Document Type: Preprint
Meeting Information: Ultra-Relativistic Jets in Astrophysics Observations, Theory , Simulations; 11-15 Jul. 2005; Banff, Alberta; Canada
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: PARTICLE ACCELERATION; RELATIVISTIC PARTICLES; EMISSION; NONUNIFORM MAGNETIC FIELDS; SIMULATION; WEIBEL INSTABILITY; GAMMA RAY BURSTS; POSITRONS; DEFLECTION; SUPERNOVA REMNANTS; VIBRATION
Availability Source: Other Sources
Availability Notes: Abstract Only
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