Hededal, C. B. and Haugbølle, T. and Frederiksen, J. T. and Nordlund, Å. (2005) In situ particle acceleration in collisionless shocks. Il nuovo cimento C, 28 (3). pp. 411-414. ISSN 1826-9885
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Abstract
The outflows from gamma-ray bursts, active galactic nuclei and relativistic jets in general interact with the surrounding media through collisionless shocks. With three dimensional relativistic particle-in-cell simulations we investigate such shocks. The results from these experiments show that small-scale magnetic filaments with strengths of up to percents of equipartition are generated and that electrons are accelerated to power law distributions N(γ) ∝ γ−p in the vicinity of the filaments through a new acceleration mechanism. The acceleration is locally confined, instantaneous and differs from recursive acceleration processes such as Fermi acceleration. We find that the proposed acceleration mechanism competes with thermalization and becomes important at high Lorentz factors.
| Item Type: | Article |
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| Additional Information: | Paper presented at the “4th Workshop on Gamma-Ray Burst in the Afterglow Era”, Rome, October 18-22, 2004. |
| Uncontrolled Keywords: | Relativistic plasmas ; Microinstabilities (ion-acoustic, two-stream, loss-cone, beamplasma, drift, ion- or electron-cyclotron, etc.) ; Shock waves and discontinuities ; γ-ray sources; γ-ray bursts |
| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 16 Mar 2020 10:35 |
| Last Modified: | 16 Mar 2020 10:35 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/15674 |
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