Abstract
Using a three dimensional relativistic particle-in-cell code we have performed numerical experiments of plasma shells colliding at relativistic velocities. Such scenarios are found in many astrophysical objects e.g. the relativistic outflow from gamma ray bursts, active galactic nuclei jets and supernova remnants. We show how a Weibel like two-stream instability is capable of generating small- scale magnetic filaments with strength up to percents of equipartition. Such field topology is ideal for the generation of jitter radiation as opposed to synchrotron radiation. We also explain how the field generating mechanism involves acceleration of electrons to power law distributions (N(γ) ∞ γ−p) through a non-Fermi acceleration mechanism. The results add to our understanding of collisionless shocks.
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References
Baring, M.G. and Braby, M.L. (2004). ApJ, 613:460–476.
Frederiksen, J. T., Hededal, C. B., Haugboelle, T., and & Nordlund, Aa (2003). Proceedings of the 2002 Niels Bohr Summer Institute, ArXiv Astrophysics e-prints, astro-ph/0303360.
Frederiksen, J. T., Hededal, C. B., Haugboelle, T., and Nordlund, Aa. (2004). ApJL, 608:L13–L16.
Hededal, C. B., Haugboelle, T., Frederiksen, J. T., and & Nordlund, Aa (2004). Submitted to ApJL, astro-ph/0408558.
Medvedev, M. V., Fiore, M., Fonseca, R., Silva, L., and Mori, W. (2004). submitted to ApJ, astro-ph/0409382.
Medvedev, M. V. and Loeb, A. (1999). ApJ, 526:697–706.
Nishikawa, K.-I., Hardee, P., Richardson, G., Preece, R., Sol, H., and Fishman, G. J. (2003). ApJ, 595:555–563.
Nishikawa, K.-I., Hardee, P., Richardson, G., Preece, R., Sol, H., and Fishman, G. J. (2004). Submitted to ApJ, astro-ph/0409702.
Silva, L. O., Fonseca, R. A., Tonge, J. W., Dawson, J. M., Mori, W. B., and Medvedev, M. V. (2003). ApJL, 596:L121–L124.
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Hededal, C.B., Frederiksen, J.T., Haugboelle, T., Nordlund, A. (2005). Magnetic Field Generation and Electron Acceleration in Collisionless Shocks. In: Shapiro, M.M., Stanev, T., Wefel, J.P. (eds) Neutrinos and Explosive Events in the Universe. NATO Science Series, vol 209. Springer, Dordrecht. https://doi.org/10.1007/1-4020-3748-1_15
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DOI: https://doi.org/10.1007/1-4020-3748-1_15
Publisher Name: Springer, Dordrecht
Print ISBN: 978-1-4020-3746-7
Online ISBN: 978-1-4020-3748-1
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