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Particle acceleration at ultrarelativistic, perpendicular shock fronts

MPS-Authors
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Kirk,  John G.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Reville,  Brian
Brian Reville, Astrophysical Plasma Theory (APT) - Max Planck Research Group, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

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Huang,  Zhi-Qiu
Brian Reville, Astrophysical Plasma Theory (APT) - Max Planck Research Group, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

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2212.02349.pdf
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Citation

Kirk, J. G., Reville, B., & Huang, Z.-Q. (2023). Particle acceleration at ultrarelativistic, perpendicular shock fronts. Monthly Notices of the Royal Astronomical Society, 519(1), 1022-1029. doi:10.1093/mnras/stac3589.


Cite as: https://hdl.handle.net/21.11116/0000-000D-9DEF-6
Abstract
Using an eigenfunction expansion to solve the transport equation, complemented by Monte Carlo simulations, we show that ultrarelativistic shocks can be effective particle accelerators even when they fail to produce large amplitude turbulence in the downstream plasma. This finding contradicts the widely held belief that a uniform downstream magnetic field perpendicular to the shock normal inhibits acceleration by the first-order Fermi process. In the ultrarelativistic limit, we find a stationary power-law particle spectrum of index s = 4.17 for these shocks, close to that predicted for a strictly parallel shock.