Cosmic Ray Acceleration in Hydromagnetic Flux Tubes
| Autor: | James Matthews, Anabella T. Araudo, Anthony R. Bell, Katherine M. Blundell |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Physics
High Energy Astrophysical Phenomena (astro-ph.HE) Flux tube 010308 nuclear & particles physics Turbulence Radio galaxy Astrophysics::High Energy Astrophysical Phenomena Flux FOS: Physical sciences Astronomy and Astrophysics Cosmic ray Fermi acceleration 01 natural sciences Computational physics Bohm diffusion Acceleration Space and Planetary Science 0103 physical sciences Astrophysics - High Energy Astrophysical Phenomena 010303 astronomy & astrophysics |
| Popis: | We find that hydromagnetic flux tubes in back-flows in the lobes of radio galaxies offer a suitable environment for the acceleration of cosmic rays (CR) to ultra-high energies. We show that CR can reach the Hillas (1984) energy even if the magnetised turbulence in the flux tube is not sufficiently strong for Bohm diffusion to apply. First-order Fermi acceleration by successive weak shocks in a hydromagnetic flux tube is shown to be equivalent to second-order Fermi acceleration by strong turbulence. Accepted for publication in the Monthly Notices of the Royal Astronomical Society on 31st May 2019 |
| Databáze: | OpenAIRE |
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