UHECRs from magnetic reconnection in relativistic jets

Details UHECRs from magnetic reconnection in relativistic jets UHECRs from magnetic reconnection in relativistic jets

2010-07-09

arxiv.org/abs/1007.1522v2

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

5 pages, 2 figures, MNRAS Letters, in press, Sect. 3.3 added to match the published version

Scientific paper

Ultra-high energy cosmic rays (UHECRs) may be produced in active galactic nuclei (AGN) or gamma-ray burst (GRB) jets. I argue that magnetic reconnection in jets can accelerate UHECRs rather independently of physical processes in the magnetic dissipation region. First order Fermi acceleration can efficiently take place in the region where the unreconnected (upstream) magnetized fluid converges into the reconnection layer. I find that protons can reach energies up to E~10^{20} eV in GRB and powerful AGN jets while iron nuclei can reach similar energies in AGN jets of more moderate luminosity.

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