GZK Violation - a Tempest in a (Magnetic) Teapot?

Details GZK Violation - a Tempest in a (Magnetic) Teapot? GZK Violation - a Tempest in a (Magnetic) Teapot?

1999-06-27

arxiv.org/abs/astro-ph/9906431v2

Phys.Rev.Lett. 84 (2000) 3527

Astronomy and Astrophysics

Astrophysics

12 pages, revtex style, accepted for publication in PRL

Scientific paper

10.1103/PhysRevLett.84.3527

The apparent lack of suitable astrophysical sources for the observed highest energy cosmic rays (UHECRs) within $\approx 20$ Mpc is the "GZK Paradox". We constrain representative models of the extra-galactic magnetic field structure by Faraday Rotation measurements; limits are at the $\mu$G level rather than the nG level usually assumed. In such fields, even the highest energy cosmic rays experience large deflections. This allows nearby AGNs (possibly quiet today) or GRBs to be the source of ultra-high energy cosmic rays without contradicting the GZK distance limit.

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