Astronomy and Astrophysics – Astrophysics
Scientific paper
1995-08-19
Astrophys.J. 455 (1995) L21
Astronomy and Astrophysics
Astrophysics
11 pages with 3 postscript figures; LaTeX with AASTeX macros; uuencoded 3 .eps figures; submitted to the ApJL; a postscript ve
Scientific paper
10.1086/309812
The strength and spectrum of the extragalactic magnetic field are still unknown. Its measurement would help answer the question of whether galactic fields are purely a primordial relic or were dynamically enhanced from a much smaller cosmological seed field. In this letter, we show that the composition, spectrum, and directional distribution of extragalactic ultrahigh energy cosmic rays with energies above $\simeq 10^{18}\ev$ can probe the large scale component of the extragalactic magnetic field below the present observational upper limit of $10^{-9}$ Gauss. Cosmic ray detectors under construction or currently in the proposal stage should be able to test the existence of the extragalactic magnetic fields on scales of a few to tens of Mpc and strengths in the range $\simeq 10^{-10} - 10^{-9}$ Gauss.
Lee Sangjin
Olinto Angela
Sigl Guenter
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