The toes of the ultra high energy cosmic ray spectrum

Details The toes of the ultra high energy cosmic ray spectrum The toes of the ultra high energy cosmic ray spectrum

1999-06-18

arxiv.org/abs/astro-ph/9906309v2

JHEP 9908 (1999) 022

Astronomy and Astrophysics

Astrophysics

22 pages, uses JHEP.cls

Scientific paper

10.1088/1126-6708/1999/08/022

We study the effects of the galactic magnetic field on the ultra high energy cosmic ray propagation. We show that the deflections of the cosmic ray trajectories can have many important implications such as (de)magnification of the cosmic ray fluxes by lensing effects (which can modify the spectrum of individual sources), the formation of multiple images of a source or the existence of regions of the sky to which the Earth is almost blind. The appearance of image pairs is related to the existence of critical curves in the magnification maps, which divide regions in the sky where the images have opposite parities. The results are pictorially illustrated as the stretching and folding of a `sheet' describing the sky seen on Earth. Making use of the most energetic AGASA events we emphasize the need to know the cosmic ray composition and the structure of the magnetic field when attempting to do detailed cosmic ray astronomy.

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