Origin and propagation of the highest energy cosmic rays

Details Origin and propagation of the highest energy cosmic rays Origin and propagation of the highest energy cosmic rays

1996-12-22

arxiv.org/abs/astro-ph/9612212v1

Astronomy and Astrophysics

Astrophysics

27 pages, 10 figures, uses sprocl.sty, in Towards the Millennium in Astrophysics: Problems and Prospects, Erice 1996, eds. M.M

Scientific paper

In this lecture I give an overview of shock acceleration, interactions of high energy cosmic rays with, and propagation through, the background radiation, and the resulting electron-photon cascade. I argue that while the origin of the highest energy cosmic rays is still uncertain, it is not necessary to invoke exotic models such as emission by topological defects to explain the existing data. It seems likely that shock acceleration at Fanaroff-Riley Class II radio galaxies can account for the existing data. However, new cosmic ray data, as well as better estimates of the extragalactic radiation fields and magnetic fields will be necessary before we will be certain of the origin of the highest energy particles occurring in nature.

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