NONDIFFUSIVE PROPAGATION OF ULTRA-HIGH ENERGY COSMIC-RAYS

We report the results of 3D simulations of non-diffusive propagation o f Ultra High Energy Cosmic Rays (UHECR) (E >10(20) eV) through the int ergalactic and extended halo media. We quantify the expected angular a nd temporal correlations between the events and the sources, and the t emporal delay between protons and gamma-ray counterparts with a common origin for both halo and extragalactic origins. It is shown that the proposed UHECR-supergalactic plane source associations require either extremely high values of the halo magnetic field over as much as 100 k pc length scale or a very large correlation length for the IGM, even f or the largest possible values of the intergalactic magnetic field. It can be stated that the UHECR seem to point to the sources even more s trongly than previously believed. The simulations also show that the c alculated time delays between UHE protons and gamma-ray counterparts d o not match the claimed GRB-UHECR associations for either cosmological or extended halo distance scales. (C) 1997 Elsevier Science B.V.