Other
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1040..211t&link_type=abstract
KEK COSMOPHYSICS GROUP INAUGURAL CONFERENCE ``ACCELERATORS IN THE UNIVERSE'': Interplay between High Energy Physics and Cosmophy
Other
Cosmic Rays, Galactic Halo, Accretion And Accretion Disks, Background Radiations, Gravitational Radiation, Magnetic Fields, And Other Observations, Astronomical And Space-Research Instrumentation
Scientific paper
We investigate the possibility that observations of ultra-high-energy cosmic-rays (UHE-CRs) in the near future may be able to unveil their local source distribution. In order to discuss this possibility, we simulate the arrival distribution of UHE protons taking into account their propagation process in intergalactic space with a realistic model of extragalactic magnetic field (EGMF) and investigate the similarity of the spatial patterns of the arrival distribution and the source distribution. We find that UHE protons above 1019.8 eV are the best indicators for unravelling the source distribution within 100 Mpc, and the detection of about 500 events on the whole sky would allow us to unveil the local structure of the UHE universe for plausible EGMF strength and source number density. This number of events could be detected by 5 years observation by the Pierre Auger Observatory (PAO). We also discuss the deflection of the trajectories of UHE protons by Galactic magnetic field. On the GMF models which are preferred by many observations, the deflection angles are consistent with the angular scale of the positional correlation reported by the PAO, and cosmic-ray observation in the northern hemisphere is preferred to that in the southern hemisphere due to the smaller deflections of UHE protons.
Sato Katsuhiko
Takami Hajime
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