Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-10-14
Astropart.Phys.26:378-386,2006
Astronomy and Astrophysics
Astrophysics
11 pages, 8 figures; minor corrections, enlarged discussion, contains an extended review on Galactic magnetic field compared t
Scientific paper
10.1016/j.astropartphys.2006.08.
We study the influence of the regular component of the Galactic magnetic field (GMF) on the arrival directions of ultra-high energy cosmic rays (UHECRs). We find that, if the angular resolution of current experiments has to be fully exploited, deflections in the GMF cannot be neglected even for E=10^20 eV protons, especially for trajectories along the Galactic plane or crossing the Galactic center region. On the other hand, the GMF could be used as a spectrograph to discriminate among different source models and/or primaries of UHECRs, if its structure would be known with sufficient precision. We compare several GMF models introduced in the literature and discuss for the example of the AGASA data set how the significance of small-scale clustering or correlations with given astrophysical sources are affected by the GMF. We point out that the non-uniform exposure to the extragalactic sky induced by the GMF should be taken into account estimating the significance of potential (auto-)correlation signals.
Kachelriess Michael
Serpico Pasquale D.
Teshima Masahiro
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