Constrains on the Galactic Magnetic Field from the Two-Dimensional Correlation Function of AGASA Events

Details Constrains on the Galactic Magnetic Field from the Two-Dimensional Correlation Function of AGASA Events Constrains on the Galactic Magnetic Field from the Two-Dimensional Correlation Function of AGASA Events

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....2..747t&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

1

Scientific paper

AGASA has recently shown the results of a two-dimensional correlation analysis in Galactic coordinates of the arrival directions of CR events above 1019 eV. This analysis shows an interesting signature in the form of a linear correlation between galactic latitude and longitude difference for pairs of events at small angle separations (< 10o ). The linear feature is significant up to the 3 σ level and is present at several energy bins above 1019 eV, preserving a constant inclination in the l b plane over that energy range. This feature can be interpreted as the result of the coherent deflection of UHECR over the observed sky by a large scale Galactic halo and disk magnetic field. This result may have important implications for the identity of the UHECR particles as well as for the nature their sources and spatial distribution inside the GZK sphere. The structure and intensity of the Galactic magnetic field, in particular, can be constrained from these observations. In the present work, we depict a galactic magnetic field consistent with this scenario and make predictions for the Auger Observatory observing the Southern sky.

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