Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2010-09-20
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
4 pages, 3 figures
Scientific paper
The significant anisotropy in the arrival directions of the 69 events with energy E> 55 EeV detected by Pierre Auger collaboration is located in the 20-degree region centered near Cen A. Not only the 2-point, but also the 3-point and 4-point autocorrelation functions are completely saturated by this region. Besides there is an deficit of events in the direction of Virgo cluster. If one assumes that the excess around Cen A is due to heavy nuclei shifted from Virgo, one can explain 20-degree scale of this anomaly. Also location of the highest energy event between the Cen A region and the Virgo cluster supports this idea. Magnitude and direction of the magnetic field is similar in this case to those expected for Galactic models. The existence of nuclei sources in the sky opens the road for a self-consistent description of Auger data.
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