Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-06-19
Phys.Lett.B660:307-314,2008
Astronomy and Astrophysics
Astrophysics
10 pages, 7 figures; one reference added
Scientific paper
10.1016/j.physletb.2007.12.054
We compare the clustering properties of the combined dataset of ultra-high energy cosmic rays events, reported by the AGASA, HiRes, Yakutsk and Sugar collaborations, with a catalogue of galaxies of the local universe (redshift z<~0.06). We find that the data reproduce particularly well the clustering properties of the nearby universe within z <~0.02. There is no statistically significant cross-correlation between data and structures, although intriguingly the nominal cross-correlation chance probability drops from ~50% to ~10% using the catalogue with a smaller horizon. Also, we discuss the impact on the robustness of the results of deflections in some galactic magnetic field models used in the literature. These results suggest a relevant role of magnetic fields (possibly extragalactic ones, too) and/or possibly some heavy nuclei fraction in the UHECRs. The importance of a confirmation of these hints by Auger data is emphasized.
Cuoco Alessandro
Miele Gennaro
Serpico Pasquale D.
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