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arXiv:0706.2864 (astro-ph)
[Submitted on 19 Jun 2007 (v1), last revised 13 Feb 2008 (this version, v3)]

Title:Astrophysical interpretation of the medium scale clustering in the ultra-high energy sky

Authors:A. Cuoco, G. Miele, P. D. Serpico
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Abstract: 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.
Comments: 10 pages, 7 figures; one reference added
Subjects: Astrophysics (astro-ph); High Energy Physics - Phenomenology (hep-ph)
Report number: DSF/20/2007, FERMILAB-PUB-07-212-A, IFIC-07-30
Cite as: arXiv:0706.2864 [astro-ph]
  (or arXiv:0706.2864v3 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0706.2864
Journal reference: Phys.Lett.B660:307-314,2008
Related DOI: https://doi.org/10.1016/j.physletb.2007.12.054

Submission history

From: Pasquale Dario Serpico [view email]
[v1] Tue, 19 Jun 2007 20:05:14 UTC (760 KB)
[v2] Tue, 12 Feb 2008 11:28:13 UTC (763 KB)
[v3] Wed, 13 Feb 2008 22:37:42 UTC (763 KB)
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