Data Centre for Astrophysics
Astronomy Department of the University of Geneva
ISDC Seminar

Tuesday, 13 November 2007 at 14:00

Dmitry Semikoz
AstroParticule et Cosmologie (APC), Université Paris 7

Correlation of ultra-high energy cosmic rays with nearby astrophysical sources observed by the Pierre Auger Observatory

Abstract. The Pierre Auger Observatory (close to completion of construction in Argentina) has collected ~9000 km2 sr yr of exposure at the energies E>1019 eV during the period 2004-2007. This is the highest exposure achieved by any ultra-high-energy cosmic ray (UHECR) experiment. The large exposure has enabled to detect the so-called Greisen-Zatsepin-Kuzmin (GZK) cut-off in the UHECR spectrum with a significance of more than 6 sigma. The detection of this cut-off provides evidence for an astrophysical origin of UHECR sources. In this talk I will present recent results on correlation of arrival directions of UHECR events with sky positions of nearby astronomical sources. These results open a new field of UHECR astronomy.

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