Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2011-10-04
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
8 pages, 5 figures, LC10 Workshop on "New Physics: complementarities between direct and indirect searches", INFN Frascati, 30
Scientific paper
Recent results from the Pierre Auger Observatory are presented, focusing on a measurement of the cosmic-ray energy spectrum above 10^18 eV, cosmic-ray composition, and the anisotropy in the cosmic ray arrival directions. The flux of cosmic rays can be well described by a broken power-law, with a flattening of the spectrum above 4x10^18 eV and a softening of the spectrum beginning at about 3x10^19 eV. The flux suppression at highest energies is consistent with the predictions of Greisen, and Zatsepin and Kuzmin. Longitudinal development of cosmic-ray air showers provides information on the mass of the primary particle. When compared to model predictions, our measurements of the mean and spread of the longitudinal position of the shower maximum are indicating a composition transition from light to heavier with increasing energy. For highest energies in our data-set we observe evidence for a correlation between the cosmic-ray arrival directions and the nearby extragalactic objects.
for the Pierre Auger Collaboration
Veberic Darko
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