Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.4501m&link_type=abstract
American Astronomical Society, HEAD meeting #11, #45.01; Bulletin of the American Astronomical Society, Vol. 41, p.736
Astronomy and Astrophysics
Astronomy
Scientific paper
Since the first detection of a cosmic ray event with energy above 1020 eV in 1962, their nature and origin remain unknown. Due to the extreme rarity of these ultra high energy cosmic rays, they must be observed indirectly through the observation of extensive air showers, and the lack of knowledge of hadronic interactions at these energies leads to inherent difficulties in characterizing the properties of the primary particle.
A new generation cosmic ray detector, The Pierre Auger Observatory, has been designed to study these energetic cosmic particles, and answer the crucial questions of ultra high energy cosmic ray physics. The Southern Observatory in Argentina has been collecting data since January 2004, and its exposure is larger than that of any other cosmic ray experiment. Among the first results from the Pierre Auger Collaboration are the most precise measurement of the suppression of the cosmic ray flux at the highest energies, the first anisotropy result above 6 × 1019 eV, the first photon limit with a fluorescence detector, and the best neutrino limit at EeV energies.
After a few years of operation, we found strong indications that ultra high energy cosmic rays come from nearby, extragalactic sources, opening a window for charged particle astronomy. In this talk, I will describe our most recent results on anisotropy and composition, and discuss their exciting astrophysical implications.
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