Very High Energy Cosmic Rays:. Results from the Pierre Auger Observatory

Details Very High Energy Cosmic Rays:. Results from the Pierre Auger Observatory Very High Energy Cosmic Rays:. Results from the Pierre Auger Observatory

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009fuin.conf...36c&link_type=abstract

FUNDAMENTAL INTERACTIONS . Proceedings of the 23rd Lake Louise Winter Institute 2008 . Held 18 - 23 February 2008 in Lake Louise

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The Pierre Auger Observatory has recently reported new results that represent a major step forward in our understanding of the origins of the highest energy cosmic rays. The astrophysical origins of the highest energy cosmic rays have remained a persistent mystery for decades. Where in the universe do these particles come from? How do they obtain such enormous energies? Now, we seem to be on the verge of getting a new handle on these questions. The Pierre Auger Observatory, in Malargüe, Argentina, has been operating since 2004, and already we have some clues, including the energy spectrum and limits on photon flux and tau neutrino flux. Even more dramatic are results from anisotropy searches based on potential correlations between particular astrophysical objects and cosmic ray arrival directions. These results demonstrate that the arrival directions of the highest energy cosmic rays are not isotropic, and appear to be correlated with the distributions of relatively nearby active galaxies. These results strongly suggest that the sources of the highest energy events are extragalactic, although the statistics of the correlation do not allow us to identify unambiguously any specific class of objects as likely sources of cosmic rays. In this paper, we will summarize the recent results from Auger and what they imply for the origins of cosmic rays. We also describe plans for a new larger experiment in the northern hemisphere and the prospects for unambiguous identifications of individual astrophysical objects as sources.

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