Arcadian Functor

occasional meanderings in physics' brave new world

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Location: New Zealand

Marni D. Sheppeard

Sunday, June 01, 2008

Neutrino08 Day 6b

E. Roulet reported from the Pierre Auger Cosmic Ray Observatory in Argentina. This consists of 1600 detectors spread over 3000 $\textrm{km}^{2}$ along with 24 telescopes looking at the sky over the region. Pierre Auger recently confirmed the infamous GZK cutoff (more on this later) associated to proton energies greater than $6 \times 10^{19}$ eV. Rather, although high energy events were observed, the flux falls off by about a half with more than $6 \sigma$. High energy events are extragalactic. For 2006-2007 data, 8 strong correlations between events and nearby AGN were found, as compared to 3 expected. Centaurus A (the closest AGN) corresponds to 2 events located within 3 degrees. No candidates for diffuse neutrino flux were observed. Construction of Pierre Auger is almost completed.


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