arxiv: 0801.3827 · v3 · submitted 2008-01-24 · 🌌 astro-ph

Discovery of Localized Regions of Excess 10-TeV Cosmic Rays

A. A. Abdo , B. Allen , T. Aune , D. Berley , E. Blaufuss , S. Casanova , C. Chen , B. L. Dingus

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R. W. Ellsworth L. Fleysher R. Fleysher M. M. Gonzales J. A. Goodman C. M. Hoffman P. H. H\"untemeyer B. E. Kolterman C. P. Lansdell J. T. Linnemann J. E. McEnery A. I. Mincer P. Nemethy D. Noyes J. Pretz J. M. Ryan P. M. Saz Parkinson A. Shoup G. Sinnis A. J. Smith G. W. Sullivan V. Vasileiou G. P. Walker D. A. Williams G. B. Yodh

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keywords regionsexcessfoundlocalizedsigmaspectrumanalysisangular

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An analysis of 7 years of Milagro data performed on a 10-degree angular scale has found two localized regions of excess of unknown origin with greater than 12 sigma significance. Both regions are inconsistent with gamma-ray emission with high confidence. One of the regions has a different energy spectrum than the isotropic cosmic-ray flux at a level of 4.6 sigma, and it is consistent with hard spectrum protons with an exponential cutoff, with the most significant excess at ~10 TeV. Potential causes of these excesses are explored, but no compelling explanations are found.

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Discovery of Localized Regions of Excess 10-TeV Cosmic Rays

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