Milagro Observation of a Localized Excess of ˜10 TeV Cosmic Rays

Details Milagro Observation of a Localized Excess of ˜10 TeV Cosmic Rays Milagro Observation of a Localized Excess of ˜10 TeV Cosmic Rays

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aps..apr.t8003d&link_type=abstract

American Physical Society, 2008 APS April Meeting and HEDP/HEDLA Meeting, April 11-15, 2008, abstract #T8.003

Physics

Scientific paper

A analysis of Milagro data shows two regions in the Northern Sky of excess cosmic rays on an angular scale of ˜10^o with greater than 12σ significance. Diagnostics show that both regions are inconsistent with gamma-ray emission at a confidence level of >11σ. One of the regions has a different energy spectrum than the cosmic-ray background at a confidence level of 4.6σ, and it is consistent with a hard spectrum with an exponential cutoff, with the most significant excess at ˜10 TeV. This is difficult to explain since a 10 TeV proton in a 1 μG field has a gyroradius of 0.01 pc.

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