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Discovery of Localized Regions of Excess 10-TeV Cosmic Rays · Around

2008

Discovery of Localized Regions of Excess 10-TeV Cosmic Rays

Abdo, A. A., Allen, B., Aune, T. et al.

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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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Then

B. E. Kolterman et al., 30th ICRC, Merida, Mexico (2007)
2007
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A. A. Abdo et al., Astrophys. J. 658
2007
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M. Amenomori et al., in Turbulence and Nonlinear Processes in Astrophysical Plasmas (2007), vol. 932 of American Institute of Physics Conference Series , pp. 283–289
2007
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L. Drury and F. Aharonian, Astropart. Phys. 29
2008
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