Discovery of Localized Regions of Excess 10-TeV Cosmic Ray

Abdo, A. A.; Allen, B. T.; Aune, T.; Berley, D.; Blaufuss, E.; Casanova, S.; Chen, C.; Dingus, B. L.; Ellsworth, R. W.; Gonzalez, M. M.; Goodman, J. A.; Prez, J.; Hoffman, C. M.; Hopper, B.; Hüntemeyer, P. H.; Kolterman, B. E.; Landsdell, C. P.; Linnemann, J. T.; McEnery, J. E.; Mincer, A. I.; Nemethy, P.; Noyes, D.; Ryan, J. M.; Saz-Parkinson, P. M.; Shoup, A.; Sinnis, G.; Smith, A. J.; Sullivan, G. W.; Vasileiou, V.; Walker, G. P.; Williams, D. A.; Xu, X. W.; Yodh, G. B.; Fleysher, L.; Fleysher, R.

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Discovery of Localized Regions of Excess 10-TeV Cosmic Ray

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Casanova, S.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Citation

Abdo, A. A., Allen, B. T., Aune, T., Berley, D., Blaufuss, E., Casanova, S., et al. (n.d.). Discovery of Localized Regions of Excess 10-TeV Cosmic Ray. Physical Review Letters.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-8672-E

Abstract

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.