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, 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
TL;DR
This paper reports the discovery of two localized regions of excess 10-TeV cosmic rays with high significance, which are inconsistent with gamma-ray emission and may indicate unknown astrophysical sources or phenomena.
Contribution
The study identifies two new localized excess regions of cosmic rays at 10 TeV, with detailed spectral analysis suggesting they are not gamma-ray sources, advancing understanding of cosmic-ray anisotropies.
Findings
Two regions of excess cosmic rays with >12 sigma significance.
One region has a hard spectrum consistent with proton origin.
No compelling astrophysical explanation found for the excesses.
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.
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