期刊
PHYSICAL REVIEW LETTERS
卷 101, 期 22, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.221101
关键词
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资金
- National Science Foundation [PHY-0245234, -0302000, -0400424, -0504201, -0601080, ATM-0002744]
- U. S. Department of Energy
- Los Alamos National Laboratory
- University of California
- Institute of Geophysics and Planetary Physics
- Direct For Mathematical & Physical Scien
- Division Of Physics [757759] Funding Source: National Science Foundation
The 7 year data set of the Milagro TeV observatory contains 2.2x10(11) events of which most are due to hadronic cosmic rays. These data are searched for evidence of intermediate scale structure. Excess emission on angular scales of similar to 10 degrees has been found in two localized regions of unknown origin with greater than 12 sigma significance. Both regions are inconsistent with pure 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 similar to 10 TeV. Potential causes of these excesses are explored, but no compelling explanations are found.
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