Details
| Original language | English |
|---|---|
| Article number | 221101 |
| Number of pages | 5 |
| Journal | Physical review letters |
| Volume | 101 |
| Issue number | 22 |
| Early online date | 24 Nov 2008 |
| Publication status | Published - 28 Nov 2008 |
| Externally published | Yes |
Abstract
The 7 year data set of the Milagro TeV observatory contains 2.2×1011 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 ∼10° has been found in two localized regions of unknown origin with greater than 12σ 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 4.6σ, and it is consistent with hard spectrum protons with an exponential cutoff, with the most significant excess at ∼10TeV. Potential causes of these excesses are explored, but no compelling explanations are found.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- General Physics and Astronomy
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In: Physical review letters, Vol. 101, No. 22, 221101, 28.11.2008.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Discovery of Localized Regions of Excess 10-TeV Cosmic Rays
AU - Abdo, A. A.
AU - Allen, B.
AU - Aune, T.
AU - Berley, D.
AU - Blaufuss, E.
AU - Casanova, S.
AU - Chen, C.
AU - Dingus, B. L.
AU - Ellsworth, R. W.
AU - Fleysher, L.
AU - Fleysher, R.
AU - Gonzalez, M. M.
AU - Goodman, J. A.
AU - Hoffman, C. M.
AU - Hüntemeyer, P. H.
AU - Kolterman, B. E.
AU - Lansdell, C. P.
AU - Linnemann, J. T.
AU - McEnery, J. E.
AU - Mincer, A. I.
AU - Nemethy, P.
AU - Noyes, D.
AU - Pretz, J.
AU - Ryan, J. M.
AU - Parkinson, P. M.Saz
AU - Shoup, A.
AU - Sinnis, G.
AU - Smith, A. J.
AU - Sullivan, G. W.
AU - Vasileiou, V.
AU - Walker, G. P.
AU - Williams, D. A.
AU - Yodh, G. B.
PY - 2008/11/28
Y1 - 2008/11/28
N2 - The 7 year data set of the Milagro TeV observatory contains 2.2×1011 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 ∼10° has been found in two localized regions of unknown origin with greater than 12σ 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 4.6σ, and it is consistent with hard spectrum protons with an exponential cutoff, with the most significant excess at ∼10TeV. Potential causes of these excesses are explored, but no compelling explanations are found.
AB - The 7 year data set of the Milagro TeV observatory contains 2.2×1011 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 ∼10° has been found in two localized regions of unknown origin with greater than 12σ 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 4.6σ, and it is consistent with hard spectrum protons with an exponential cutoff, with the most significant excess at ∼10TeV. Potential causes of these excesses are explored, but no compelling explanations are found.
UR - http://www.scopus.com/inward/record.url?scp=56849088729&partnerID=8YFLogxK
U2 - 10.48550/arXiv.0801.3827
DO - 10.48550/arXiv.0801.3827
M3 - Article
AN - SCOPUS:56849088729
VL - 101
JO - Physical review letters
JF - Physical review letters
SN - 0031-9007
IS - 22
M1 - 221101
ER -