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. Gonzalez; J. A. Goodman; C. M. Hoffman; P. H. Hüntemeyer; B. E. Kolterman; C. P. Lansdell; J. T. Linnemann; J. E. McEnery; A. I. Mincer; P. Nemethy; D. Noyes; J. Pretz; J. M. Ryan; P. M.Saz Parkinson; A. Shoup; G. Sinnis; A. J. Smith; G. W. Sullivan; V. Vasileiou; G. P. Walker; D. A. Williams; G. B. Yodh

doi:10.1103/PhysRevLett.101.221101

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. Gonzalez
, J. A. Goodman
, C. M. Hoffman
, P. H. Hüntemeyer
, B. E. Kolterman
, C. P. Lansdell
, J. T. Linnemann
, J. E. McEnery
, A. I. Mincer

P. Nemethy, D. Noyes, J. Pretz, J. M. Ryan, P. M.Saz Parkinson, A. Shoup, G. Sinnis, A. J. Smith, G. W. Sullivan, V. Vasileiou, G. P. Walker, D. A. Williams, G. B. Yodh

Physics

Research output: Contribution to journal › Article › peer-review

221 Scopus citations

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.

Original language	English (US)
Article number	221101
Journal	Physical review letters
Volume	101
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevLett.101.221101
State	Published - Nov 24 2008

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.101.221101

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Abdo, A. A., Allen, B., Aune, T., Berley, D., Blaufuss, E., Casanova, S., Chen, C., Dingus, B. L., Ellsworth, R. W., Fleysher, L., Fleysher, R., Gonzalez, M. M., Goodman, J. A., Hoffman, C. M., Hüntemeyer, P. H., Kolterman, B. E., Lansdell, C. P., Linnemann, J. T., McEnery, J. E., ... Yodh, G. B. (2008). Discovery of localized regions of excess 10-TeV cosmic rays. Physical review letters, 101(22), Article 221101. https://doi.org/10.1103/PhysRevLett.101.221101

@article{195b26834a6b44748d69167d3e771c66,

title = "Discovery of localized regions of excess 10-TeV cosmic rays",

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.",

author = "Abdo, \{A. A.\} and B. Allen and T. Aune and D. Berley and E. Blaufuss and S. Casanova and C. Chen and Dingus, \{B. L.\} and Ellsworth, \{R. W.\} and L. Fleysher and R. Fleysher and Gonzalez, \{M. M.\} and Goodman, \{J. A.\} and Hoffman, \{C. M.\} and H{\"u}ntemeyer, \{P. H.\} and Kolterman, \{B. E.\} and Lansdell, \{C. P.\} and Linnemann, \{J. T.\} and McEnery, \{J. E.\} and Mincer, \{A. I.\} and P. Nemethy and D. Noyes and J. Pretz and Ryan, \{J. M.\} and Parkinson, \{P. M.Saz\} and A. Shoup and G. Sinnis and Smith, \{A. J.\} and Sullivan, \{G. W.\} and V. Vasileiou and Walker, \{G. P.\} and Williams, \{D. A.\} and Yodh, \{G. B.\}",

year = "2008",

month = nov,

day = "24",

doi = "10.1103/PhysRevLett.101.221101",

language = "English (US)",

volume = "101",

journal = "Physical review letters",

issn = "0031-9007",

publisher = "American Physical Society",

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Abdo, AA, Allen, B, Aune, T, Berley, D, Blaufuss, E, Casanova, S, Chen, C, Dingus, BL, Ellsworth, RW, Fleysher, L, Fleysher, R, Gonzalez, MM, Goodman, JA, Hoffman, CM, Hüntemeyer, PH, Kolterman, BE, Lansdell, CP, Linnemann, JT, McEnery, JE, Mincer, AI, Nemethy, P, Noyes, D, Pretz, J, Ryan, JM, Parkinson, PMS, Shoup, A, Sinnis, G, Smith, AJ, Sullivan, GW, Vasileiou, V, Walker, GP, Williams, DA & Yodh, GB 2008, 'Discovery of localized regions of excess 10-TeV cosmic rays', Physical review letters, vol. 101, no. 22, 221101. https://doi.org/10.1103/PhysRevLett.101.221101

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 - 2008/11/24

Y1 - 2008/11/24

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 - https://www.scopus.com/pages/publications/56849088729

UR - https://www.scopus.com/pages/publications/56849088729#tab=citedBy

U2 - 10.1103/PhysRevLett.101.221101

DO - 10.1103/PhysRevLett.101.221101

M3 - Article

AN - SCOPUS:56849088729

SN - 0031-9007

VL - 101

JO - Physical review letters

JF - Physical review letters

IS - 22

M1 - 221101

ER -

Discovery of localized regions of excess 10-TeV cosmic rays

Abstract

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