Discovery of TeV gamma-ray emission from the cygnus region of the galaxy

A. A. Abdu, B. Allen, D. Berley, E. Blaufuss, S. Casanova, C. Chen, D. G. Coyne, R. S. Delay, B. L. Dingus, R. W. Ellsworth, L. Fleysher, Roman Fleysher, I. Gebauer, M. M. Gonzalez, J. A. Goodman, E. Hays, C. M. Huffman, B. E. Kolterman, L. A. Kelley, C. P. LansdellJ. T. Linnemann, J. E. Mcenery, A. I. Mincer, I. V. Moskalenko, P. Nemethy, D. Noyes, J. M. Ryan, F. W. Samuelson, P. M. Saz Parkinson, M. Schneider, A. Shoup, G. Sinnis, A. J. Smith, A. W. Strong, G. W. Sullivan, V. Vasileiou, G. P. Walker, D. A. Williams, X. W. Xu, G. B. Yodh

Research output: Contribution to journalArticle

196 Citations (Scopus)

Abstract

The diffuse gamma radiation arising from the interaction of cosmic-ray particles with matter and radiation in the Galaxy is one of the few probes available to study the origin of the cosmic rays. Data from the Milagro gamma-ray observatory - a water Cerenkov detector that continuously views ∼2 sr of the overhead sky - shows that the brightest extended region in the entire northern sky is the Cygnus region of the Galactic plane. The TeV image of the Cygnus region contains at least one new source, MGRO J2019+37, which is 10.9 σ above the isotropic background, as well as correlations with the matter density in the region. However, the gamma-ray flux from the Cygnus region (after excluding MGRO J2019+37) as measured at ∼12 TeV exceeds that predicted from a model of cosmic-ray production and propagation. This observation indicates the existence of either hard-spectrum cosmic-ray sources and/or unresolved sources of TeV gamma rays in the region.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume658
Issue number1 II
DOIs
StatePublished - Mar 20 2007
Externally publishedYes

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cosmic rays
gamma rays
galaxies
cosmic ray
northern sky
Gamma Ray Observatory
sky
propagation
probes
detectors
radiation
observatory
probe
water
interactions

Keywords

  • Acceleration of particles
  • Cosmic rays
  • Gamma rays: observations

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Abdu, A. A., Allen, B., Berley, D., Blaufuss, E., Casanova, S., Chen, C., ... Yodh, G. B. (2007). Discovery of TeV gamma-ray emission from the cygnus region of the galaxy. Astrophysical Journal, 658(1 II). https://doi.org/10.1086/513696

Discovery of TeV gamma-ray emission from the cygnus region of the galaxy. / Abdu, A. A.; Allen, B.; Berley, D.; Blaufuss, E.; Casanova, S.; Chen, C.; Coyne, D. G.; Delay, R. S.; Dingus, B. L.; Ellsworth, R. W.; Fleysher, L.; Fleysher, Roman; Gebauer, I.; Gonzalez, M. M.; Goodman, J. A.; Hays, E.; Huffman, C. M.; Kolterman, B. E.; Kelley, L. A.; Lansdell, C. P.; Linnemann, J. T.; Mcenery, J. E.; Mincer, A. I.; Moskalenko, I. V.; Nemethy, P.; Noyes, D.; Ryan, J. M.; Samuelson, F. W.; Saz Parkinson, P. M.; Schneider, M.; Shoup, A.; Sinnis, G.; Smith, A. J.; Strong, A. W.; Sullivan, G. W.; Vasileiou, V.; Walker, G. P.; Williams, D. A.; Xu, X. W.; Yodh, G. B.

In: Astrophysical Journal, Vol. 658, No. 1 II, 20.03.2007.

Research output: Contribution to journalArticle

Abdu, AA, Allen, B, Berley, D, Blaufuss, E, Casanova, S, Chen, C, Coyne, DG, Delay, RS, Dingus, BL, Ellsworth, RW, Fleysher, L, Fleysher, R, Gebauer, I, Gonzalez, MM, Goodman, JA, Hays, E, Huffman, CM, Kolterman, BE, Kelley, LA, Lansdell, CP, Linnemann, JT, Mcenery, JE, Mincer, AI, Moskalenko, IV, Nemethy, P, Noyes, D, Ryan, JM, Samuelson, FW, Saz Parkinson, PM, Schneider, M, Shoup, A, Sinnis, G, Smith, AJ, Strong, AW, Sullivan, GW, Vasileiou, V, Walker, GP, Williams, DA, Xu, XW & Yodh, GB 2007, 'Discovery of TeV gamma-ray emission from the cygnus region of the galaxy', Astrophysical Journal, vol. 658, no. 1 II. https://doi.org/10.1086/513696
Abdu AA, Allen B, Berley D, Blaufuss E, Casanova S, Chen C et al. Discovery of TeV gamma-ray emission from the cygnus region of the galaxy. Astrophysical Journal. 2007 Mar 20;658(1 II). https://doi.org/10.1086/513696
Abdu, A. A. ; Allen, B. ; Berley, D. ; Blaufuss, E. ; Casanova, S. ; Chen, C. ; Coyne, D. G. ; Delay, R. S. ; Dingus, B. L. ; Ellsworth, R. W. ; Fleysher, L. ; Fleysher, Roman ; Gebauer, I. ; Gonzalez, M. M. ; Goodman, J. A. ; Hays, E. ; Huffman, C. M. ; Kolterman, B. E. ; Kelley, L. A. ; Lansdell, C. P. ; Linnemann, J. T. ; Mcenery, J. E. ; Mincer, A. I. ; Moskalenko, I. V. ; Nemethy, P. ; Noyes, D. ; Ryan, J. M. ; Samuelson, F. W. ; Saz Parkinson, P. M. ; Schneider, M. ; Shoup, A. ; Sinnis, G. ; Smith, A. J. ; Strong, A. W. ; Sullivan, G. W. ; Vasileiou, V. ; Walker, G. P. ; Williams, D. A. ; Xu, X. W. ; Yodh, G. B. / Discovery of TeV gamma-ray emission from the cygnus region of the galaxy. In: Astrophysical Journal. 2007 ; Vol. 658, No. 1 II.
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abstract = "The diffuse gamma radiation arising from the interaction of cosmic-ray particles with matter and radiation in the Galaxy is one of the few probes available to study the origin of the cosmic rays. Data from the Milagro gamma-ray observatory - a water Cerenkov detector that continuously views ∼2 sr of the overhead sky - shows that the brightest extended region in the entire northern sky is the Cygnus region of the Galactic plane. The TeV image of the Cygnus region contains at least one new source, MGRO J2019+37, which is 10.9 σ above the isotropic background, as well as correlations with the matter density in the region. However, the gamma-ray flux from the Cygnus region (after excluding MGRO J2019+37) as measured at ∼12 TeV exceeds that predicted from a model of cosmic-ray production and propagation. This observation indicates the existence of either hard-spectrum cosmic-ray sources and/or unresolved sources of TeV gamma rays in the region.",
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T1 - Discovery of TeV gamma-ray emission from the cygnus region of the galaxy

AU - Abdu, A. A.

AU - Allen, B.

AU - Berley, D.

AU - Blaufuss, E.

AU - Casanova, S.

AU - Chen, C.

AU - Coyne, D. G.

AU - Delay, R. S.

AU - Dingus, B. L.

AU - Ellsworth, R. W.

AU - Fleysher, L.

AU - Fleysher, Roman

AU - Gebauer, I.

AU - Gonzalez, M. M.

AU - Goodman, J. A.

AU - Hays, E.

AU - Huffman, C. M.

AU - Kolterman, B. E.

AU - Kelley, L. A.

AU - Lansdell, C. P.

AU - Linnemann, J. T.

AU - Mcenery, J. E.

AU - Mincer, A. I.

AU - Moskalenko, I. V.

AU - Nemethy, P.

AU - Noyes, D.

AU - Ryan, J. M.

AU - Samuelson, F. W.

AU - Saz Parkinson, P. M.

AU - Schneider, M.

AU - Shoup, A.

AU - Sinnis, G.

AU - Smith, A. J.

AU - Strong, A. W.

AU - Sullivan, G. W.

AU - Vasileiou, V.

AU - Walker, G. P.

AU - Williams, D. A.

AU - Xu, X. W.

AU - Yodh, G. B.

PY - 2007/3/20

Y1 - 2007/3/20

N2 - The diffuse gamma radiation arising from the interaction of cosmic-ray particles with matter and radiation in the Galaxy is one of the few probes available to study the origin of the cosmic rays. Data from the Milagro gamma-ray observatory - a water Cerenkov detector that continuously views ∼2 sr of the overhead sky - shows that the brightest extended region in the entire northern sky is the Cygnus region of the Galactic plane. The TeV image of the Cygnus region contains at least one new source, MGRO J2019+37, which is 10.9 σ above the isotropic background, as well as correlations with the matter density in the region. However, the gamma-ray flux from the Cygnus region (after excluding MGRO J2019+37) as measured at ∼12 TeV exceeds that predicted from a model of cosmic-ray production and propagation. This observation indicates the existence of either hard-spectrum cosmic-ray sources and/or unresolved sources of TeV gamma rays in the region.

AB - The diffuse gamma radiation arising from the interaction of cosmic-ray particles with matter and radiation in the Galaxy is one of the few probes available to study the origin of the cosmic rays. Data from the Milagro gamma-ray observatory - a water Cerenkov detector that continuously views ∼2 sr of the overhead sky - shows that the brightest extended region in the entire northern sky is the Cygnus region of the Galactic plane. The TeV image of the Cygnus region contains at least one new source, MGRO J2019+37, which is 10.9 σ above the isotropic background, as well as correlations with the matter density in the region. However, the gamma-ray flux from the Cygnus region (after excluding MGRO J2019+37) as measured at ∼12 TeV exceeds that predicted from a model of cosmic-ray production and propagation. This observation indicates the existence of either hard-spectrum cosmic-ray sources and/or unresolved sources of TeV gamma rays in the region.

KW - Acceleration of particles

KW - Cosmic rays

KW - Gamma rays: observations

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