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; R. Fleysher; I. Gebauer; M. M. Gonzalez; J. A. Goodman; E. Hays; C. M. Huffman; B. E. Kolterman; L. A. Kelley; C. P. Lansdell; J. 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

doi:10.1086/513696

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, R. 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

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237 Scopus citations

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 language	English (US)
Pages (from-to)	L33-L36
Journal	Astrophysical Journal
Volume	658
Issue number	1 II
DOIs	https://doi.org/10.1086/513696
State	Published - Mar 20 2007
Externally published	Yes

Keywords

Acceleration of particles
Cosmic rays
Gamma rays: observations

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/513696

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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, R., Gebauer, I., Gonzalez, M. M., Goodman, J. A., Hays, E., Huffman, C. M., Kolterman, B. E., Kelley, L. A., ... Yodh, G. B. (2007). Discovery of TeV gamma-ray emission from the cygnus region of the galaxy. Astrophysical Journal, 658(1 II), L33-L36. https://doi.org/10.1086/513696

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, pp. L33-L36. https://doi.org/10.1086/513696

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title = "Discovery of TeV gamma-ray emission from the cygnus region of the galaxy",

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.",

keywords = "Acceleration of particles, Cosmic rays, Gamma rays: observations",

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

year = "2007",

month = mar,

day = "20",

doi = "10.1086/513696",

language = "English (US)",

volume = "658",

pages = "L33--L36",

journal = "Astrophysical Journal",

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TY - JOUR

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, R.

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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U2 - 10.1086/513696

DO - 10.1086/513696

M3 - Article

AN - SCOPUS:34047234914

SN - 0004-637X

VL - 658

SP - L33-L36

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 II

ER -

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

Abstract

Keywords

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