A measurement of the spatial distribution of diffuse TeV gamma-ray emission from the galactic plane with Milagro

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; I. V. Moskalenko; P. Nemethy; D. Noyes; T. A. Porter; J. Pretz; J. M. Ryan; P. M.Saz Parkinson; A. Shoup; G. Sinnis; A. J. Smith; A. W. Strong; G. W. Sullivan; V. Vasileiou; G. P. Walker; D. A. Williams; G. B. Yodh

doi:10.1086/592213

A measurement of the spatial distribution of diffuse TeV gamma-ray emission from the galactic plane with Milagro

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

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Abstract

Diffuse γ-ray emission produced by the interaction of cosmic-ray particles with matter and radiation in the Galaxy can be used to probe the distribution of cosmic rays and their sources in different regions of the Galaxy. With its large field of view and long observation time, the Milagro Gamma Ray Observatory is an ideal instrument for surveying large regions of the northern hemisphere sky and for detecting diffuse 7-ray emission at very high energies. Here the spatial distribution and the flux of the diffuse γ-ray emission in the TeVenergy range with a median energy of 15 TeV for Galactic longitude between 30° and 110° and between 136° and 216° and for Galactic latitude between -10° and 10° are determined. The measured fluxes are consistent with predictions of the GALPROP model everywhere, except for the Cygnus region (l €[65°, 85°]). For the Cygnus region, the flux is twice the predicted value. This excess can be explained by the presence of active cosmic-ray sources accelerating hadrons, which interact with the local dense interstellar medium and produce gamma rays through pion decay.

Original language	English (US)
Pages (from-to)	1078-1083
Number of pages	6
Journal	Astrophysical Journal
Volume	688
Issue number	2
DOIs	https://doi.org/10.1086/592213
State	Published - Dec 1 2008

Keywords

Gamma rays: observations

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/592213

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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). A measurement of the spatial distribution of diffuse TeV gamma-ray emission from the galactic plane with Milagro. Astrophysical Journal, 688(2), 1078-1083. https://doi.org/10.1086/592213

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, Moskalenko, IV, Nemethy, P, Noyes, D, Porter, TA, Pretz, J, Ryan, JM, Parkinson, PMS, Shoup, A, Sinnis, G, Smith, AJ, Strong, AW, Sullivan, GW, Vasileiou, V, Walker, GP, Williams, DA & Yodh, GB 2008, 'A measurement of the spatial distribution of diffuse TeV gamma-ray emission from the galactic plane with Milagro', Astrophysical Journal, vol. 688, no. 2, pp. 1078-1083. https://doi.org/10.1086/592213

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title = "A measurement of the spatial distribution of diffuse TeV gamma-ray emission from the galactic plane with Milagro",

abstract = "Diffuse γ-ray emission produced by the interaction of cosmic-ray particles with matter and radiation in the Galaxy can be used to probe the distribution of cosmic rays and their sources in different regions of the Galaxy. With its large field of view and long observation time, the Milagro Gamma Ray Observatory is an ideal instrument for surveying large regions of the northern hemisphere sky and for detecting diffuse 7-ray emission at very high energies. Here the spatial distribution and the flux of the diffuse γ-ray emission in the TeVenergy range with a median energy of 15 TeV for Galactic longitude between 30° and 110° and between 136° and 216° and for Galactic latitude between -10° and 10° are determined. The measured fluxes are consistent with predictions of the GALPROP model everywhere, except for the Cygnus region (l €[65°, 85°]). For the Cygnus region, the flux is twice the predicted value. This excess can be explained by the presence of active cosmic-ray sources accelerating hadrons, which interact with the local dense interstellar medium and produce gamma rays through pion decay.",

keywords = "Gamma rays: observations",

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 Moskalenko, {I. V.} and P. Nemethy and D. Noyes and Porter, {T. A.} and J. Pretz and Ryan, {J. M.} and Parkinson, {P. M.Saz} 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 Yodh, {G. B.}",

year = "2008",

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doi = "10.1086/592213",

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T1 - A measurement of the spatial distribution of diffuse TeV gamma-ray emission from the galactic plane with Milagro

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 - Moskalenko, I. V.

AU - Nemethy, P.

AU - Noyes, D.

AU - Porter, T. A.

AU - Pretz, J.

AU - Ryan, J. M.

AU - Parkinson, P. M.Saz

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 - Yodh, G. B.

PY - 2008/12/1

Y1 - 2008/12/1

N2 - Diffuse γ-ray emission produced by the interaction of cosmic-ray particles with matter and radiation in the Galaxy can be used to probe the distribution of cosmic rays and their sources in different regions of the Galaxy. With its large field of view and long observation time, the Milagro Gamma Ray Observatory is an ideal instrument for surveying large regions of the northern hemisphere sky and for detecting diffuse 7-ray emission at very high energies. Here the spatial distribution and the flux of the diffuse γ-ray emission in the TeVenergy range with a median energy of 15 TeV for Galactic longitude between 30° and 110° and between 136° and 216° and for Galactic latitude between -10° and 10° are determined. The measured fluxes are consistent with predictions of the GALPROP model everywhere, except for the Cygnus region (l €[65°, 85°]). For the Cygnus region, the flux is twice the predicted value. This excess can be explained by the presence of active cosmic-ray sources accelerating hadrons, which interact with the local dense interstellar medium and produce gamma rays through pion decay.

AB - Diffuse γ-ray emission produced by the interaction of cosmic-ray particles with matter and radiation in the Galaxy can be used to probe the distribution of cosmic rays and their sources in different regions of the Galaxy. With its large field of view and long observation time, the Milagro Gamma Ray Observatory is an ideal instrument for surveying large regions of the northern hemisphere sky and for detecting diffuse 7-ray emission at very high energies. Here the spatial distribution and the flux of the diffuse γ-ray emission in the TeVenergy range with a median energy of 15 TeV for Galactic longitude between 30° and 110° and between 136° and 216° and for Galactic latitude between -10° and 10° are determined. The measured fluxes are consistent with predictions of the GALPROP model everywhere, except for the Cygnus region (l €[65°, 85°]). For the Cygnus region, the flux is twice the predicted value. This excess can be explained by the presence of active cosmic-ray sources accelerating hadrons, which interact with the local dense interstellar medium and produce gamma rays through pion decay.

KW - Gamma rays: observations

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DO - 10.1086/592213

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SN - 0004-637X

VL - 688

SP - 1078

EP - 1083

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

ER -

A measurement of the spatial distribution of diffuse TeV gamma-ray emission from the galactic plane with Milagro

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