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

    Research output: Contribution to journalArticle

    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 languageEnglish (US)
    Pages (from-to)1078-1083
    Number of pages6
    JournalAstrophysical Journal
    Volume688
    Issue number2
    DOIs
    StatePublished - Dec 1 2008

    Fingerprint

    cosmic rays
    rays
    spatial distribution
    gamma rays
    cosmic ray
    galaxies
    Gamma Ray Observatory
    Northern Hemisphere
    longitude
    hadrons
    field of view
    sky
    pions
    surveying
    energy
    observatory
    probes
    probe
    decay
    radiation

    Keywords

    • Gamma rays: observations

    ASJC Scopus subject areas

    • Space and Planetary Science
    • Astronomy and Astrophysics

    Cite this

    Abdo, A. A., Allen, B., Aune, T., Berley, D., Blaufuss, E., Casanova, S., ... 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

    A measurement of the spatial distribution of diffuse TeV gamma-ray emission from the galactic plane with Milagro. / 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.; Mincer, A. I.; Moskalenko, I. V.; Nemethy, P.; Noyes, D.; Porter, T. A.; Pretz, J.; Ryan, J. M.; Parkinson, P. M Saz; Shoup, A.; Sinnis, G.; Smith, A. J.; Strong, A. W.; Sullivan, G. W.; Vasileiou, V.; Walker, G. P.; Williams, D. A.; Yodh, G. B.

    In: Astrophysical Journal, Vol. 688, No. 2, 01.12.2008, p. 1078-1083.

    Research output: Contribution to journalArticle

    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
    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. ; Mincer, A. I. ; Moskalenko, I. V. ; Nemethy, P. ; Noyes, D. ; Porter, T. A. ; Pretz, J. ; Ryan, J. M. ; Parkinson, P. M Saz ; Shoup, A. ; Sinnis, G. ; Smith, A. J. ; Strong, A. W. ; Sullivan, G. W. ; Vasileiou, V. ; Walker, G. P. ; Williams, D. A. ; Yodh, G. B. / A measurement of the spatial distribution of diffuse TeV gamma-ray emission from the galactic plane with Milagro. In: Astrophysical Journal. 2008 ; Vol. 688, No. 2. pp. 1078-1083.
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    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.

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    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.

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