A Measurement of the Spatial Distribution of Diffuse TeV Gamma-Ray Emission from the Galactic Plane with Milagro

doi:10.1086/592213

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A. A. Abdo et al. 2008 ApJ 688 1078 doi:10.1086/592213

A Measurement of the Spatial Distribution of Diffuse TeV Gamma-Ray Emission from the Galactic Plane with Milagro

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A. A. Abdo¹, B. Allen², T. Aune³, D. Berley⁴, E. Blaufuss⁴, S. Casanova⁵, C. Chen⁶, B. L. Dingus⁷, R. W. Ellsworth⁸, L. Fleysher⁹, R. Fleysher⁹, M. M. Gonzalez¹⁰, J. A. Goodman⁴, C. M. Hoffman⁷, P. H. Hüntemeyer⁷, B. E. Kolterman⁹, C. P. Lansdell¹¹, J. T. Linnemann¹², J. E. McEnery¹³, A. I. Mincer⁹, I. V. Moskalenko¹⁴, P. Nemethy⁹, D. Noyes⁴, T. A. Porter³, J. Pretz⁷, J. M. Ryan¹⁵, P. M. Saz Parkinson³, A. Shoup¹⁶, G. Sinnis⁷, A. J. Smith⁴, A. W. Strong¹⁷, G. W. Sullivan⁴, V. Vasileiou⁴, G. P. Walker⁷, D. A. Williams³ and G. B. Yodh⁶

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¹ Naval Research Laboratory, Washington, DC
² Harvard-Smithsonian Center for Astrophysics, Cambridge, MA
³ University of California, Santa Cruz, CA
⁴ University of Maryland, College Park, MD
⁵ Max-Planck-Institut für Kernphysik, Heidelberg, Germany
⁶ University of California, Irvine, CA
⁷ Los Alamos National Laboratory, Los Alamos, NM
⁸ George Mason University, Fairfax, VA
⁹ New York University, New York, NY
¹⁰ Instituto de Astronomía, Universidad Nacional Autónoma de México, D.F., México
¹¹ Institute for Defense Analyses, Alexandria, VA
¹² Michigan State University, East Lansing, MI
¹³ NASA Goddard Space Flight Center, Greenbelt, MD
¹⁴ HEPL and KIPAC, Stanford University, Stanford, CA
¹⁵ University of New Hampshire, Durham, NH
¹⁶ Ohio State University, Lima, OH
¹⁷ Max-Planck-Institut für extraterrestrische Physik, Garching, Germany

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Abstract References Cited By

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 γ-ray emission at very high energies. Here the spatial distribution and the flux of the diffuse γ-ray emission in the TeV energy 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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