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Study of the diffuse gamma-ray emission from the Galactic plane with ARGO-YBJ

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arxiv 1507.06758 v1 pith:AQY3ZWFW submitted 2015-07-24 astro-ph.IM astro-ph.HEhep-ph

B. Bartoli , P. Bernardini , X.J. Bi , P. Branchini , A. Budano , P. Camarri , Z. Cao , R. Cardarelli
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S. Catalanotti S.Z. Chen T.L. Chen P. Creti S.W. Cui B.Z. Dai A. D'Amone Danzengluobu I. De Mitri B. D'Ettorre Piazzoli T. Di Girolamo G. Di Sciascio C.F. Feng Zhaoyang Feng Zhenyong Feng Q.B. Gou Y.Q. Guo H.H. He Haibing Hu Hongbo Hu M. Iacovacci R. Iuppa H.Y. Jia Labaciren H.J. Li G. Liguori C. Liu J. Liu M.Y. Liu H. Lu L.L. Ma X.H. Ma G. Mancarella S.M. Mari G. Marsella D. Martello S. Mastroianni P. Montini C.C. Ning M. Panareo L. Perrone P. Pistilli F. Ruggieri P. Salvini R. Santonico P.R. Shen X.D. Sheng F. Shi A. Surdo Y.H. Tan P. Vallania S. Vernetto C. Vigorito H. Wang C.Y. Wu H.R. Wu L. Xue Q.Y. Yang X.C. Yang Z.G. Yao A.F. Yuan M. Zha H.M. Zhang L. Zhang X.Y. Zhang Y. Zhang J. Zhao Zhaxiciren Zhaxisangzhu X.X. Zhou F.R. Zhu Q.Q. Zhu G. Zizzi
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classification astro-ph.IMastro-ph.HEhep-ph
keywords galacticargo-ybjdiffuseemissiongamma-raybeenexcessmilagro
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The events recorded by ARGO-YBJ in more than five years of data collection have been analyzed to determine the diffuse gamma-ray emission in the Galactic plane at Galactic longitudes 25{\deg} < l < 100{\deg} and Galactic latitudes . The energy range covered by this analysis, from ~350 GeV to ~2 TeV, allows the connection of the region explored by Fermi with the multi-TeV measurements carried out by Milagro. Our analysis has been focused on two selected regions of the Galactic plane, i.e., 40{\deg} < l < 100{\deg} and 65{\deg} < l < 85{\deg} (the Cygnus region), where Milagro observed an excess with respect to the predictions of current models. Great care has been taken in order to mask the most intense gamma-ray sources, including the TeV counterpart of the Cygnus cocoon recently identified by ARGO-YBJ, and to remove residual contributions. The ARGO-YBJ results do not show any excess at sub-TeV energies corresponding to the excess found by Milagro, and are consistent with the predictions of the Fermi model for the diffuse Galactic emission. From the measured energy distribution we derive spectral indices and the differential flux at 1 TeV of the diffuse gamma-ray emission in the sky regions investigated.

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Cited by 5 Pith papers

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