Study of the Diffuse Gamma-Ray Emission from the Galactic Plane with ARGO-YBJ
2015
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 planeat Galactic longitudes 25? < l < 100? 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? < l < 100? and 65? < l < 85? (the
Cygnusregion), where
Milagroobserved 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
cocoonrecently 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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