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We present a study on the gamma-ray emission detected by the AGILE-GRID fromthe region of the SNR G78.2+2.1 (Gamma Cygni). In order to investigate thepossible presence of gamma rays associated with the SNR below 1 GeV, it isnecessary to analyze the gamma-ray radiation underlying the strong emissionfrom the pulsar PSR J2021+4026, which totally dominates the field. An"off-pulse" analysis has been carried out, by considering only the emissionrelated to the pulsar off-pulse phase of the AGILE-GRID light curve. We foundthat the resulting off-pulsed emission in the region of the SNR - detected bythe AGILE-GRID above 400 MeV - partially overlaps the radio shell boundary. Byanalyzing the averaged emission on the whole angular extent of the SNR, wefound that a lepton-dominated double population scenario can account for theradio and gamma-ray emission from the source. In particular, the MeV-GeVaveraged emission can be explained mostly by Bremsstrahlung processes in a highdensity medium, whereas the GeV-TeV radiation by both Bremsstrahlung (E < 250GeV) and inverse Compton processes (E > 250 GeV) in a lower density medium.

AGILE study of the gamma-ray emission from the SNR G78.2+2.1 (Gamma Cygni)