Constraints on gamma-ray line and continuum emission from the Galactic Center Region at MeV Energies

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MPE Compton Telescope observations of MeV radiation from the direction of the Galactic Center lead to constraints on the central source and on diffuse processes in the Galaxy: The extent of 1.8 MeV line emission from 26Al suggests an 26Al production process with pronounced concentration towards the Galactic Center. The absence of other γ-ray lines constrains nucleosynthesis and cosmic ray excitation parameters in the Galaxy.
Upper limits on continuum γ-radiation can be interpreted as a central compact source in a low emission state in contrast to the 1979 observation with the HEAO-3 instrument. In addition, these upper limits constrain continuum γ-ray emission due to interactions of cosmic ray electrons below 100 MeV with Galactic interstellar matter.

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