Abstract
Recent models of stellar nucleosynthesis suggest that massive stars are probably the main contributors of radioactive 26 Al in the Galaxy. In that case the angular distribution of the corresponding 1.8 MeV emission should trace, to some extent, the Galactic spiral arms, presumed site of massive star formation. Numerical simulations of the expected emissivity profile as a function of Galactic longitude are presented, taking into account plausible source distributions and a realistic spiral pattern for our Galaxy. The recently reported observations of the COMPTEL instrument aboard the Compton Observatory are discussed in light of those results
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