Abstract
Recent data from SAS-2 on the galactic -ray line flux as a function of longitude reveal a broad maximum in the region <= 300. These data, as unfolded here, imply that the low-energy (1-10 GeV) galactic cosmic-ray flux varies with the radial distance, , from the galactic center and is about an order of magnitude higher than the local value in a toroidal region for between 4 and 5 kpc. We further show that this enhancement can be plausibly accounted for by Fermi acceleration and compression caused by a hydrodynamic shock driven by the expanding gas in the "3-kpc" arm and invoked in some versions of galactic structure theory. Subject headings: cosmic rays - galactic structure - gamma rays
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