Abstract
The longitude distribution of gamma -ray intensity measured with the SAS-2 satellite has been unfolded to give the Calactic gamma -ray emissivity. It is found that the observations are consistent with either a cylindrically symmetric emissivity distribution, or a distribution uniform along spirals with tilt angles similar to those for spiral arms. The gamma -ray distribution in the Galaxy seems to be more in accord with models based on the molecular hydrogen distribution than those based on spiral structure.
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