SAS-2 observations of gamma-rays from the galactic plane

Preliminary data are given for the SAS-2 high-energy (>100 MeV) galactic gamma-ray observations. These data include both latitude and longitude distributions. The longitude distribution shows a high-density region for 3300<lsup(II)<400. The latitude distributions toward the centre and the anticentre are markedly different, the former showing a two-component structure of half-widths of about 30 and 60 respectively. The energy spectrum in the range 35-200 MeV is hard, consistent with cosmic-ray interactions with interstellar matter, including π0 decay and emission from energetic electron interactions. The data is consistent with an interpretation in terms of the confinement of the cosmic rays in the spiral arms