Abstract
An image of the anticenter region of the Galaxy between right ascension 50/sup 0/ and 110/sup 0/ and between declination +10/sup 0/ and +50/sup 0/ in the energy range 1.1--10 MeV is derived from data obtained during a balloon flight with the MPI Compton telescope. The telescope has a field of view of 40/sup 0/--50/sup 0/ (FWHM) and a 1 sigma angular resolution of about 4/sup 0/ within this field. A significantly enhanced ..gamma..-ray emission is observed along the galactic plane from l/sup II/ = 160/sup 0/ to l/sup II/ = 197/sup 0/. Part of the emission is due to the Crab Nebula. The energy spectrum of the pulsed and total Crab emission is determined. Because of the limited angular resolution of the telescope it is not possible to decide whether the remainder of the emission is diffuse in nature or due to unresolved sources. No significantly enhanced ..gamma..-ray emission is observed from the direction of the high-energy ..gamma..-ray source Geminga (2CG 195+04) or from the Seyfert galaxy MCG 8--11--11, which recently was reported to be a soft ..gamma..-ray source. An upper limit to the diffuse galactic ..gamma..-ray emission is determined, which leads to restrictions of the spectrum of interstellarmore » cosmic ray electrons at MeV energies.« less
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