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A UV image of M31
A UV(2000 A) picture of the Andromeda galaxy (M31) was obtained from aballoon-borne experiment. In addition to the central region of thegalaxy, the general spiral structure is seen as a ring which coincideswith the distribution of the OB associations and H II regions. Theelliptical companion NGC 205 is also barely detected. The fluxes of thisgalaxy NGC 205 and of NGC 206, a bright association in the spiralstructure of M31, are found compatible with their known stellar content.For the central part of M31, the flux is in agreement with previousdeterminations. Detailed analysis confirms the diffuse aspect of thiscentral region and reveals a well peaked luminosity distribution.Possible origins for the central UV radiation are also discussed.
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