We provide first constraints on the morphology of the 511 keV line emission from the galactic centre region on basis of data taken with the spectrometer SPI on the INTEGRAL gamma-ray observatory. The data suggest an azimuthally symmetric galactic bulge component with FWHM of ~ with a uncertainty range covering . The 511 keV line flux in the bulge component amounts to ph cm-2 s-1. No evidence for a galactic disk component has been found so far; upper flux limits in the range ph cm-2 s-1 have been obtained that depend on the assumed disk morphology. These limits correspond to lower limits on the bulge-to-disk ratio of .
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Knödlseder et al. (2003) studied this question.
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