Early SPI / INTEGRAL contraints on the morphology of the 511 keV line emission in the 4th galactic quadrant
Sep, 20035 pages
Published in:
- Astron.Astrophys. 411 (2003) L457-L460
e-Print:
- astro-ph/0309442 [astro-ph]
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Abstract: (arXiv)
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 ~9 deg with a 2 sigma uncertainty range covering 6-18 deg. The 511 keV line flux in the bulge component amounts to (9.9+4.7-2.1) 10e-4 ph cm-2 s-1. No evidence for a galactic disk component has been found so far/ upper 2 sigma flux limits in the range (1.4-3.4) 10e-3 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 0.3-0.6.References(13)
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