Early SPI/INTEGRAL contraints on the morphology of the 511 keV line emission in the 4th galactic quadrant

Details Early SPI/INTEGRAL contraints on the morphology of the 511 keV line emission in the 4th galactic quadrant Early SPI/INTEGRAL contraints on the morphology of the 511 keV line emission in the 4th galactic quadrant

2003-09-16

arxiv.org/abs/astro-ph/0309442v1

Astron.Astrophys.411:L457-L460,2003

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20031437

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.

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