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

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arxiv astro-ph/0309442 v1 pith:PPNZKACC submitted 2003-09-16 astro-ph

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

J. Knodlseder , V. Lonjou , P. Jean , M. Allain , P. Mandrou , J.-P. Roques , G.K. Skinner , G. Vedrenne
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P. von Ballmoos G. Weidenspointner P. Caraveo B. Cordier V. Schonfelder B.J. Teegarden
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keywords galacticcomponentlimitslinemorphologybeenbulgecm-2
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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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