The First Year of INTEGRAL/SPI: Status of 511 keV Positron Annihilation Line Observations

Details The First Year of INTEGRAL/SPI: Status of 511 keV Positron Annihilation Line Observations The First Year of INTEGRAL/SPI: Status of 511 keV Positron Annihilation Line Observations

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sf2a.conf..415w&link_type=abstract

SF2A-2004: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 14-18, 2004. Edited by F. Combes, D. Barret

Astronomy and Astrophysics

Astrophysics

Scientific paper

The INTEGRAL observatory, launched in October 2002, carries as one of its two main instruments the high resolution Ge spectrometer SPI . A coded mask allows SPI to image the sky with an angular resolution of about 3 degrees. We summarize the status of SPI observations of 511 keV positron annihilation line radiation from the Galactic center region after the first year of the INTEGRAL mission. The spatial distribution is dominated by emission from the bulge of the Galaxy; this bulge emission is well described by a Gaussian with a FWHM of about 8 degrees. The 511 keV line flux from the bulge is about 10-3 ph/cm2/s, the intrinsic width of the line is 2.7 keV (FWHM). We discuss the implications of these results for the origin of positrons in our Galaxy.

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