Galactic Positron Annihilation Radiation as observed with INTEGRAL/SPI

Details Galactic Positron Annihilation Radiation as observed with INTEGRAL/SPI Galactic Positron Annihilation Radiation as observed with INTEGRAL/SPI

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004head....8.2803w&link_type=abstract

American Astronomical Society, HEAD meeting #8, #28.03; Bulletin of the American Astronomical Society, Vol. 36, p.966

Astronomy and Astrophysics

Astrophysics

Scientific paper

The origin of the positrons whose annihilation gives rise to an appreciable flux of gamma rays from the central regions of our Galaxy is one of the mysteries of high energy astrophysics. SPI, one of the two main instruments on board the INTEGRAL observatory, is uniquely suited to study this positron annihilation radiation. It is a high resolution Ge spectrometer (FWHM 2.1 keV at 511 keV) which can image the sky at an angular resolution of about 3 degrees using a coded mask. Early in the mission, the 511 keV annihilation line has already been detected by SPI from the inner Galaxy. We summarize here 1.5 years of SPI observations of annihilation radiation, and discuss the implications of these results for the origin of positrons in the Galaxy.
G.W. acknowledges funding by ESA through an external fellowship.

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