Early SPI/INTEGRAL measurements of galactic 511 keV line emission from positron annihilation

Details Early SPI/INTEGRAL measurements of galactic 511 keV line emission from positron annihilation Early SPI/INTEGRAL measurements of galactic 511 keV line emission from positron annihilation

2003-09-17

arxiv.org/abs/astro-ph/0309484v1

Astron.Astrophys.407:L55,2003

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures

Scientific paper

10.1051/0004-6361:20031056

We report the first measurements of the 511 keV line emission from the Galactic Centre (GC) region performed with the spectrometer SPI on the space observatory INTEGRAL (International Gamma-Ray Astrophysics Laboratory). Taking into account the range of spatial distribution models which are consistent with the data, we derive a flux of $9.9^{+4.7}_{-2.1} \times 10^{-4}$ ph cm$^{-2}$ s$^{-1}$ and an intrinsic line width of $2.95^{+0.45}_{-0.51}$ keV (FWHM). The results are consistent with other high-spectroscopy measurements, though the width is found to be at the upper bound of previously reported values.

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