Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-02-02
Astronomy and Astrophysics
Astrophysics
4 pages, 7 figures, 1 table. Accepted for publication in the proceedings of the 6th INTEGRAL Workshop on the Obscured Universe
Scientific paper
Recent observations of the 511 keV positron-electron annihilation line in the Galactic centre region by the INTEGRAL/SPI spectrometer have stirred up new speculations about the origin of the large corresponding positron injection rate. Beyond astrophysical candidates, new mechanisms have been put forward. We focus on the annihilation of light dark matter particles and review the various gamma-ray radiation components related to such a source of mono-energetic positrons in addition to the 511 keV line itself. We study the influence of the degree of ionisation of the bulge on this radiation, and its possible effects on the observational constraints on the mass of the hypothetical light dark matter particle or the injection energy of a mono-energetic source of positrons in general.
Cass'e Michel
Cordier Bertrand
Schanne Stephane
Sizun Patrick
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