Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2010-01-25
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
6 pages, 2 figures. Accepted for publication on PoS, proceedings of "The Extreme sky: Sampling the Universe above 10 keV", hel
Scientific paper
The IBIS imager on board the INTEGRAL satellite, thanks to the large field of view and good sensitivity, gave us a unique opportunity to search for possible 511 keV point sources either previously unknown or associated to known objects such as X-ray binaries or supernovae. The IBIS sensitivity at 511 keV depends on the gamma ray detector quantum efficiency at this energy and on the background. Both these quantities have been estimated. Reducing all the available IBIS data up to April 2008 we have produced a 5 years full sky 511 keV map with 10 Ms exposure in the Galactic Center. We did not find any significant signal at this energy. The lack of detection of 511 keV galactic point sources is in agreement with the idea that a significant part of the galactic positrons originates in compact objects and then propagates in the interstellar medium.
Bazzano Angela
de Cesare Giovanni
Ubertini Pietro
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