INTEGRAL/IBIS search for e-e+ annihilation radiation from the Galactic Center Region

Details INTEGRAL/IBIS search for e-e+ annihilation radiation from the Galactic Center Region INTEGRAL/IBIS search for e-e+ annihilation radiation from the Galactic Center Region

2005-01-07

arxiv.org/abs/astro-ph/0501123v1

Astronomy and Astrophysics

Astrophysics

6 pages, 3 figures; Cospar 2004. To be published in: Advances in Space Research

Scientific paper

10.1016/j.asr.2005.01.015

Electron-positron annihilation radiation from the Galactic Center region has been detected since the seventies, but its astrophysical origin is still a topic of a scientific debate. We have analyzed data of the gamma-ray imager IBIS/ISGRI onboard of ESA's INTEGRAL platform in the e$^{-}$e$^{+}$ line. During the first year of the missions Galactic Center Deep Exposure no evidence for point sources at 511 keV has been found in the ISGRI data; the $2 \sigma$ upper limit for resolved single point sources is estimated to be $1.6\times 10^{-4} ph cm^{-2} s^{-1}$.

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