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27 April 2024

» arxiv » astro-ph/0501123

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INTEGRAL/IBIS search for e-e+ annihilation radiation from the Galactic Center Region
G. De Cesare ; A. Bazzano ; F. Capitanio ; M. Del Santo ; V. Lonjou ; L. Natalucci ; P. Ubertini ; P. Von Ballmoos ;
Date:	7 Dec 2004
Subject:	astro-ph
Abstract:	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 $1.6 imes 10^{-4} ph cm^{-2} s^{-1}$.
Source:	arXiv, astro-ph/0501123
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