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B. Teegarden (NASA/GSFC), E. Cisana (CESR), B. Cordier (CEA), R. Diehl (MPE), M. Harris, P. Jean, V. Lonjou, J. Knödlseder (CESR), K. Kretschmer, G. Lichti (MPE), J. P. Roques (CESR), S. Schanne (CEA), V. Schönfelder (MPE), G. K. Skinner (CESR), A. Strong (MPE), M. Valsesia, P. von Ballmoos (CESR), A. von Kienlin (MPE), G. Weidenspointner (CESR)
The Spectrometer (SPI) on the ESA INTEGRAL mission is a cooled-germanium coded-aperture telescope designed to perform high-resolution gamma-ray spectroscopy in the 20-8000 keV range. The search for and study of gamma-ray line emission was one of the principal scientific justifications for the INTEGRAL mission. The INTEGRAL Core Program includes a deep exposure of the central radian of our Galaxy, a known source of gamma-ray line emission. In addition a large fraction (typically ~50 Program observations are within or close to the Galactic Plane. This observing program combined with the broad (~ 25 deg) field-of-view of the Spectrometer will produce an unprecedented depth of coverage for the study of Galactic gamma-ray lines. In this paper we will present a broad overview of the first 1 1/2 yr of observations including results and limits from electron-positron annihilation and from the decay of 26Al, 44Ti, 60Fe and 22Na. More detailed expositions of the electron-positron annihilation and 60Fe line observations will be given in companion talks by Weidenspointner et al. and Harris et al.
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Bulletin of the American Astronomical Society, 36 #3
© 2004. The American Astronomical Soceity.