8th HEAD Meeting, 8-11 September, 2004
Session 16 Missions, Instruments and Data Analysis
Poster, Thursday, September 9, 2004, 9:00am-10:00pm

[Previous] | [Session 16] | [Next]

[16.25] Search for Unpredicted Gamma-ray Lines with INTEGRAL/SPI

K. Watanabe (UMD/NASA/GSFC), B. Teegarden (NASA/GSFC)

ESA's INTEGRAL mission was launched in October, 2002. The on-board Spectrometer SPI is the most sensitive high resolution gamma-ray spectrometer thus far flown in space.  We have undertaken a global search of the SPI data for unpredicted gamma-ray lines.  Photon counts in each detector are summed per pointing. We analyze the summed spectra with software we developed. We identify some lines due to isotopes with long half-life times, and radiation damage of the space craft. We realize that imperfect gain corrections cause some difficulties for this study in high energy (> ~ 4 MeV). We also point out that minor solar flares are sources of strong lines such as the 4.4 MeV Carbon line. We report preliminary upper limits on  temporally and spatially varying gamma-ray line fluxes.

[Previous] | [Session 16] | [Next]

Bulletin of the American Astronomical Society, 36 #3
© 2004. The American Astronomical Soceity.