Search for Unpredicted Gamma-ray Lines with INTEGRAL/SPI

Details Search for Unpredicted Gamma-ray Lines with INTEGRAL/SPI Search for Unpredicted Gamma-ray Lines with INTEGRAL/SPI

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004head....8.1625w&link_type=abstract

American Astronomical Society, HEAD meeting #8, #16.25; Bulletin of the American Astronomical Society, Vol. 36, p.933

Astronomy and Astrophysics

Astronomy

Scientific paper

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.

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