Computer Science
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.552...81r&link_type=abstract
Proceedings of the 5th INTEGRAL Workshop on the INTEGRAL Universe (ESA SP-552). 16-20 February 2004, Munich, Germany. Scientific
Computer Science
12
Scientific paper
One of the main goals of the INTEGRAL satellite is the observation of potential nucleosynthesis sites in the Galaxy. Abundantly produced in supernovae, 44 Ti emits via its radioactive decay three γ-ray lines at 68, 78 and 1157 keV. With a half-life of about 60 years, this nucleus is probably the best indicator of young galactic supernovae. Most of them are thought to be hidden from our view at optical wavelengths due to strong extinction in the Galactic plane. Insensitive to this absorption, the 44 Ti γ-ray lines provide a powerful tool to search for and study these objects, as exemplified by the detection by COMPTEL of the 1.157 MeV 44 Ti line in Cas A and Vela Junior. Data from the first year of observation of the Galactic central regions with IBIS/ISGRI have been analyzed. From images formed around the two low energy 44 Ti lines, we report here the following results : first, no excess at a > 5σ confidence level has been found in the Galactic Centre Deep Exposure (GCDE), with a 3σ sensitivity of about 1.8 × 10-5 cm-2 s-1 . Second, there is no significant excess (> 3σ) at the position of the Kepler's supernova remnant. The upper limit obtained constrains the yield of 44 Ti ejected by this supernova as a function of its possible distance. These results confirm those obtained with the first six years of observation of COMPTEL with a sensitivity improved by about 30%. Key words: nucleosynthesis; gamma-ray observations; supernovae.
Ballet Jean
Decourchelle Anne
Lebrun François
Prantzos Nikos
Renaud Matthieu
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