COMPTEL observations of Ti-44 gamma-ray line emission from CAS A

Details COMPTEL observations of Ti-44 gamma-ray line emission from CAS A COMPTEL observations of Ti-44 gamma-ray line emission from CAS A

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...284l...1i&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 284, no. 1, p. L1-L4

Astronomy and Astrophysics

Astronomy

169

Gamma Ray Spectra, Line Spectra, Supernova Remnants, Titanium Isotopes, Background Radiation, Chronology, Gamma Ray Observatory, Spaceborne Astronomy

Scientific paper

The Compton Telescope (COMPTEL) telescope aboard the Compton Gamma-Ray Observatory (CGRO) is capable of imaging gamma-ray line sources in the MeV region with a sensitivity of the order 10-5 photons/(sq cm s). During two observations periods in July 1992 and February 1993 the Galactic plane in the region of the young supernova remnant Cas A was observed, showing evidence for line emission at 1.16 MeV from the decay of Ti-44 at a significance level of approximately 4 sigma. This is the first time a supernova remnant has been detected in the gamma-ray line from Ti-44 decay. Adopting a distance of 2.8 kpc to the Cas A remnant, the measured line flux (7.0 +/- 1.7) x 10-5 photons/(sq cm s), can be translated into a Ti-44 mass ejected during the Cas A supernova explosion, between (1.4 +/- 0.4) x 10-4 solar mass and (3.2 +/- 0.8) x 10-4 solar mass, depending on the precise value of the Ti-44 mean life time and on the precise date of the event. Implications of this result for supernova nucleosynthesis models are discussed.

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