HEAO 3 limits on the 44Ti yield in type I supernovae

Details HEAO 3 limits on the 44Ti yield in type I supernovae HEAO 3 limits on the 44Ti yield in type I supernovae

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aipc..232..291m&link_type=abstract

Gamma-ray line astrophysics. AIP Conference Proceedings, Volume 232, pp. 291-296 (1991).

Astronomy and Astrophysics

Astrophysics

3

Supernovae, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages, Gamma-Ray Sources, Gamma-Ray Bursts

Scientific paper

Data from the high-resolution gamma-ray spectroscopy experiment on HEAO 3 have been searched for line emission from the decay of 44Ti created in recent galactic supernova explosions. Because the 78-year mean life of 44Ti is comparable to the average time between galactic supernovae, the gamma-ray line emission from its decay should appear as a galactic point source. No evidence was found for such emission from a point source anywhere in the galactic plane, with a 1 σ limit of 8.3×10-5 photons cm-2 s-1. A detailed model was developed to simulate the galactic gamma-ray emission from the decay of 44Ti produced in type I supernovae. This model was used with the measured gamma-ray line limits to constrain the supernova yields and recurrence periods. For example, if the supernovae recurrence period is 36 years, the average 44Ti yield per event must be <4×10-4 Msolar at the 90% level of confidence.

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