The galactic supernova rate from COMPTEL [sup 44]Ti γ-line observations

The, L.-S.; Diehl, R.; Hartmann, D. H.; Iyudin, A. F.; Leising, M. D.; Oberlack, U.
April 2000
AIP Conference Proceedings;2000, Vol. 510 Issue 1, p64
Academic Journal
[sup 44]Ti is one of the few radioactive nuclei produced abundantly in supernovae (SNe). Because its life time is comparable to the typical time between supernovae in the Galaxy, γ-ray lines from [sup 44]Ti provide a powerful tool for the search for optically obscured supernovae that occurred during the last few 100 years. We present our analysis of COMPTEL data (Cycle 1–6), comparing γ-ray line images and flux distributions with Monte Carlo simulations of SNe in the Galaxy. Assuming standard SNe distribution models and theoretical estimates of the [sup 44]Ti yields, we constrain the Galactic supernova rate. We compare these constraints with those obtained from the historical record covering the last millennium. Relating the current supernova rate to the observed [sup 44]Ti solar abundance through chemical evolution models, agreement can be obtained only if there is a special type of supernova (e.g., helium detonations) that produces large amounts of [sup 44]Ti, but with a very low event rate. © 2000 American Institute of Physics.


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