Emission from 44Ti associated with a previously unknown Galactic supernova

@article{Iyudin1998EmissionF4,
  title={Emission from 44Ti associated with a previously unknown Galactic supernova},
  author={Anatoli F. Iyudin and Volker Sch{\"o}nfelder and Kristin P. Bennett and Hans Gerald Bloemen and Roland Diehl and W. Hermsen and Giselher G. Lichti and R. D. van der Meulen and Janice Ryan and C. Winkler},
  journal={Nature},
  year={1998},
  volume={396},
  pages={142-144}
}
Nearly 400 years have passed since a supernova was last observed directly in the Milky Way (by Kepler, in 1604). Numerous Galactic supernovae are expected to have occurred since then, but only one (Cassiopeia A) may have been seen. The historical record of supernovae is therefore incomplete, as demonstrated by the spatial distribution of young supernova remnants. The discovery, of γ-ray emission from the decay of 44Ti nuclei associated with Cassiopeia A, the youngest known remnant, has revealed… 

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