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Two new young galactic supernova remnants

Abstract

Substantial reductions1–3 in the distances inferred for the remnants of several ‘historical’ supernovae, coupled with a galactic supernova rate of 1 every 25 yrs or so4, have raised the possibility5 that many young but distant galactic supernova remnants may be missing from present catalogues. We have now used the Very Large Array (VLA) and the Cambridge 5-km telescope to observe 32 small-diameter objects selected from galactic plane radio surveys. These observations reveal both a new young shell remnant (which, at only ∼1 arc min in extent, is the smallest angular size galactic remnant yet discovered), and a very peculiar radio source, probably a supernova remnant only a few hundred years old, which is still in the free expansion phase.

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Green, D., Gull, S. Two new young galactic supernova remnants. Nature 312, 527–529 (1984). https://doi.org/10.1038/312527a0

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