Abstract
THE radio source Cassiopeia A (Cas A) is believed to be the remnant of a type II supernova that occurred in our galaxy about 280 yr ago (refs 1 and 2). The radio remnant forms an irregular shell of radius ∼2′, corresponding to ∼1.6 pc at its distance of 2.8 kpc (ref. 2), which is broadly coincident with an incomplete shell of fast-moving optical knots1. We present here a new radio map of the source with a resolution three times greater than has previously been achieved3.
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References
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BELL, A., GULL, S. & KENDERDINE, S. New radio map of Cassiopeia A at 5 GHz. Nature 257, 463–465 (1975). https://doi.org/10.1038/257463a0
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DOI: https://doi.org/10.1038/257463a0
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