Abstract
Radio emission has been detected from the Type II SN 1970G in M101 20 yr after the explosion. This marks the third definite (and probably the fourth) radio detection of such intermediate-age supernovae, which fill the void between the young radio supernovae and the supernova remnants that are typically hundreds of years old. With a flux density of 0.21±0.021 mJy at 20 cm, 0.08±0.013 mJy at 3.5 cm, a spectral index of α=−0.56±0.11, and an absolute luminosity of approximately 25% of Cas A, SN 1970G is similar to other extragalactic, intermediate-age radio supernovae such as 1957D in M83 and 1961V in NGC 1058
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