The radio recovery of SN 1970G in M101

Details The radio recovery of SN 1970G in M101 The radio recovery of SN 1970G in M101

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...379l..49c&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 379, Oct. 1, 1991, p. L49-L51.

Astronomy and Astrophysics

Astronomy

21

Radio Emission, Stellar Evolution, Supernova Remnants, Radio Sources (Astronomy), Stellar Luminosity, Supernova 1987A, Very Large Array (Vla)

Scientific paper

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 + or - 0.021 mJy at 20 cm, 0.08 + or - 0.013 mJy at 3.5 cm, a spectral index of -0.56 + or - 0.11, and an absolute luminosity of approximately 25 percent of Cas A, SN 1970 G is similar to other extragalactic, intermediate-age radio supernovae such as 1957D in M83 and 1961V in NGC 1058. The radio emission from SN 1970G has been decaying since the last reliable detection in 1974 with a power-law index of -1.95 + or - 0.17, indicating a steeper decay rate than in the early stages of radio supernova evolution.

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