The fading radio emission from sn 1961V: Evidence for a type II peculiar supernova?

摘要

Using the Very Large Array (VLA), we have detected radio emission from the site of SN 1961V in the Sc galaxy NGC 1058. With a peak flux density of 0.063 +/- 0.008 mJy beam(-1) at 6 cm and 0.147 +/- 0.026 mJy beam(-1) at 18 cm, the source is nonthermal, with a spectral index of -0.79 +/- 0.23. Within error, this spectral index is the same value reported for previous VLA observations taken in 1984 and 1986. The radio emission at both wavelengths has decayed sine the mid-1980s observations with power-law indices of beta (20) (cm) = -0.69 +/- 0.23 and beta (6) (cm) = -1.75 +/- 0.16. We discuss the radio properties of this source and compare them with those of Type II radio supernovae and luminous blue variables. References: 36