Summary
SN1987A has an intrinsic radio luminosity some four orders of magnitude less than SN1993J at maximum, largely a reflection of the tenuous wind from the progenitor of SN1987A before explosion. Both remnants have an edge-brightened, ring-like morphology though, in the case of SN1987A, the expansion rate is currently only around 3500 km s−1. The flux density of the remnant of SN1987A continues to rise at all measured radio frequencies. Its spectral index is gradually flattening, indicating its transition into the supernova remnant phase. A campaign to increase the resolution of radio imaging by observing at higher frequencies is underway with the Australia Telescope Compact Array (ATCA).
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Staveley-Smith, L. et al. (2005). SN 1987A at Radio Wavelengths. In: Marcaide, JM., Weiler, K.W. (eds) Cosmic Explosions. Springer Proceedings in Physics, vol 99. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-26633-X_11
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