Early imaging observations with the ATCA
(Staveley-Smith
et al. 1993) showed that the radio supernova remnant had an annular form
with a diameter of about 1.5 arcsec and a somewhat asymmetric east-west flux
density distribution. The highest-resolution radio images have been obtained
using the ATCA at high frequencies - the picture, from Zanardo et al. 2013, 767, 98,
shows a diffraction-limited 44 GHz image illustrating this asymmetry and also
the clumpy nature of the ring. These clumps roughly correspond to those seen
in X-rays using the Chandra X-ray Observatory. There is a hint of a central
emission nebula which could be associated with a pulsar born in the SN
explosion.
