by Dick Manchester (CASS)

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.