Three unusual supernova remnants

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Abstract
The radio sources G326.3 – 1.8, G348.5 + 0.1 and G348.7 + 0.3 have been observed with a resolution of 0.8 arcmin using the 1.4-GHz Fleurs synthesis telescope and 2.2 arcmin at 14.7 GHz with the Parkes 64-m telescope. These observations, in combination with lower-resolution measurements over a wide frequency range, confirm that each source is a supernova remnant in our galaxy. G348.5 + 0.1 (CTB 37A) and G348.7 + 0.3 (CTB 37B) are of similar size and brightness and, in projection, are separated by little more than their own diameter. ‘Emerging’ from the shell of G348.5 + 0.1 there is a remarkable ‘jet’ – a feature not previously found among supernova remnants. G326.3 – 1.8 (MSH 15-56) is also unusual in that it possesses not only a shell typical of most supernova remnants but also a flat-spectrum central core which shows marked similarities to the Crab nebula.

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