Radio-continuum study of Large Magellanic Cloud supernova remnant J0509-6731

We present a detailed study of Australia Telescope Compact Array (ATCA) observations (� = 20, 13, 6 & 3 cm) of supernova remnant (SNR) J0509–6731 in the Large Magellanic Cloud (LMC). The remnant has a ring morphology with brightened regions towards the south-western limb. We also find a second brightened inner ring which is only seen in the radio-continuum. The SNR is almost circular, with a diameter ranging from 7 to 8 pc, and a steep radio spectral index between 36 and 3 cm of � = 0.73 ± 0.02, which is characteristic of younger SNRs. We also report detection of radially orientated polarisation across the remnant at 6 cm, with a mean fractional

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