Radio-continuum study of Large Magellanic Cloud Supernova Remnant J0509-6731

Abstract

We present a detailed study of Australia Telescope Compact Array (ATCA) observations ($\lambda$ = 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 $\alpha =-0.73\pm 0.02$, which is characteristic of younger SNRs. We also report detection of radially orientated polarisation across the remnant at 6~cm, with a mean fractional polarisation level of $P\cong$~(26~$\pm$~13)%. We find the magnetic field ($\sim$168~$\mu$G) and $\Sigma -D$ ($\Sigma =$ $1.1\times 10^{-19}$~W m${}^{-2}$~Hz${}^{-1}$~sr${}^{-1}$ , $D=$ 7.35~pc) to be consistent with other young remnants.

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