Radio continuum observations of LMC SNR J0550-6823

L. M. Bozzetto, M. D. Filipovic, E. J. Crawford, J. L. Payne, A. Y. De Horta, M. Stupar


We report on new Australia Telescope Compact Array (ATCA) observations of the Large Magellanic Cloud (LMC) supernova remnant (SNR) J0550-6823 (DEM L328). This object is a typical horseshoe SNR with a diameter of 373″ × 282″ ± 4″ (90 × 68 ± 1 pc), making it one of the largest known SNRs in the Local Group. We estimate a relatively steep radio spectral index of α=−0.79 ± 0.27. However, its stronger than expected polarisation of 50% ± 10% is atypical for older and more evolved SNRs. We also note a strong correlation between O III and radio images, classifying this SNR as oxygen dominant.

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