Multifrequency study of SNR J0533-7202, a new supernova remnant in the LMC

Authors :: Bozzetto, L. M.
Filipović, M. D.
Crawford, E. J.
Sasaki, M.
Maggi, P.
Haberl, F.
Urošević, D.
Payne, J. L.
De Horta, A. Y.
Stupar, M.
Gruendl, R.
Dickel, J.
Publication Year :: 2013
Abstract: We present a detailed study of Australia Telescope Compact Array (ATCA) observations of a newly discovered Large Magellanic Cloud (LMC) supernova remnant (SNR), SNR J0533-7202. This object follows a horseshoe morphology, with a size 37 pc x 28 pc (1-pc uncertainty in each direction). It exhibits a radio spectrum with the intrinsic synchrotron spectral index of alpha= -0.47+-0.06 between 73 and 6 cm. We report detections of regions showing moderately high fractional polarisation at 6 cm, with a peak value of 36+-6% and a mean fractional polarisation of 12+-7%. We also estimate an average rotation measure across the remnant of -591 rad m^-2. The current lack of deep X-ray observation precludes any conclusion about high-energy emission from the remnant. The association with an old stellar population favours a thermonuclear supernova origin of the remnant.<br />Comment: 6 pages, 5 figures accepted to Monthly Notices of the Royal Astronomical Society