REID W.A., STUPAR M., BOZZETTO L.M., PARKER Q.A. and FILIPOVIC M.D.
Abstract (from CDS):
We present optical, radio and X-ray data that confirm a new supernova remnant (SNR) in the Large Magellanic Cloud (LMC) discovered using our deep Hα imagery. Optically, the new SNR has a somewhat filamentary morphology and a diameter of 56x64 arcsec (13.5x15.5 pc at the 49.9 kpc distance of the LMC). Spectroscopic follow-up of multiple regions show high [Sii]/Hα emission-line ratios ranging from 0.66±0.02 to 0.93±0.01, all of which are typical of an SNR. We found radio counterparts for this object using our new Australia Telescope Compact Array (ATCA) 6 cm pointed observations as well as a number of available radio surveys at 8640 MHz, 4850 MHz, 1377 MHz and 843 MHz. With these combined data we provide a spectral index α ~ -0.5 between 843 and 8640 MHz. Both spectral line analysis and the magnetic field strength, ranging from 124to184µG, suggest a dynamical age between ∼ 2200 and ∼ 4700 yr. The SNR has a previously catalogued X-ray counterpart listed as HP 483 in the ROSAT Position Sensitive Proportional Counter (PSPC) catalogue.