EUROPEAN SPACE AGENCY

New radio continuum study of the large magellanic cloud supernova remnant N49

DOI: 10.1017/pasa.2024.73 Bibcode: 2024PASA...41...89G

Sasaki, Manami; Haberl, Frank; Kavanagh, Patrick; Maggi, Pierre; Filipović, Miroslav D.; Crawford, Evan J.; Rowell, Gavin; Urošević, Dejan; Tothill, Nicholas; Ghavam, Maddie; Alsaberi, Rami; Barnes, Luke; Payne, Jeffrey; Hidetoshi, Sano; Rajabpour, Neda

Australia, Germany, Ireland, France, Japan, Serbia

Abstract

We present new Australia Telescope Compact Array (ATCA) radio observations towards N 49, one of the brightest extragalactic supernova remnants (SNRs) located in the Large Magellanic Cloud (LMC). Our new and archival ATCA radio observations were analysed along with Chandra X-ray data. These observations show a prominent 'bullet' shaped feature beyond the southwestern boundary of the SNR. Both X-ray morphology and radio polarisation analysis support a physical connection of this feature to the SNR. The 'bullet' feature's apparent velocity is estimated at $\sim$ 1 300 km s $^{-1}$ , based on its distance ( $\sim$ 10 pc) from the remnant's geometric centre and estimated age ( $\sim$ 7 600 yr). we estimated the radio spectral index, $\alpha= -0.55 \pm 0.03$ which is typical of middle-age SNRs. Polarisation maps created for N 49 show low to moderate levels of mean fractional polarisation estimated at 7 $\pm$ 1% and 10 $\pm$ 1% for 5.5 and 9 GHz, respectively. These values are noticeably larger than found in previous studies. Moreover, the mean value for the Faraday rotation of SNR N 49 from combining CABB data is 212 $\pm$ 65 rad m $^{-2}$ and the maximum value of RM is 591 $\pm$ 103 rad m $^{-2}$ .

2024 • Publications of the Astronomical Society of Australia
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