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

Ghavam M, Filipović MD, Alsaberi R, Barnes L, Crawford EJ, Haberl F, Kavanagh P, Maggi P, Payne J, Rowell G, Hidetoshi S, Sasaki M, Rajabpour N, Tothill N, Urošević D (2024)

Publication Type: Journal article

Publication year: 2024

Journal

Publications of the Astronomical Society of Australia Cambridge University Press (CUP)

Book Volume: 41

Article Number: e089

DOI: 10.1017/pasa.2024.73

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 ∼1 300 km s−1, based on its distance (∼10 pc) from the remnant’s geometric centre and estimated age (∼7 600 yr). we estimated the radio spectral index, α = −0.55 ± 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±1% and 10±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±65 rad m−2 and the maximum value of RM is 591±103 rad m−2.

Authors with CRIS profile

Manami Sasaki Professur für Multiwellenlängenastronomie

Involved external institutions

University of Western Sydney AU Australia (AU) Max-Planck-Institut für extraterrestrische Physik (MPE) / Max Planck Institute for Extraterrestrial Physics DE Germany (DE) Dublin Institute for Advanced Studies (DIAS) IE Ireland (IE) Université de Strasbourg (UDS) FR France (FR) Gifu University / 岐阜大学 JP Japan (JP) University of Belgrade / Универзитет у Београду RS Serbia (RS)

How to cite

APA:

Ghavam, M., Filipović, M.D., Alsaberi, R., Barnes, L., Crawford, E.J., Haberl, F.,... Urošević, D. (2024). New radio continuum study of the large magellanic cloud supernova remnant N49. Publications of the Astronomical Society of Australia, 41. https://doi.org/10.1017/pasa.2024.73

MLA:

Ghavam, Maddie, et al. "New radio continuum study of the large magellanic cloud supernova remnant N49." Publications of the Astronomical Society of Australia 41 (2024).

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