STUDY OF A GIANT LARGE MAGELLANIC CLOUD SUPERNOVA REMNANT, VELIKI (J0450.4−7050) ISTRAIVANjE ||INOVSKOG OSTATKA SUPERNOVE U VELIKOM MAGELANOVOM OBLAKU: VELIKI (J0450.4−7050)
Smeaton ZJ, Filipović MD, Alsaberi RZ, Arbutina B, Cotton WD, Crawford EJ, Hopkins AM, Kothes R, Leahy D, Payne JL, Rajabpour N, Sano H, Sasaki M, Urošević D, van Loon JT (2025)
Publication Type: Journal article
Publication year: 2025
Journal
Pages Range: 13-32
Journal Issue: 210
DOI: 10.2298/SAJ2510013S
Abstract
We present a high-resolution radio-continuum view and multi-frequency analysis of the Large Magellanic Cloud (LMC) Supernova Remnant (SNR) J0450.4−7050, which we nicknamed Veliki. These high-resolution observations reveal a larger extent than previously measured, making J0450.4−7050 one of the largest SNRs that we know of. Additionally, we observe a higher than expected radio surface brightness and an unusually flat spectral index (α = −0.26 ± 0.02), with little spectral variation over the remnant. We observe a bright Hα shell indicating significant cooling over the remnant, but also an excess of [Oiii] on the eastern shock front. We investigate several theoretical scenarios to explain the emission and radio evolution of J0450.4−7050 in the context of the LMC environment, and determine that this is most likely an older, predominantly radiative, SNR with a higher shock compression ratio, which gives a flatter non-thermal spectrum in combination with thermal (bremsstrahlung) emission contribution.
Authors with CRIS profile
Involved external institutions
University of Western Sydney
Australia (AU)
University of Belgrade / Универзитет у Београду
Serbia (RS)
National Radio Astronomy Observatory
United States (USA) (US)
Macquarie University
Australia (AU)
National Research Council / Conseil national de recherches Canada
Canada (CA)
University of Calgary
Canada (CA)
Gifu University / 岐阜大学
Japan (JP)
University of Keele
United Kingdom (GB)
Australia (AU)
University of Belgrade / Универзитет у Београду
Serbia (RS)
National Radio Astronomy Observatory
United States (USA) (US)
Macquarie University
Australia (AU)
National Research Council / Conseil national de recherches Canada
Canada (CA)
University of Calgary
Canada (CA)
Gifu University / 岐阜大学
Japan (JP)
University of Keele
United Kingdom (GB)
How to cite
APA:
Smeaton, Z.J., Filipović, M.D., Alsaberi, R.Z., Arbutina, B., Cotton, W.D., Crawford, E.J.,... van Loon, J.T. (2025). STUDY OF A GIANT LARGE MAGELLANIC CLOUD SUPERNOVA REMNANT, VELIKI (J0450.4−7050) ISTRAIVANjE ||INOVSKOG OSTATKA SUPERNOVE U VELIKOM MAGELANOVOM OBLAKU: VELIKI (J0450.4−7050). Serbian Astronomical Journal, 210, 13-32. https://doi.org/10.2298/SAJ2510013S
MLA:
Smeaton, Z. J., et al. "STUDY OF A GIANT LARGE MAGELLANIC CLOUD SUPERNOVA REMNANT, VELIKI (J0450.4−7050) ISTRAIVANjE ||INOVSKOG OSTATKA SUPERNOVE U VELIKOM MAGELANOVOM OBLAKU: VELIKI (J0450.4−7050)." Serbian Astronomical Journal 210 (2025): 13-32.
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