Multifrequency Observations of One of the Largest Supernova Remnants in the Local Group of Galaxies, LMC - SNR J0450-709

TL;DR

This study presents multifrequency radio observations of the large supernova remnant SNR J0450-709 in the LMC, revealing its morphology, spectral index, and polarization characteristics, contributing to understanding of old SNR properties.

Contribution

First detailed radio analysis of SNR J0450-709 in the LMC, providing insights into its structure, spectral index, and polarization, enhancing knowledge of evolved supernova remnants.

Findings

Diameter approximately 102x75 pc.

Radio spectral index of -0.43.

Polarization up to 40%.

Abstract

We present the results of new Australia Telescope Compact Array (ATCA) observations of one of the largest supernova remnants, SNR J0450-709, in the Local Group of galaxies. We found that this Large Magellanic Cloud (LMC) ob ject exhibits a typical morphology of an old supernova remnant (SNR) with diameter D=102x75+-1 pc and radio spectral index alpha=-0.43+-0.06. Regions of high polarisation were detected with peak value of ~40%.