Multifrequency Radio Observations of a SNR in the LMC. The Case of SNR J0527-6549 (DEM l204)

TL;DR

This paper reports detailed multifrequency radio observations of the large, aged supernova remnant SNR J0527-6549 in the LMC, revealing its morphology, spectral index, and polarization properties.

Contribution

It provides new high-resolution radio data and analysis of SNR J0527-6549, highlighting its size, spectral index, and polarization, which are valuable for understanding its evolution.

Findings

SNR J0527-6549 has a large diameter of ~66x58 pc.

The spectral index is steeper than typical for young SNRs, at -0.92.

High polarization regions with up to 54% at 6 cm were detected.

Abstract

We present a detailed study and results of new Australia Telescope Compact Array (ATCA) observations of supernova remnant, SNR J0527-6549. This Large Magellanic Cloud (LMC) ob ject follows a typical supernova remnant (SNR) horseshoe morphology with a diameter of D=(66x58)+-1 pc which is among the largest SNRs in the LMC. Its relatively large size indicates older age while a steeper than expected radio spectral index of aplha=-0.92+-0.11 is more typical for younger and energetic SNRs. Also, we report detections of regions with a high order of polarization at a peak value of ~54+-17% at 6 cm.