New Optically Identified Supernova Remnants in the Large Magellanic Cloud

TL;DR

This paper reports the discovery of new optical supernova remnants in the Large Magellanic Cloud, expanding the known population and suggesting the existence of an older, larger class of remnants that are optically visible but faint in radio and X-ray.

Contribution

The study introduces a new optical sample of 19 SNRs and candidates in the LMC, confirming their nature through imaging and spectroscopy, and highlights their larger sizes and potential evolutionary stage.

Findings

Most SNRs are located in less dense regions of the LMC.

Spectroscopy confirms high [SII]/Hα ratios indicative of SNRs.

Candidates are significantly larger than previously known LMC SNRs.

Abstract

We present a new optical sample of three Supernova Remnants and 16 Supernova Remnant (SNR) candidates in the Large Magellanic Cloud(LMC). These objects were originally selected using deep H$\alpha$, [SII] and [OIII] narrow-band imaging. Most of the newly found objects are located in less dense regions, near or around the edges of the LMC's main body. Together with previously suggested MCSNR J0541-6659, we confirm the SNR nature for two additional new objects: MCSNR J0522-6740 and MCSNRJ0542-7104. Spectroscopic follow-up observations for 12 of the LMC objects confirm high [SII]/H$\alpha$ a emission-line ratios ranging from 0.5 to 1.1. We consider the candidate J0509-6402 to be a special example of the remnant of a possible Type Ia Supernova which is situated some 2$^\circ$ ($\sim 1.75$kpc) north from the main body of the LMC. We also find that the SNR candidates in our sample are significantly larger in size than the currently known LMC SNRs by a factor of $\sim 2$. This could potentially imply that we are discovering a previously unknown but predicted, older class of large LMC SNRs that are only visible optically. Finally, we suggest that most of these LMC SNRs are residing in a very rarefied environment towards the end of their evolutionary span where they become less visible to radio and X-ray telescopes.