Catalogue of known Galactic SNRs uncovered in HAalpa light
M. Stupar, Q. A. Parker

TL;DR
This study uncovers optical HAlpha emission associated with known Galactic SNRs using high-resolution survey data, increasing the number of optically identified remnants and providing detailed morphological information.
Contribution
The paper presents the first detection of optical counterparts for about 24 known SNRs, expanding the catalog of optically observed remnants and demonstrating the effectiveness of high-resolution HAlpha surveys.
Findings
Detected HAlpha emission in ~24 known SNRs previously identified only in radio/X-ray.
Enhanced visualization of faint SNR features using quotient imaging techniques.
Increased the number of optically identified SNRs by about one-third.
Abstract
During detailed searches for new Galactic supernova remnants (SNRs) in the Anglo Australian Observatory/United Kingdom Schmidt Telescope (AAO/UKST) HAlpha survey of the southern Galactic plane, we also uncovered, for the first time, possible associated HAlpha emission in the vicinity of about 24 known Galactic SNRs previously known solely from radio or X-ray observations.The possible optical counterparts to these known SNR were detected due to the 1 arcsecond resolution and 5 Rayleigh sensitivity of this HAlpha survey. The newly discovered emission frequently exhibits the typical filamentary form of other optically detected SNRs although sometimes the HAlpha emission clouds or fragmented filaments largely inside an SNR extend over the radio border. It is true that superposition of general diffuse and extended Galactic emission in the region of these remnants is a complicating factor,…
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