The Dark Energy Camera Magellanic Clouds Emission-Line Survey
Sean D. Points, Knox S. Long, William P. Blair, Rosa Williams, You-Hua, Chu, P. Frank Winkler, Richard L. White, Armin Rest, Chuan-Jui Li, and, Francisco Valdes

TL;DR
The DeMCELS survey provides high-resolution, deep emission-line imaging of the Large Magellanic Cloud, revealing detailed nebular structures and shock interactions, surpassing previous surveys in resolution and depth.
Contribution
This work introduces the DeMCELS survey, a new high-resolution, wide-area emission-line survey of the LMC using DECam, improving upon previous data in resolution and sensitivity.
Findings
Enhanced morphological detail of nebulae and supernova remnants.
Detection of significant [SII]/H-alpha ratio variations indicating shock interactions.
Survey data made publicly available for community use.
Abstract
We have used the Dark Energy Camera (DECam) on the CTIO Blanco 4-m telescope to perform a new emission-line survey of the Large Magellanic Cloud (LMC) using narrow-band H-alpha and [SII] filters in addition to a continuum band for use in creating pure emission-line images. We refer to this new survey as DeMCELS, to distinguish it from the earlier Magellanic Cloud Emission Line Survey (MCELS) that has been in service for nearly 25 years. DeMCELS covers degrees, encompassing most of the bright optical disk of the LMC. With DECam's pixel size of only 0.27", our DeMCELS survey provides a seeing-limited improvement of 3-5 times over MCELS and is comparable in depth, with surface brightness limits of 3.3E-17 erg cm s arcsec in H-alpha and 2.9E-17 erg cm s arcsec in H-alpha and [SII], respectively. DeMCELS provides detailed…
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