NOAO >   Observing Info >   Approved Programs >   2020B-0017

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Program Information for 2020B-0017


PI: P Frank Winkler, Middlebury College, winkler@middlebury.edu
Address: Dept. of Physics, Bicentennial Way, Middlebury, VT 05753 USA

CoI: Knox S Long, STScI
CoI: William P Blair, Johns Hopkins U.
CoI: Sean Points, NOIRLab

Title: Characterizing [Fe II] Near-IR Line Strength Variations in LMC Supernova Remnants

Abstract: Historically, most supernova remnants (SNRs) in nearby galaxies have been identified optically as emission nebulae with sii,$lambdalambda17,6731 to H$alpha$ ratios higher than for hii regions. But now modern IR detectors, especially on {em HST} (and on {em JWST} in future), make it possible to use feii,$lambdalambda.257, 1.644$mu$m to Pa$beta$ ratios in a similar fashion in the near IR, as our own work on M83 and NGC6946 has shown. The Magellanic Clouds have perhaps the best studied population of SNRs that exists. Because all the SNRs are at a common (and well known) distance---close enough that objects are well resolved from the ground, they form the foundation for much of the entire field of SNR research. However, systematic studies of the near-IR properties of SNRs in the Magellanic Clouds are sorely lacking. Here we propose to rectify this situation by first imaging a large sample of SNRs in the Large Magellanic Cloud in feii,$lambda.644 $mu$m, and then obtaining near-IR spectra of these objects. The imaging will allow us to explore the spatial relationships between feii emission and those at X-ray and optical wavelengths. The spectra will then enable us to measure physical conditions in the feii emitting regions, and to provide a solid observational basis for establishing the important line ratios and how they may vary.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2020B):  SOAR/Spartan -- 1n on Oct 30 2020
Run 2 (2020B):  SOAR/TSpec -- 2n on Nov 28 - Nov 29 2020


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