2024/06/25 by Deborah Lokhorst, Lokhorst, Deborah M., Seery Chen +19
Engineering · Environmental Science · #Calibration and Measurement Techniques #FOS: Physical sciences #Infrared Target Detection Methodologies #Instrumentation and Methods for Astrophysics (astro-ph.IM) #Remote Sensing in Agriculture
paper · pdf · doi:10.48550/arxiv.2406.17979
openalex publication_date 2024/06/25 · openalex created_date 2024/06/28 · openalex updated_date 2026/07/28
The Dragonfly Spectral Line Mapper is an innovative all-refracting telescope designed to carry out ultra-low surface brightness wide-field mapping of visible wavelength line emission. Equipped with ultranarrowband (0.8 nm bandwidth) filters mounted in Dragonfly Filter-Tilter instrumentation, the Dragonfly Spectral Line Mapper maps Hα, [NII]λ6583, and [OIII]λ5007 line emission produced by structures with sizes ranging from ∼1 to 1000 kpc in the local Universe. These spatial scales encompass that of the exceedingly diffuse and faintly radiating circumgalactic medium, which is singularly difficult to detect with conventional mirror-based telescope instrumentation. Extremely careful control of systematics is required to directly image these large scale structures, necessitating high fidelity sky background subtraction, wavelength calibration, and specialized flat-fielding methods. In this paper, we discuss the on-sky performance of the Dragonfly Spectral Line Mapper with these methods in place.