An on-sky atmospheric calibration of SPT-SLIM

Dibert, K. R., Adamic, M., Anderson, A. J., Barry, P. S., Benson, B. A., Benson, C. S. and Robson, G. 2026. An on-sky atmospheric calibration of SPT-SLIM. IEEE Transactions on Applied Superconductivity 10.1109/tasc.2026.3724254

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Abstract

We present the methodology and results of the on-sky responsivity calibration of the South Pole Telescope Shirokoff Line Intensity Mapper (SPT-SLIM). SPT-SLIM is a pathfinder line intensity mapping experiment utilizing the on-chip spectrometer technology, and was first deployed during the 2024-2025 Austral Summer season on the South Pole Telescope. During the two-week on-sky operation of SPT-SLIM, we performed periodic measurements of the detector response as a function of the telescope elevation angle. Combining these data with atmospheric opacity measurements from an on-site atmospheric tipping radiometer, simulated South Pole atmospheric spectra, and measured detector spectral responses, we construct estimates for the responsivity of SPT-SLIM detectors to sky loading. We then use this model to calibrate observations of the moon taken by SPT-SLIM, cross-checking the result against the known brightness temperature of the Moon as a function of its phase.

Item Type:	Article
Date Type:	Published Online
Status:	In Press
Schools:	Schools > Physical, Chemical & Environmental Sciences Schools > Physics and Astronomy
Additional Information:	For full author list please see - https://doi.org/10.1109/TASC.2026.3724254
Publisher:	Institute of Electrical and Electronics Engineers (IEEE)
ISSN:	1051-8223
Last Modified:	24 Aug 2026 12:30
URI:	https://orca.cardiff.ac.uk/id/eprint/189150

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