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OHS: OH-airglow Suppressor for the Subaru Telescope

F. Iwamuro·K. Motohara·T. Maihara·R. Hata·T. Harashima
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Abstract

This paper describes an OH-airglow Suppressor (OHS) for the infrared Nasmyth focus of the Subaru telescope. OHS has the capability of eliminating 224 airglow-lines in the $J$- and $H$-bands, which are major sources of background radiation at near-infrared wavelengths up to 2 $μ$m. Specifically, it is a pre-optics system installed between the telescope and an infrared camera/spectrograph (CISCO). The suppressor reduces sky background emissions to 1/25 and its throughput is 40%. As a result, the S/N gain achieved with OHS is more than 1 mag compared to the typical spectroscopic approach. The limiting magnitude measured during a test observing run was found to be $H$ = 21.1 mag ($λ/Δλ$ = 210, S/N = 5) in the standard 4000 s exposure sequence.

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F. Iwamuro, K. Motohara, T. Maihara, R. Hata, T. Harashima. 2001-02-23. OHS: OH-airglow Suppressor for the Subaru Telescope. https://doi.org/10.1093/pasj%2F53.2.355

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