CISCO: Cooled Infrared Spectrograph and Camera for OHS on the Subaru Telescope

This paper describes a Cooled Infrared Spectrograph and Camera for OHS (CISCO), mounted on the Nasmyth focus of the Subaru telescope. It is primarily designed as a back-end camera of the OH-Airglow Suppressor (OHS), and is also used as an independent, general-purpose near-infrared camera/spectrograph. CISCO is based on a single 1024 × 1024 format HgCdTe HAWAII array detector, and is capable of either wide-field imaging of 1 .8 × 1 .8 field-of-view or low-resolution spectroscopy from 0.9 to 2.4 μ m. The limiting magnitudes measured during test observations were found to be J=23.5 \,mag and K^ = 22.4 \,mag (imaging, 1 aperture, S / N = 5, 1 hr exposure).