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 x 1024 format HgCdTe HAWAII array detector, and is capable of either wide-field imaging of 1.'8 x 1.'8 field-of-view or low-resolution spectroscopy from 0.9 to 2.4 mum. 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).