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

• Published in: Publications of the Astronomical Society of Japan 2002-04, Vol.54 (2), p.315-325
• Main Authors: Motohara, Kentaro, Iwamuro, Fumihide, Maihara, Toshinori, Oya, Shin, Tsukamoto, Hiroyuki, Imanishi, Masatoshi, Terada, Hiroshi, Goto, Miwa, Iwai, Jun’ichi, Tanabe, Hirohisa, Hata, Ryuji, Taguchi, Tomoyuki, Harashima, Takashi
• Format: Article
• Language: English
• ISSN: 0004-6264; 2053-051X
• DOI: 10.1093/pasj/54.2.315

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 \times 1024$ format HgCdTe HAWAII array detector, and is capable of either wide-field imaging of $ {1\rlap {.}{}^{\mathrm {\prime }}8} \times {1\rlap {.}{}^{\mathrm {\prime }}8}$ field-of-view or low-resolution spectroscopy from 0.9 to 2.4 $ {\mu \mathrm {m}}$ . The limiting magnitudes measured during test observations were found to be $ J=23.5 \,\mathrm{mag}$ and $ K^{\prime} = 22.4 \,\mathrm{mag}$ (imaging, $ {1{}^{\mathrm {\prime \prime }}}$ aperture, $ \mathrm{S} / \mathrm{N} = 5 $ , 1 hr exposure).