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Proceedings Paper

MOIRCS: multi-object infrared camera and spectrograph for SUBARU
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Paper Abstract

MOIRCS is a new Cassegrain instrument of Subaru telescope, dedicated for wide field imaging and multi-object spectroscopy in near-infrared. MOIRCS has been constructed jointly by Tohoku University and the Subaru Telescope and saw the first light in Sept., 2004. The commissioning observations to study both imaging and spectroscopic performance were conducted for about one year. MOIRCS mounts two 2048 × 2048 HAWAII2 arrays and provides a field of view of 4' x 7' with a pixel scale of 0."117. All-lens optical design is optimized for 0.8 to 2.5 μm with no practical chromatic aberration. Observations confirm the high image quality over the field of view without any perceptible degradation even at the field edge. The best seeing we have obtained so far is FWHM=0."18. A novel design of MOIRCS enables us to perform multi-object spectroscopy with aluminum slit masks, which are housed in a carrousel dewar and cooled to ~ 110 K. When choosing MOS mode, a manipulator pulls out a slit mask from the carrousel into the MOIRCS main dewar and sets it properly at the Cassegrain focus. The carrousel is shuttered by a gate valve, so that it can be warmed and cooled independently to exchange slit-mask sets during daytime. We have tested various configurations of 30 or more multi-slit positions in various sky fields and found that targets are dropped at the centers of slits or guide holes within a dispersion of about 0.3 pixels (0."03). MOIRCS has been open to common use specifically for imaging observations since Feb. 2006. The MOS function will be available in next August.

Paper Details

Date Published: 28 June 2006
PDF: 12 pages
Proc. SPIE 6269, Ground-based and Airborne Instrumentation for Astronomy, 626916 (28 June 2006); doi: 10.1117/12.670078
Show Author Affiliations
Takashi Ichikawa, Astronomical Institute, Tohoku Univ. (Japan)
Ryuji Suzuki, Astronomical Institute, Tohoku Univ. (Japan)
Subaru Telescope (United States)
Chihiro Tokoku, Astronomical Institute, Tohoku Univ. (Japan)
Subaru Telescope (United States)
Yuka Katsuno Uchimoto, Astronomical Institute, Tohoku Univ. (Japan)
Subaru Telescope (United States)
Institute of Astronomy, Univ. of Tokyo (Japan)
Masahiro Konishi, Astronomical Institute, Tohoku Univ. (Japan)
Subaru Telescope (United States)
Tomohiro Yoshikawa, Astronomical Institute, Tohoku Univ. (Japan)
Subaru Telescope (United States)
Toru Yamada, Subaru Telescope (United States)
National Astronomical Observatory of Japan (Japan)
Ichi Tanaka, Astronomical Institute, Tohoku Univ. (Japan)
Subaru Telescope (United States)
Koji Omata, Subaru Telescope (United States)
Tetsuo Nishimura, Subaru Telescope (United States)


Published in SPIE Proceedings Vol. 6269:
Ground-based and Airborne Instrumentation for Astronomy
Ian S. McLean; Masanori Iye, Editor(s)

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