Multi-object infrared camera and spectrograph (MOIRCS) for the Subaru telescope I. Imaging

Ryuji Suzuki, Chihiro Tokoku, Takashi Ichikawa, Yuka Katsuno Uchimoto, Masahiro Konishi, Tomohiro Yoshikawa, Ichi Tanaka, Toru Yamada, Koji Omata, Tetsuo Nishimura

Research output: Contribution to journalArticlepeer-review

114 Citations (Scopus)


MOIRCS is a fully cryogenic near-infrared instrument for the 8.2 m Subaru Telescope. MOIRCS has two observation modes: a wide-field imaging mode and a multiobject spectroscopy mode. This paper describes the imaging mode, its specifications, and actual performances that we confirmed through laboratory tests and commissioning observations. The imaging mode provides a 4′ × 7′ field of view with a pixel scale of 0″. 17 pixel -1 in the wavelength range of 0.85 to 2.5 μm using cooled optics and two 2048 × 2048 HgCdTe HAWAII-2 focal plane arrays. Good-quality images are obtained over the entire field of view with practically no chromatic aberration. The limiting magnitudes for a point source estimated from observed background brightness and throughput are 23.7 in the J band, 23.0 in the H band, and 22.6 in the Ks band (Vega) with S/N = 5, 0″.5 seeing, 1″.0 aperture, and 1 hr exposure.

Original languageEnglish
Pages (from-to)1347-1362
Number of pages16
JournalPublications of the Astronomical Society of Japan
Issue number6
Publication statusPublished - 2008
Externally publishedYes


  • Infrared: general
  • Instrumentation: Detectors

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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