Fibre Multi-Object Spectrograph (FMOS) for the Subaru Telescope

Masahiko Kimura, Toshinori Maihara, Fumihide Iwamuro, Masayuki Akiyama, Naoyuki Tamura, Gavin B. Dalton, Naruhisa Takato, Philip Tait, Kouji Ohta, Shigeru Eto, Daisaku Mochida, Brian Elms, Kaori Kawate, Tomio Kurakami, Yuuki Moritani, Junichi Noumaru, Norio Ohshima, Masanao Sumiyoshi, Kiyoto Yabe, Jurek BrzeskiTony Farrell, Gabriella Frost, Peter R. Gillingham, Roger Haynes, Anna M. Moore, Rolf Muller, Scott Smedley, Greg Smith, David G. Bonfield, Charles B. Brooks, Alan R. Holmes, Emma Curtis Lake, Hanshin Lee, Ian J. Lewis, Tim R. Froud, Ian A. Tosh, Guy F. Woodhouse, Colin Blackburn, Robert Content, Nigel Dipper, Graham Murray, Ray Sharples, David J. Robertson

    Research output: Contribution to journalArticlepeer-review

    101 Citations (Scopus)


    Fibre Multi-Object Spectrograph (FMOS) is the first near-infrared instrument with a wide field of view capable of acquiring spectra simultaneously from up to 400 objects. It has been developed as a common-use instrument for the F/2 prime-focus of the Subaru Telescope. The field coverage of 30' diameter is achieved using a new 3-element corrector optimized in the near-infrared (0.9-1.8 mu m) wavelength range. Due to limited space at the prime-focus, we have had to develop a novel fibre positioner, called "Echidna", together with two OH-airglow suppressed spectrographs. FMOS consists of three subsystems: the prime focus unit for IR, the fibre positioning system/connector units, and the two spectrographs. After full systems integration, FMOS was installed on the telescope in late 2007. Many aspects of the performance were checked through various test and engineering observations. In this paper, we present the optical and mechanical components of FMOS, and show the results of our on-sky engineering observations to date.

    Original languageEnglish
    Pages (from-to)1135-1147
    Number of pages13
    JournalPublications of the Astronomical Society of Japan
    Issue number5
    Publication statusPublished - 2010


    • cosmology: observations
    • instrumentation: spectrographs
    • surveys
    • telescopes: Subaru


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