FMOS: the Fiber Multiple-Object Spectrograph is the next common-use instrument of the Subaru Telescope,
having a capability of 400 targets multiplicity in the near-infrared 0.9-1.8μm wavelength range with a field
coverage of 30' diameter. FMOS consists of three units: 1) the prime focus unit including the corrector lenses,
the Echidna fiber positioner, and the instrument-bay to adjust the instrument focus and shift the axis of the
corrector lens system, 2) the fiber bundle unit equipping two fiber slits on one end and a fiber connector box with
the back-illumination mechanism on the other end on the bundle, 3) the two infrared spectrographs (IRS1 and
IRS2) to obtain 2×200 spectra simultaneously. After all the components were installed in the telescope at the
end of 2007, the total performance was checked through various tests and engineering observations. We report
the results of these tests and demonstrate the performance of FMOS.
Fibre Multi-Object Spectrograph (FMOS) is the next common-use instrument of Subaru Telescope. FMOS consists of
three subsystems; the Prime focus unit for Infrared (PIR), the fibre positioning system/connector units, and the two
infrared spectrographs. The PIR was transferred to the Subaru Observatory in the spring of 2005 to check the optical
performance on the telescope. As a result of the test observation, we found that the adjustment of the optical axis
between PIR and the primary mirror was difficult with the initial design of the corrector alignment stage. Furthermore,
the optical axis of the telescope moved over a little owing to an earthquake in Hawaii Island in Oct. 2006. Therefore we
decided to modify mechanical structure of PIR, the corrector alignment stage as well as the cable wrapping system. This
modification was completed in the summer of 2007. In this proceeding, we report the mechanical structure of the new
PIR and the results of the engineering observations.
Fibre Multi-Object Spectrograph (FMOS) is one of the second-generation instruments of Subaru Telescope. FMOS is consisted of a number of subsystems; the Prime focus unit for IR (called PIR), the fibre positioning system/connector units, and the two spectrographs. The PIR and one spectrograph were made in Kyoto University, and were brought to the Subaru telescope last spring. The PIR attached to the telescope and stellar images were obtained for optical alignment in July and October last year. We report on these engineering run in this proceeding.
The Fiber Multiple-Object Spectrograph for Subaru Telescope (FMOS) is quite large instrument composed of
the prime focus unit, the fiber bundle unit, and the two infrared spectrographs. Among these units, a part of the
prime focus unit and one of the spectrograph were transported from Kyoto University to the Subaru Observatory
in the middle of 2005. We present the optical and the mechanical components of the spectrograph, which was
reassembled on the new floor of the Subaru dome. We also show the preliminary results of the optical alignment
and the cooling test of the instrument at the summit of Mauna Kea.
The Fibre Multi-Object Spectrograph (FMOS) for the primary focus
of Subaru Telescope is one of the second generation
instruments, aiming at acquiring spectra of faint objects with
target multiplicity of up to 400. The optimised wavelengths span
from 0.9 to 1.8 microns so as to extend our knowledge of galaxy
formations and evolutions at higher redshifts in a systematic way,
as well as of variety of intriguing near-infrared objects.
On the basis of detailed design of FMOS, actual processes of
fabrication are in progress, and some of critical hardware
components have successfully been developed. In this report,
we present the status of the FMOS project, the results of
developed components, and also instrument control systems such
as the new detector electronics as well the related contol
The Fibre Multi-Object Spectrograph (FMOS) is a second-generation common-use instrument of the Subaru telescope. Under an international collaboration scheme of Japan, UK, and Australia, a realistic design of FMOS has been already in completion, and the fabrications of hardware components have been in progress. We present the overall design details together with the special features of FMOS subsystems, such as the prime focus corrector, the prime focus mechanical unit including fiber positioners, and the near-infrared spectrograph, etc.