STUDY SUMMARY - IPMU

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<strong>SUMMARY</strong> REPORT WIDE FIELD FIBER-FED OPTICAL MULTI-OBJECT SPECTROMETER (WFMOS) 1.0 Introduction The Wide Field Fiber-Fed Optical Multi-Object Spectrometer (WFMOS) is a fiber-fed spectrograph designed to be mounted at the prime focus of the Subaru telescope. It has two primary science objectives: 1) investigations of dark energy via baryonic acoustic oscillations and redshift-space distortions, and 2) the determination of the assembly history of the Milky Way and nearby galaxies through the study of stellar dynamics and chemical abundances (Galactic Archaeology). Such an instrument also has tremendous potential for discoveries over a much broader area of astronomy including studies of galaxy formation and large scale structure. The WFMOS instrument is designed to allow simultaneous spectral investigations of 2,400 objects within a 1.3-degree field of view provided by the optical system of the Subaru Telescope. The combination of a large primary aperture (8.2 m) and a rapidly reconfigurable multiplex system provides the capability to survey up to 100,000 objects in a single clear night. WFMOS will use the Subaru primary mirror to focus light onto a focal plane incorporating 2,400 optical fibers. These fibers relay light to three remotely located spectrographs (800 fibers per spectrograph), which simultaneously record 2,400 spectra on arrays of CCD detectors. Data are processed and archived for further study and analysis by the WFMOS Data Reduction System. The WFMOS instrument, described in Section 3, is comprised of the major elements shown in Figure 1.0-1, which serves as a useful introductory guide. 3
<strong>SUMMARY</strong> REPORT WIDE FIELD FIBER-FED OPTICAL MULTI-OBJECT SPECTROMETER (WFMOS) Figure 1.0-1: WFMOS Instrument System Elements 4
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STUDY SUMMARY - IPMU

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