STUDY SUMMARY - IPMU

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<strong>SUMMARY</strong> REPORT WIDE FIELD FIBER-FED OPTICAL MULTI-OBJECT SPECTROMETER (WFMOS) Executive Summary The Wide Field Fiber-Fed Optical Multi-Object Spectrometer (WFMOS) will become the premier tool for addressing two dominant themes in contemporary astrophysics: the nature of the dark energy (DE) responsible for the cosmic acceleration and the assembly history of galaxies such as M31 and our Milky Way. Coordinated galaxy surveys delivering spectroscopic redshifts for over 4 million galaxies will use baryonic acoustic oscillations and redshift-space distortions to bring a major advance in our understanding of dark energy; the potential for the first breakthrough in this area is high. Equally ambitious Galactic Archaeology (GA) stellar surveys will provide kinematic and chemical abundance data in order to identify and study the history and nature of galactic sub-components and their relation to dark matter halos surrounding galaxies. This proposal is the outcome of our detailed WFMOS concept study. We have revisited and rebalanced the scope and design of the DE and GA surveys compared to the earlier Feasibility Study. We have optimized the instrument for survey efficiency and flexibility. Our survey design is complementary to the HyperSuprimeCam imaging survey, which will utilize weak gravitational lensing to constrain the growth of structure. With input from Japanese colleagues, we have also examined a broader range of science applications ensuring our design is compatible with their requirements. In designing WFMOS, we have placed the greatest emphasis on survey efficiency and positioner reliability. Our prime-focus fiber positioning system comprises 2,400 actuated elements that fill a hexagonally-shaped 1.3 degree field of view. Piezo-electric motors rapidly translate rigidly-mounted fiber optic tips without any tilting over 9.5 mm overlapping patrol regions, minimizing exposure overheads. Acquisition/guide and metrology cameras ensure accurate placement and tracking with reference to a fixed set of fiducial fibers. High-throughput fiber connectors convey signals to 3 identical spectrographs on the third floor of the Subaru Observatory. Each spectrograph is of a fast Schmidt design and permits a variety of moveable gratings offering flexibility in spectral resolution and wavelength coverage. Thick deep-depletion silicon CCDs provide enhanced red sensitivity for our proposed surveys. Our team brings unique strengths to this ambitious project. The lead organization, JPL, is world-recognized in the delivery of complex astrophysical facilities; it offers impressive technical depth in its engineering and management expertise. The Caltech-based PI has over two decades of experience managing observatories and instrumentation at the 4–10 m class telescope scale. Our design team is drawn from a selection of institutes and individuals with excellent records in the design and delivery of innovative facility class instruments. Via the Thirty Meter Telescope project, Caltech and JPL have established strategically-important links with the Subaru community, which ensure this proposal has strong institutional support. The science team comprises highly productive world leaders in observational cosmology and galactic structure, each with valuable experience in survey design and implementation. Excellent relations have been established with Japanese astronomers involved in faint object spectroscopy and the HyperSuprimeCam project. Our cost for WFMOS is $58.3 M in real year dollars plus 20% reserves on the instrument for a total cost of $68.5 M. (These reserves are not applied to the Subaru provided elements and are separate from the Gemini contingency.) This proposal focuses on accurate cost estimates, a clear rationale for the level of reserves, and early identification of potential risks. The management approach in delivering a complex instrument at cost with an international partnership draws on practices developed over JPL’s history in the development and build of science instruments. 1
<strong>SUMMARY</strong> REPORT WIDE FIELD FIBER-FED OPTICAL MULTI-OBJECT SPECTROMETER (WFMOS) This Study Summary encapsulates the results of our WFMOS concept study. We summarize the development of our science objectives and requirements, present the instrument design features, trades and performance estimates, and discuss the implementation plan and management and cost details for the construction phase. 2
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