Prime focus spectrograph: Subaru's future

摘要

The Prime Focus Spectrograph (PFS) of the Subaru Measurement of Images and Redshifts (SuMIRe) project has beenendorsed by Japanese community as one of the main future instruments of the Subaru 8.2-meter telescope at Mauna Kea,Hawaii. This optical/near-infrared multi-fiber spectrograph targets cosmology with galaxy surveys, Galactic archaeology,and studies of galaxy/AGN evolution.Taking advantage of Subaru’s wide field of view, which is further extended with the recently completed Wide FieldCorrector, PFS will enable us to carry out multi-fiber spectroscopy of 2400 targets within 1.3 degree diameter. Amicrolens is attached at each fiber entrance for F-ratio transformation into a larger one so that difficulties of spectrograph design are eased. Fibers are accurately placed onto target positions by positioners, each of which consists of two stagesof piezo-electric rotary motors, through iterations by using back-illuminated fiber position measurements with a widefieldmetrology camera. Fibers then carry light to a set of four identical fast-Schmidt spectrographs with three color armseach: the wavelength ranges from 0.38 μm to 1.3 μm will be simultaneously observed with an average resolving powerof 3000.Before and during the era of extremely large telescopes, PFS will provide the unique capability of obtaining spectra of2400 cosmological/astrophysical targets simultaneously with an 8-10 meter class telescope. The PFS collaboration, ledby IPMU, consists of USP/LNA in Brazil, Caltech/JPL, Princeton, and JHU in USA, LAM in France, ASIAA in Taiwan,and NAOJ/Subaru.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.