Extragalactic science, cosmology, and Galactic archaeology with the Subaru Prime Focus Spectrograph

Masahiro Takada, Richard S. Ellis, Masashi Chiba, Jenny E. Greene, Hiroaki Aihara, Nobuo Arimoto, Kevin Bundy, Judith Cohen, Olivier Doré, Genevieve Graves, James E. Gunn, Timothy Heckman, Christopher M. Hirata, Paul Ho, Jean Paul Kneib, Olivier Le Fèvre, Lihwai Lin, Surhud More, Hitoshi Murayama, Tohru NagaoMasami Ouchi, Michael Seiffert, John D. Silverman, Laerte Sodré, David N. Spergel, Michael A. Strauss, Hajime Sugai, Yasushi Suto, Hideki Takami, Rosemary Wyse

Research output: Contribution to journalReview articlepeer-review

486 Scopus citations


The Subaru Prime Focus Spectrograph (PFS) is a massively multiplexed fiber-fed optical and near-infrared three-arm spectrograph (Nfiber= 2400, 380 ≤ λ ≤ 1260 nm, 13 diameter field of view). Here, we summarize the science cases in terms of provisional plans for a 300-night Subaru survey. We describe plans to constrain the nature of dark energy via a survey of emission line galaxies spanning a comoving volume of 9.3 h-3Gpc3in the redshift range 0.8 < z < 2.4. In each of six redshift bins, the cosmological distances will be measured to 3% precision via the baryonic acoustic oscillation scale, and redshift-space distortion measures will constrain structure growth to 6% precision. In the near-field cosmology program, radial velocities and chemical abundances of stars in the Milky Way and M 31 will be used to infer the past assembly histories of spiral galaxies and the structure of their dark matter halos. Data will be secured for 106stars in the Galactic thick-disk, halo, and tidal streams as faint as V ∼ 22, including stars with V < 20 to complement the goals of the Gaia mission. A medium-resolution mode with R = 5000 to be implemented in the red arm will allow the measurement of multiple α-element abundances and more precise velocities for Galactic stars. For the galaxy evolution program, our simulations suggest the wide wavelength range of PFS will be powerful in probing the galaxy population and its clustering over a wide redshift range. We plan to conduct a color-selected survey of 1 < z < 2 galaxies and AGN over 16 deg2to J ≃ 23.4, yielding a fair sample of galaxies with stellar masses above ∼1010Mȯat z ≃ 2. A two-tiered survey of higher redshift Lyman break galaxies and Lyman alpha emitters will quantify the properties of early systems close to the reionization epoch.

Original languageEnglish (US)
Article numberR1
JournalPublications of the Astronomical Society of Japan
Issue number1
StatePublished - Feb 1 2014

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • cosmology: dark energy
  • cosmology: large-scale structure of Universe
  • galaxies: formation
  • galaxies: kinematics and dynamics
  • instrumentation: spectographs


Dive into the research topics of 'Extragalactic science, cosmology, and Galactic archaeology with the Subaru Prime Focus Spectrograph'. Together they form a unique fingerprint.

Cite this