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Prime Focus Spectrograph for the Subaru telescope: massively multiplexed optical and near-infrared fiber spectrograph

Sugai, H.; Tamura, N.; Karoji, H.; Shimono, A.; Takato, N.; Kimura, M.; Ohyama, Y.; Ueda, A.; Aghazarian, H.; de Arruda, M.V.; Barkhouser, R.H.; Bennett, C.L.; Bickerton, S.; Bozier, A.; Braun, D.F.; Bui, K.; Capocasale, C.M.; Carr, M.A.; Castilho, B.; Chang, Y.-C.; Chen, H.-Y.; Chou, R.C.Y.; Dawson, O.R.; Dekany, R.G.; Ek, E.M.; Ellis, R.S.; English, R.J.; Ferrand, D.; Ferreira, D.; Fisher, C.D.; Golebiowski, M.; Gunn, J.E.; Hart, M.; Heckman, T.M.; Ho, P.T.P.; Hope, S.; Hovland, L.E.; Hsu, S.-F.; Hu, Y.-S.; Huang, P.J.; Jaquet, M.; Karr, J.E.; Kempenaar, J.G.; King, M.E.; Fèvre, O.L.; Mignant, D.L.; Ling, H.-H.; Loomis, C.; Lupton, R.H.; Madec, F.; Mao, P.; Marrara, L.S.; Ménard, B.; Morantz, C.; Murayama, H.; Murray, G.J.; de Oliveira, A.C.; de Oliveira, C.M.; de Oliveira, L.S.; Orndorff, J.D.; de Paiva Vilac ca, R.; Partos, E.J.; Pascal, S.; Pegot-Ogier, T.; Reiley, D.J.; Riddle, R.; Santos, L.; dos Santos, J.B.; Schwochert, M.A.; Seiffert, M.D.; Smee, S.A.; Smith, R.M.; Steinkraus...

Prime Focus Spectrograph for the Subaru telescope: massively multiplexed optical and near-infrared fiber spectrograph Thumbnail


H. Sugai

N. Tamura

H. Karoji

A. Shimono

N. Takato

M. Kimura

Y. Ohyama

A. Ueda

H. Aghazarian

M.V. de Arruda

R.H. Barkhouser

C.L. Bennett

S. Bickerton

A. Bozier

D.F. Braun

K. Bui

C.M. Capocasale

M.A. Carr

B. Castilho

Y.-C. Chang

H.-Y. Chen

R.C.Y. Chou

O.R. Dawson

R.G. Dekany

E.M. Ek

R.S. Ellis

R.J. English

D. Ferrand

D. Ferreira

C.D. Fisher

M. Golebiowski

J.E. Gunn

M. Hart

T.M. Heckman

P.T.P. Ho

S. Hope

L.E. Hovland

S.-F. Hsu

Y.-S. Hu

P.J. Huang

M. Jaquet

J.E. Karr

J.G. Kempenaar

M.E. King

O.L. Fèvre

D.L. Mignant

H.-H. Ling

C. Loomis

R.H. Lupton

F. Madec

P. Mao

L.S. Marrara

B. Ménard

C. Morantz

H. Murayama

A.C. de Oliveira

C.M. de Oliveira

L.S. de Oliveira

J.D. Orndorff

R. de Paiva Vilac ca

E.J. Partos

S. Pascal

T. Pegot-Ogier

D.J. Reiley

R. Riddle

L. Santos

J.B. dos Santos

M.A. Schwochert

M.D. Seiffert

S.A. Smee

R.M. Smith

R.E. Steinkraus

L. Sodré

D.N. Spergel

C. Surace

L. Tresse

C. Vidal

S. Vives

S.-Y. Wang

C.-Y. Wen

A.C. Wu

R. Wyse

C.-H. Yan


he Prime Focus Spectrograph (PFS) is an optical/near-infrared multifiber spectrograph with 2394 science fibers distributed across a 1.3-deg diameter field of view at the Subaru 8.2-m telescope. The wide wavelength coverage from 0.38  μm0.38  μm to 1.26  μm1.26  μm, with a resolving power of 3000, simultaneously strengthens its ability to target three main survey programs: cosmology, galactic archaeology and galaxy/AGN evolution. A medium resolution mode with a resolving power of 5000 for 0.71  μm0.71  μm to 0.89  μm0.89  μm will also be available by simply exchanging dispersers. We highlight some of the technological aspects of the design. To transform the telescope focal ratio, a broad-band coated microlens is glued to each fiber tip. A higher transmission fiber is selected for the longest part of the cable system, optimizing overall throughput; a fiber with low focal ratio degradation is selected for the fiber-positioner and fiber-slit components, minimizing the effects of fiber movements and fiber bending. Fiber positioning will be performed by a positioner consisting of two stages of piezo-electric rotary motors. The positions of these motors are measured by taking an image of artificially back-illuminated fibers with the metrology camera located in the Cassegrain container; the fibers are placed in the proper location by iteratively measuring and then adjusting the positions of the motors. Target light reaches one of the four identical fast-Schmidt spectrograph modules, each with three arms. The PFS project has passed several project-wide design reviews and is now in the construction phase.


Sugai, H., Tamura, N., Karoji, H., Shimono, A., Takato, N., Kimura, M., …Yan, C. (2015). Prime Focus Spectrograph for the Subaru telescope: massively multiplexed optical and near-infrared fiber spectrograph. Journal of Astronomical Telescopes, Instruments, and Systems, 1(3), Article 035001.

Journal Article Type Article
Acceptance Date May 22, 2015
Online Publication Date Jun 23, 2015
Publication Date Jun 23, 2015
Deposit Date Mar 22, 2016
Publicly Available Date Jun 21, 2016
Journal Journal of Astronomical Telescopes, Instruments, and Systems
Electronic ISSN 2329-4221
Publisher Society of Photo-optical Instrumentation Engineers
Peer Reviewed Peer Reviewed
Volume 1
Issue 3
Article Number 035001
Related Public URLs


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Copyright Statement
© The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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