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The Subaru FMOS galaxy redshift survey (FastSound). I. Overview of the survey targeting Hα emitters at z ˜ 1.4

Tonegawa, M.; Totani, T.; Okada, H.; Akiyama, M.; Dalton, G.; Glazebrook, K.; Iwamuro, F.; Maihara, T.; Ohta, K.; Shimizu, I.; Takato, N.; Tamura, N.; Yabe, K.; Bunker, A.J.; Coupon, J.; Ferreira, P.G.; Frenk, C.S.; Goto, T.; Hikage, C.; Ishikawa, T.; Matsubara, T.; More, S.; Okumura, T.; Percival, W.J.; Spitler, L.R.; Szapudi, I.

The Subaru FMOS galaxy redshift survey (FastSound). I. Overview of the survey targeting Hα emitters at z ˜ 1.4 Thumbnail


M. Tonegawa

T. Totani

H. Okada

M. Akiyama

G. Dalton

K. Glazebrook

F. Iwamuro

T. Maihara

K. Ohta

I. Shimizu

N. Takato

N. Tamura

K. Yabe

A.J. Bunker

J. Coupon

P.G. Ferreira

T. Goto

C. Hikage

T. Ishikawa

T. Matsubara

S. More

T. Okumura

W.J. Percival

L.R. Spitler

I. Szapudi


FastSound is a galaxy redshift survey that uses the near-infrared Fiber Multi-Object Spectrograph (FMOS) mounted on the Subaru Telescope, targeting Hα emitters at z ∼ 1.18–1.54 down to the sensitivity limit of Hα flux ∼ 2 × 10−16 erg cm−2 s−1. The primary goal of the survey is to detect redshift space distortion (RSD), to test the general theory of relativity by measuring the growth rate of large-scale structure and to constrain modified gravity models for the origin of the accelerated expansion of the universe. The target galaxies were selected based on photometric redshifts and Hα flux estimates calculated by fitting spectral energy distribution (SED) models to the five optical magnitudes of the Canada–France–Hawaii Telescope Legacy Survey (CFHTLS) Wide catalog. The survey started in 2012 March, and all the observations were completed in 2014 July. In total, we achieved 121 pointings of FMOS (each pointing has a 30′ diameter circular footprint) covering 20.6 deg2 by tiling the four fields of the CFHTLS Wide in a hexagonal pattern. Emission lines were detected from ∼ 4000 star-forming galaxies by an automatic line detection algorithm applied to 2D spectral images. This is the first in a series of papers based on FastSound data, and we describe the details of the survey design, target selection, observations, data reduction, and emission line detections.


Tonegawa, M., Totani, T., Okada, H., Akiyama, M., Dalton, G., Glazebrook, K., …Szapudi, I. (2015). The Subaru FMOS galaxy redshift survey (FastSound). I. Overview of the survey targeting Hα emitters at z ˜ 1.4. Publications of Astronomical Society of Japan, 67(5), Article 81.

Journal Article Type Article
Publication Date Oct 1, 2015
Deposit Date Feb 23, 2016
Publicly Available Date Jun 23, 2016
Journal Publications of Astronomical Society of Japan
Print ISSN 0004-6264
Electronic ISSN 2053-051X
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 67
Issue 5
Article Number 81


Accepted Journal Article (3.4 Mb)

Copyright Statement
This is a pre-copyedited, author-produced PDF of an article accepted for publication in Publications of the Astronomical Society of Japan following peer review. The version of record Tonegawa, M. and Totani, T. and Okada, H. and Akiyama, M. and Dalton, G. and Glazebrook, K. and Iwamuro, F. and Maihara, T. and Ohta, K. and Shimizu, I. and Takato, N. and Tamura, N. and Yabe, K. and Bunker, A.J. and Coupon, J. and Ferreira, P.G. and Frenk, C.S. and Goto, T. and Hikage, C. and Ishikawa, T. and Matsubara, T. and More, S. and Okumura, T. and Percival, W.J. and Spitler, L.R. and Szapudi, I. (2015) 'The Subaru FMOS galaxy redshift survey (FastSound). I : overview of the survey targeting Hα emitters at z ˜ 1.4.', Publications of the Astronomical Society of Japan., 67 (5). p. 81 available online at:

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