We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
The Subaru FMOS galaxy redshift survey (FastSound). IV. New constraint on gravity theory from redshift space distortions at z ~ 1.4.
- Authors
Teppei OKUMURA; Chiaki HIKAGE; Tomonori TOTANI; Motonari TONEGAWA; Hiroyuki OKADA; GLAZEBROOK, Karl; BLAKE, Chris; FERREIRA, Pedro G.; Surhud MORE; Atsushi TARUYA; Shinji TSUJIKAWA; Masayuki AKIYAMA; DALTON, Gavin; Tomotsugu GOTO; Takashi ISHIKAWA; Fumihide IWAMURO; Takahiko MATSUBARA; Takahiro NISHIMICHI; Kouji OHTA; Ikkoh SHIMIZU
- Abstract
We measure the redshift-space correlation function from a spectroscopic sample of 2783 emission line galaxies from the FastSound survey. The survey, which uses the Subaru Telescope and covers a redshift range of 1.19 < z < 1.55, is the first cosmological study at such high redshifts. We detect clear anisotropy due to redshift-space distortions (RSD) both in the correlation function as a function of separations parallel and perpendicular to the line of sight and its quadrupole moment. RSD has been extensively used to test general relativity on cosmological scales at z < 1. Adopting a ~CDM cosmology with the fixed expansion history and no velocity dispersion (σv = 0), and using the RSD measurements on scales above 8 h-1 Mpc, we obtain the first constraint on the growth rate at the redshift, f(z)σ8(z) = 0.482 ± 0.116 at z ~ 1.4 after marginalizing over the galaxy bias parameter b(z)σ8(z). This corresponds to 4.2 σ detection of RSD. Our constraint is consistent with the prediction of general relativity fσ8 ~ 0.392 within the 1 σ confidence level. When we allow σv to vary and marginalize over it, the growth rate constraint becomes fσ8 = 0.494+0.126-0.120. We also demonstrate that by combining with the low-z constraints on fσ8, high-z galaxy surveys like the FastSound can be useful to distinguish modified gravity models without relying on CMB anisotropy experiments.
- Subjects
METAPHYSICAL cosmology; COSMOLOGICAL distances; GALACTIC redshift; GALACTIC dynamics
- Publication
Publications of the Astronomical Society of Japan, 2016, Vol 68, Issue 3, p1
- ISSN
0004-6264
- Publication type
Article
- DOI
10.1093/pasj/psw029