The 6dF Galaxy Survey: z \approx 0 measurement of the growth rate and sigma_8

By F. Beutler, C. Blake, M. Colless, D. Jones, L. Staveley-Smith, Gregory B. Poole, L. Campbell, Quentin A. Parker, Will J. Saunders, F. Watson. 2012

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We present a detailed analysis of redshift-space distortions in the two-point correlation function of the 6dF Galaxy Survey (6dFGS). The K-band selected sub-sample which we employ in this study contains 81971 galaxies distributed over 17000deg^2 with an effective redshift z = 0.067. By modelling the 2D galaxy correlation function, xi(r_p,pi), we measure the parameter combination f(z)sigma_8(z) = 0.423 +/- 0.055. Alternatively, by assuming standard gravity we can break the degeneracy between sigma_8 and the galaxy bias parameter, b. Combining our data with the Hubble constant prior from Riess et al (2011), we measure sigma_8 = 0.76 +/- 0.11 and Omega_m = 0.250 +/- 0.022, consistent with constraints from other galaxy surveys and the Cosmic Microwave Background data from WMAP7. Combining our measurement of fsigma_8 with WMAP7 allows us to test the relationship between matter and gravity on cosmic scales by constraining the growth index of density fluctuations, gamma. Using only 6dFGS and WMAP7 data we find gamma = 0.547 +/- 0.088, consistent with the prediction of General Relativity. We note that because of the low effective redshift of 6dFGS our measurement of the growth rate is independent of the fiducial cosmological model (Alcock-Paczynski effect). We also show that our conclusions are not sensitive to the model adopted for non-linear redshift-space distortions. Using a Fisher matrix analysis we report predictions for constraints on fsigma_8 for the WALLABY survey and the proposed TAIPAN survey. The WALLABY survey will be able to measure fsigma_8 with a precision of 4-10%, depending on the modelling of non-linear structure formation. This is comparable to the predicted precision for the best redshift bins of the Baryon Oscillation Spectroscopic Survey (BOSS), demonstrating that low-redshift surveys have a significant role to play in future tests of dark energy and modified gravity.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/5c2099ee50fd7f323b3f4744fa590e1fff292f1e

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Citations in the corpus

The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: single-probe measurements from CMASS anisotropic galaxy clustering (2013, methodology): “…data (Planck) with our measurement (red square), and other measurements (black circles and blue triangles; Percival et al. 2010; Blake et al. 2011a; Beutler et al. 2012, 2014; Chuang & Wang 2012; Chuang et al. 2012; Padmanabhan et al. 2012; Anderson et al. 2013, 2014b; Samushia et al. 2014;…”
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The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: Measuring growth rate and geometry with anisotropic clustering (2013, methodology): “The RSD signal has been measured in the 6dFGRS (Beutler et al. 2012), the SDSS-II survey (Samushia, Percival & Raccanelli 2012), the SDSS-III BOSS DR9 data (Reid et al. 2012) and VIMOS Public Extragalactic Redshift Survey (VIPERS; de la Torre et al. 2013).”
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The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: Constraining modified gravity (2016, methodology): “In addition to the DR12 BOSS data, we use RSD measurements from three different surveys (see Table 1): the SixDegree Field Galaxy Survey (6dFGS, Beutler et al. 2012), the SDSS Data Release 7 Main Galaxy Sample (MGS, Howlett et al. 2015) and the VIMOS Public Extragalactic Redshift Survey (VIPERS, de…”
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Galaxy And Mass Assembly (GAMA): improved cosmic growth measurements using multiple tracers of large-scale structure (2013, methodology): “These measurements were taken from 6dFGS (z = 0.067; Beutler et al. 2012), 2dFGRS (z = 0.17; Hawkins et al. 2003), the SDSS Luminous Red Galaxy sample (z = 0.25 and 0.37; Samushia et al. 2012) and the WiggleZ Survey (z = 0.22 and 0.41; Blake et al. 2011).”
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CFHTLenS: testing the laws of gravity with tomographic weak lensing and redshift-space distortions (2012, methodology): “This effect has been observed with heightened precision over the past decade (Peacock et al. 2001; Hawkins et al. 2003; Guzzo et al. 2008; Blake et al. 2011; Beutler et al. 2012; Reid et al. 2012) permitting inferences of the rate at which cosmological structure forms.”
The VIMOS Public Extragalactic Redshift Survey (VIPERS) - Galaxy clustering and redshift-space distortions at z ≃ 0.8 in the first data release (2013, methodology): “…previous measurements at lower redshifts from 2dFGRS (Hawkins et al. 2003), 2SLAQ (Ross et al. 2007), VVDS (Guzzo et al. 2008), SDSS LRG (Cabré & Gaztañaga 2009; Samushia et al. 2012), WiggleZ (Blake et al. 2012), BOSS (Reid et al. 2012), and 6dFGS (Beutler et al. 2012) surveys as shown in Fig.”
The Subaru FMOS galaxy redshift survey (FastSound). IV. New constraint on gravity theory from redshift space distortions at z ∼ 1.4 (2015, background): “These constraints include the studies of the 6dFGS (Beutler et al. 2012), the SDSS main galaxies (Howlett et al. 2015), the 2dFGRS (Song & Percival 2009), the SDSS LRG (Samushia et al. 2012), the BOSS LOWZ (Chuang et al. 2013), the BOSS CMASS (Reid et al. 2012), WiggleZ (Blake et al. 2011), VVDS…”