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Article: The 6dF Galaxy Survey: Z≈ 0 measurements of the growth rate and σ 8
Title  The 6dF Galaxy Survey: Z≈ 0 measurements of the growth rate and σ 8 

Authors  
Keywords  Cosmological parameters Cosmology: observations Surveys Galaxies: statistics Largescale structure of Universe 
Issue Date  2012 
Citation  Monthly Notices of the Royal Astronomical Society, 2012, v. 423, n. 4, p. 34303444 How to Cite? 
Abstract  We present a detailed analysis of redshiftspace distortions in the twopoint correlation function of the 6dF Galaxy Survey (6dFGS). The Kband selected subsample which we employ in this study contains 81971 galaxies distributed over 17000degree 2 with an effective redshift z eff= 0.067. By modelling the 2D galaxy correlation function, , we measure the parameter combination f(z eff)σ 8(z eff) = 0.423 ± 0.055, where is the growth rate of cosmic structure and σ 8 is the rms of matter fluctuations in 8h 1Mpc spheres. Alternatively, by assuming standard gravity we can break the degeneracy between σ 8 and the galaxy bias parameter b. Combining our data with the Hubble constant prior from Riess et al., we measure σ 8= 0.76 ± 0.11 and Ω m= 0.250 ± 0.022, consistent with constraints from other galaxy surveys and the cosmic microwave background data from Wilkinson Microwave Anisotropy Probe 7 (WMAP7). Combining our measurement of fσ 8 with WMAP7 allows us to test the cosmic growth history and the relationship between matter and gravity on cosmic scales by constraining the growth index of density fluctuations, γ. Using only 6dFGS and WMAP7 data we find γ= 0.547 ± 0.088, consistent with the prediction of General Relativity. We note that because of the low effective redshift of the 6dFGS our measurement of the growth rate is independent of the fiducial cosmological model (AlcockPaczynski effect). We also show that our conclusions are not sensitive to the model adopted for nonlinear redshiftspace distortions. Using a Fisher matrix analysis we report predictions for constraints on fσ 8 for the Widefield Australian SKA Pathfinder telescope Lband Legacy Allsky Blind surveY (WALLABY) and the proposed Transforming Astronomical Imaging surveys through Polychromatic Analysis of Nebulae (TAIPAN) survey. The WALLABY survey will be able to measure fσ 8 with a precision of 410 percent, depending on the modelling of nonlinear structure formation. This is comparable to the predicted precision for the best redshift bins of the Baryon Oscillation Spectroscopic Survey, demonstrating that lowredshift surveys have a significant role to play in future tests of dark energy and modified gravity. © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS. 
Persistent Identifier  http://hdl.handle.net/10722/208940 
ISSN  2015 Impact Factor: 4.952 2015 SCImago Journal Rankings: 2.806 
DC Field  Value  Language 

dc.contributor.author  Beutler, Florian   
dc.contributor.author  Blake, Chris A.   
dc.contributor.author  Colless, Matthew   
dc.contributor.author  Jones, Daniel Heath   
dc.contributor.author  StaveleySmith, Lister   
dc.contributor.author  Poole, Gregory B.   
dc.contributor.author  Campbell, Lachlan A.   
dc.contributor.author  Parker, Quentin A.   
dc.contributor.author  Saunders, Will J.   
dc.contributor.author  Watson, Fred G.   
dc.date.accessioned  20150323T02:02:17Z   
dc.date.available  20150323T02:02:17Z   
dc.date.issued  2012   
dc.identifier.citation  Monthly Notices of the Royal Astronomical Society, 2012, v. 423, n. 4, p. 34303444   
dc.identifier.issn  00358711   
dc.identifier.uri  http://hdl.handle.net/10722/208940   
dc.description.abstract  We present a detailed analysis of redshiftspace distortions in the twopoint correlation function of the 6dF Galaxy Survey (6dFGS). The Kband selected subsample which we employ in this study contains 81971 galaxies distributed over 17000degree 2 with an effective redshift z eff= 0.067. By modelling the 2D galaxy correlation function, , we measure the parameter combination f(z eff)σ 8(z eff) = 0.423 ± 0.055, where is the growth rate of cosmic structure and σ 8 is the rms of matter fluctuations in 8h 1Mpc spheres. Alternatively, by assuming standard gravity we can break the degeneracy between σ 8 and the galaxy bias parameter b. Combining our data with the Hubble constant prior from Riess et al., we measure σ 8= 0.76 ± 0.11 and Ω m= 0.250 ± 0.022, consistent with constraints from other galaxy surveys and the cosmic microwave background data from Wilkinson Microwave Anisotropy Probe 7 (WMAP7). Combining our measurement of fσ 8 with WMAP7 allows us to test the cosmic growth history and the relationship between matter and gravity on cosmic scales by constraining the growth index of density fluctuations, γ. Using only 6dFGS and WMAP7 data we find γ= 0.547 ± 0.088, consistent with the prediction of General Relativity. We note that because of the low effective redshift of the 6dFGS our measurement of the growth rate is independent of the fiducial cosmological model (AlcockPaczynski effect). We also show that our conclusions are not sensitive to the model adopted for nonlinear redshiftspace distortions. Using a Fisher matrix analysis we report predictions for constraints on fσ 8 for the Widefield Australian SKA Pathfinder telescope Lband Legacy Allsky Blind surveY (WALLABY) and the proposed Transforming Astronomical Imaging surveys through Polychromatic Analysis of Nebulae (TAIPAN) survey. The WALLABY survey will be able to measure fσ 8 with a precision of 410 percent, depending on the modelling of nonlinear structure formation. This is comparable to the predicted precision for the best redshift bins of the Baryon Oscillation Spectroscopic Survey, demonstrating that lowredshift surveys have a significant role to play in future tests of dark energy and modified gravity. © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS.   
dc.language  eng   
dc.relation.ispartof  Monthly Notices of the Royal Astronomical Society   
dc.subject  Cosmological parameters   
dc.subject  Cosmology: observations   
dc.subject  Surveys   
dc.subject  Galaxies: statistics   
dc.subject  Largescale structure of Universe   
dc.title  The 6dF Galaxy Survey: Z≈ 0 measurements of the growth rate and σ 8   
dc.type  Article   
dc.description.nature  link_to_subscribed_fulltext   
dc.identifier.doi  10.1111/j.13652966.2012.21136.x   
dc.identifier.scopus  eid_2s2.084863630347   
dc.identifier.volume  423   
dc.identifier.issue  4   
dc.identifier.spage  3430   
dc.identifier.epage  3444   
dc.identifier.eissn  13652966   