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Studying large-scale structure with the 2dF Galaxy Redshift Survey | | J.A. Peacock
; M. Colless
; I. Baldry
; C. Baugh
; J. Bland-Hawthorn
; T.J. Bridges
; R. Cannon
; S. Cole
; C.A. Collins
; W. Couch
; G.B. Dalton
; R. De Propris
; S.P. Driver
; G. Efstathiou
; R.S. Ellis
; C.S. Frenk
; K. Glazebrook
; C.A. Jackson
; O. Lahav
; I.J. Lewis
; S. Lumsden
; S.J. Maddox
; D. Madgwick
; P. Norberg
; W. Percival
; B.A. Peterson
; W.J. Sutherland
; K. Taylor.
; | | Date: |
15 Apr 2002 | | Subject: | astro-ph | | Affiliation: | University of Edinburgh), M. Colless, I. Baldry, C. Baugh, J. Bland-Hawthorn, T.J. Bridges, R. Cannon, S. Cole, C.A. Collins, W. Couch, G.B. Dalton, R. De Propris, S.P. Driver, G. Efstathiou, R.S. Ellis, C.S. Frenk, K. Glazebrook, C.A. Jackson, O. Laha | | Abstract: | The 2dF Galaxy Redshift Survey is the first to observe more than 100,000 redshifts. This allows precise measurements of many of the key statistics of galaxy clustering, in particular redshift-space distortions and the large-scale power spectrum. This paper presents the current 2dFGRS results in these areas. Redshift-space distortions are detected with a high degree of significance, confirming the detailed Kaiser distortion from large-scale infall velocities, and measuring the distortion parameter beta equiv Omega_m^{0.6}/b = 0.43 +- 0.07. The power spectrum is measured to < 10% accuracy for k > 0.02 h Mpc^{-1}, and is well fitted by a CDM model with Omega_m h = 0.20 +- 0.03 and a baryon fraction of 0.15 +- 0.07. A joint analysis with CMB data requires Omega_m = 0.29 +- 0.05, assuming scalar fluctuations, but no priors on other parameters. Two methods are used to determine the large-scale bias parameter: an internal bispectrum analysis yields b = 1.04 +- 0.11, in very good agreement with the b = 1.10 +- 0.08 obtained from a joint 2dFGRS+CMB analysis, again assuming scalar fluctuations. These figures refer to galaxies of approximate luminosity 2L^*; luminosity dependence of clustering is detected at high significance, and is well described by b/b^* = 0.85 + 0.15(L/L^*). | | Source: | arXiv, astro-ph/0204239 | | Services: | Forum | Review | PDF | Favorites | |
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