A Caltech Library Service

The 2dF Galaxy Redshift Survey: power-spectrum analysis of the final data set and cosmological implications

Cole, Shaun and Percival, Will J. and Peacock, John A. and Norberg, Peder and Baugh, Carlton M. and Frenk, Carlos S. and Baldry, Ivan and Bland-Hawthorn, Joss and Bridges, Terry and Cannon, Russell and Colless, Matthew and Collins, Chris and Couch, Warrick and Cross, Nicholas J. G. and Dalton, Gavin and Eke, Vincent R. and De Propris, Roberto and Driver, Simon P. and Efstathiou, George and Ellis, Richard S. and Glazebrook, Karl and Jackson, Carole and Jenkins, Adrian and Lahav, Ofer and Lewis, Ian and Lumsden, Stuart and Maddox, Steve and Madgwick, Darren and Peterson, Bruce A. and Sutherland, Will and Taylor, Keith (2005) The 2dF Galaxy Redshift Survey: power-spectrum analysis of the final data set and cosmological implications. Monthly Notices of the Royal Astronomical Society, 362 (2). pp. 505-534. ISSN 0035-8711. doi:10.1111/j.1365-2966.2005.09318.x.

[img] PDF - Published Version
See Usage Policy.

[img] PDF - Accepted Version
See Usage Policy.


Use this Persistent URL to link to this item:


We present a power-spectrum analysis of the final 2dF Galaxy Redshift Survey (2dFGRS), employing a direct Fourier method. The sample used comprises 221 414 galaxies with measured redshifts. We investigate in detail the modelling of the sample selection, improving on previous treatments in a number of respects. A new angular mask is derived, based on revisions to the photometric calibration. The redshift selection function is determined by dividing the survey according to rest-frame colour, and deducing a self-consistent treatment of k-corrections and evolution for each population. The covariance matrix for the power-spectrum estimates is determined using two different approaches to the construction of mock surveys, which are used to demonstrate that the input cosmological model can be correctly recovered. We discuss in detail the possible differences between the galaxy and mass power spectra, and treat these using simulations, analytic models and a hybrid empirical approach. Based on these investigations, we are confident that the 2dFGRS power spectrum can be used to infer the matter content of the universe. On large scales, our estimated power spectrum shows evidence for the ‘baryon oscillations’ that are predicted in cold dark matter (CDM) models. Fitting to a CDM model, assuming a primordial n_s = 1 spectrum, h = 0.72 and negligible neutrino mass, the preferred parameters are Ω_mh = 0.168 ± 0.016 and a baryon fraction Ωb/Ω_m= 0.185 ± 0.046 (1σ errors). The value of Ω_mh is 1σ lower than the 0.20 ± 0.03 in our 2001 analysis of the partially complete 2dFGRS. This shift is largely due to the signal from the newly sampled regions of space, rather than the refinements in the treatment of observational selection. This analysis therefore implies a density significantly below the standard Ω_m = 0.3: in combination with cosmic microwave background (CMB) data from the Wilkinson Microwave Anisotropy Probe (WMAP), we infer Ω_m = 0.231 ± 0.021.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Norberg, Peder0000-0002-5875-0440
Baugh, Carlton M.0000-0002-9935-9755
Bland-Hawthorn, Joss0000-0001-7516-4016
Colless, Matthew0000-0001-9552-8075
Ellis, Richard S.0000-0001-7782-7071
Additional Information:© 2005 RAS. Accepted 2005 June 16. Received 2005 June 16; in original form 2005 January 10. The data used here were obtained with the 2° field facility on the 3.9-m Anglo-Australian Telescope (AAT). We thank all those involved in the smooth running and continued success of the 2dF and the AAT. We thank Valerie de Lapparent for kindly making available the ESO-Sculptor photometry. JAP and OL are grateful for the support of PPARC Senior Research Fellowships. PN acknowledges the receipt of an ETH Zwicky Prize Fellowship. We thank the anonymous referee for many useful comments.
Funding AgencyGrant Number
Particle Physics and Astronomy Research Council (PPARC)UNSPECIFIED
Subject Keywords:cosmological parameters, large-scale structure of Universe
Issue or Number:2
Record Number:CaltechAUTHORS:20200713-181756517
Persistent URL:
Official Citation:Shaun Cole, Will J. Percival, John A. Peacock, Peder Norberg, Carlton M. Baugh, Carlos S. Frenk, Ivan Baldry, Joss Bland-Hawthorn, Terry Bridges, Russell Cannon, Matthew Colless, Chris Collins, Warrick Couch, Nicholas J. G. Cross, Gavin Dalton, Vincent R. Eke, Roberto de Propris, Simon P. Driver, George Efstathiou, Richard S. Ellis, Karl Glazebrook, Carole Jackson, Adrian Jenkins, Ofer Lahav, Ian Lewis, Stuart Lumsden, Steve Maddox, Darren Madgwick, Bruce A. Peterson, Will Sutherland, Keith Taylor, The 2dFGRS Team, The 2dF Galaxy Redshift Survey: power-spectrum analysis of the final data set and cosmological implications, Monthly Notices of the Royal Astronomical Society, Volume 362, Issue 2, September 2005, Pages 505–534,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104370
Deposited By: Rebecca Minjarez
Deposited On:16 Jul 2020 16:16
Last Modified:16 Nov 2021 18:31

Repository Staff Only: item control page