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

Clicks: 2
ID: 291177
2005
Free PDF
Article Quality & Performance Metrics
Overall Quality
Not rated
Combines reader engagement with the AI quality analysis. This article has not been analysed, so there is no overall score — reader engagement is measured and shown alongside.
AI Quality Assessment
Not analyzed
Readership in this journal
Steady

Ranked #528 of 908 articles by views in monthly notices of the royal astronomical society

Most read Least read

Bar heights use a square-root scale. Only the 120 most-read articles are drawn; the journal has 908 in total.

Mint this article as an NFT
Not yet minted

Create a permanent, verifiable on-chain record of this article on the Scimatic Network. The NFT is held in your Journament account, and you can withdraw it to your own wallet at any time.

5 SUSD one-off · no wallet required
Sign in to mint
Abstract
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 ns= 1 spectrum, h= 0.72 and negligible neutrino mass, the preferred parameters are Ωmh= 0.168 ± 0.016 and a baryon fraction Ωb/Ωm= 0.185 ± 0.046 (1σ errors). The value of Ωmh 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 Ωm= 0.3: in combination with cosmic microwave background (CMB) data from the Wilkinson Microwave Anisotropy Probe (WMAP), we infer Ωm= 0.231 ± 0.021.
Reference Key
openalex_W2143513913 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Shaun Cole, W. J. Percival, J. A. Peacock, P. Norberg, C. M. Baugh, Carlos S. Frenk, I. K. Baldry, Joss Bland‐Hawthorn, Terry Bridges, Russell Cannon, Matthew Colless, C. A. Collins, W. J. Couch, N. J. G. Cross, Gavin Dalton, V. R. Eke, R. De Pietri, Simon P. Driver, G. Efstathiou, Richard S. Ellis, Karl Glazebrook, Carole Jackson, Adrian Jenkins, O. Lahav, Ian Lewis, S. L. Lumsden, S. Maddox, Darren S. Madgwick, B. A. Peterson, William J. Sutherland, Keith Taylor
Journal monthly notices of the royal astronomical society
Year 2005
DOI
10.1111/j.1365-2966.2005.09318.x
URL
https://academic.oup.com/mnras/article-pdf/362/2/505/6155670/362-2-505.pdf
Keywords Keywords not found

Citations

No citations found. To add a citation, contact the admin at info@scimatic.org

Comments

No comments yet. Be the first to comment on this article.