The 2dF Galaxy Redshift Survey: the power spectrum and the matter content of the Universe

W J Percival, C M Baugh, J Bland-Hawthorn, T Bridges, R Cannon, S Cole, M Colless, C Collins, W Couch, G Dalton, R De Propris, S P Driver, G Efstathiou, R S Ellis, C S Frenk, K Glazebrook, C Jackson, O Lahav, I Lewis, S LumsdenS Maddox, S Moody, P Norberg, J A Peacock, B A Peterson, W Sutherland, K Taylor

Research output: Contribution to journalArticlepeer-review

671 Citations (Scopus)

Abstract

The 2dF Galaxy Redshift Survey has now measured in excess of 160 000 galaxy redshifts. This paper presents the power spectrum of the galaxy distribution, calculated using a direct Fourier transform based technique. We argue that, within the k-space region 0.02 less than or similar to k less than or similar to 0.15 h Mpc(-1), the shape of this spectrum should be close to that of the linear density perturbations convolved with the window function of the survey. This window function and its convolving effect on the power spectrum estimate are analysed in detail. By convolving model spectra, we are able to fit the power-spectrum data and provide a measure of the matter content of the Universe. Our results show that models containing baryon oscillations are mildly preferred over featureless power spectra. Analysis of the data yields 68 per cent confidence limits on the total matter density times the Hubble parameter Omega (m) h = 0.20 +/- 0.03, and the baryon fraction Omega (b)/Omega (m) = 0.15 +/- 0.07, assuming scale-invariant primordial fluctuations.

Original languageEnglish
Pages (from-to)1297-1306
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume327
Publication statusPublished - 11 Nov 2001

Keywords

  • cosmological parameters
  • large-scale structure of Universe
  • ANGULAR-CORRELATION FUNCTION

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