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

2001/05/15 by Will J. Percival, Carlton M. Baugh, C. M. Baugh +40 · 840 citations
Physics and Astronomy · #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Baryon #Baryon acoustic oscillations #Galaxies: Formation, Evolution, Phenomena #Galaxy #Matter power spectrum #Observational cosmology #Physics #Redshift #Redshift survey #Spectral density #Statistics #Stellar, planetary, and galactic studies #Universe #Window function #astro-ph

paper · pdf · doi:10.1046/j.1365-8711.2001.04827.x

published in Monthly Notices of the Royal Astronomical Society 327(4), 1297-1306 (Oxford University Press) · 10 pages, 8 figures, submitted to MNRAS

arxiv created 2001/05/15 · openalex publication_date 2001/11/11 · arxiv updated 2011/03/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

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 , 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 , and the baryon fraction , assuming scale-invariant primordial fluctuations.

Citations

• The Deuterium to Hydrogen Abundance Ratio toward a Fourth QSO: HS 0105+1619
• Power Spectrum Correlations Induced by Nonlinear Clustering
• A measurement of the cosmological mass density from clustering in the 2dF Galaxy Redshift Survey
• Final Results from theHubble Space TelescopeKey Project to Measure the Hubble Constant
• The nature of galaxy bias and clustering

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