A measurement of the cosmological mass density from clustering in the 2dF Galaxy Redshift Survey

2001/03/01 by J. A. Peacock, S. Cole, Shaun Cole +46 · 33 citations
Physics and Astronomy · #Anisotropy #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Cosmic microwave background #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #Galaxy #Galaxy formation and evolution #Physics #Redshift #Redshift survey #Universe #astro-ph

paper · pdf · doi:10.1038/35065528

published as Nature 410:169-173,2001 · Nature 410, 169-173 (2001)

openalex publication_date 2001/03/01 · arxiv created 2001/03/09 · arxiv updated 2011/03/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06

Abstract

The large-scale structure in the distribution of galaxies is thought to arise from the gravitational instability of small fluctuations in the initial density field of the universe. A key test of this hypothesis is that superclusters of galaxies in the process of formation should generate systematic infall of other galaxies. This would be evident in the pattern of recessional velocities, causing an anisotropy in the inferred spatial clustering of galaxies. Here we report a precise measurement of this clustering, using the redshifts of more than 141,000 galaxies from the two-degree-field galaxy redshift survey. We determine the parameter beta = Omega^0.6/b = 0.43 +- 0.07, where Omega is the total mass-density parameter and b is a measure of the `bias' of the luminous galaxies in the survey. Combined with the anisotropy of the cosmic microwave background, our results favour a low-density universe with Omega approximately 0.3.

Citations

• Power Spectrum Correlations Induced by Nonlinear Clustering
• Application of Data Compression Methods to the Redshift-space distortions of the PSCz galaxy catalogue
• The nature of galaxy bias and clustering
• Reconstructing Nonlinear Stochastic Bias from Velocity Space Distortions
• A million cubic megaparsec void in Bootes
• Spatial Correlation Function and Pairwise Velocity Dispersion of Galaxies: Cold Dark Matter Models versus the Las Campanas Survey
• Final Results from theHubble Space TelescopeKey Project to Measure the Hubble Constant
• A survey of galaxy redshifts. V - The two-point position and velocity correlations
• The 2dF Galaxy Redshift Survey: spectral types and luminosity functions

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