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

John A. Peacock (), Shaun Cole, Peder Norberg, Carlton M. Baugh, Joss Bland-Hawthorn, Terry Bridges, Russell D. Cannon, Matthew Colless, Chris Collins, Warrick Couch, Gavin Dalton, Kathryn Deeley, Roberto De Propris, Simon P. Driver, George Efstathiou, Richard S. Ellis, Carlos S. Frenk, Karl Glazebrook, Carole Jackson, Ofer Lahav, Ian Lewis, Stuart Lumsden, Steve Maddox, Will J. Percival, Bruce A. Peterson, Ian Price, Will Sutherland and Keith Taylor
Additional contact information
John A. Peacock: Institute for Astronomy, University of Edinburgh, Royal Observatory
Shaun Cole: University of Durham
Peder Norberg: University of Durham
Carlton M. Baugh: University of Durham
Joss Bland-Hawthorn: Anglo-Australian Observatory
Terry Bridges: Anglo-Australian Observatory
Russell D. Cannon: Anglo-Australian Observatory
Matthew Colless: Research School of Astronomy & Astrophysics, The Australian National University
Chris Collins: Astrophysics Research Institute, Liverpool John Moores University,
Warrick Couch: University of New South Wales
Gavin Dalton: University of Oxford
Kathryn Deeley: University of New South Wales
Roberto De Propris: University of New South Wales
Simon P. Driver: School of Physics and Astronomy, University of St Andrews
George Efstathiou: Institute of Astronomy, University of Cambridge
Richard S. Ellis: Institute of Astronomy, University of Cambridge
Carlos S. Frenk: University of Durham
Karl Glazebrook: Johns Hopkins University
Carole Jackson: Research School of Astronomy & Astrophysics, The Australian National University
Ofer Lahav: Institute of Astronomy, University of Cambridge
Ian Lewis: Anglo-Australian Observatory
Stuart Lumsden: University of Leeds
Steve Maddox: School of Physics & Astronomy, University of Nottingham
Will J. Percival: Institute for Astronomy, University of Edinburgh, Royal Observatory
Bruce A. Peterson: Research School of Astronomy & Astrophysics, The Australian National University
Ian Price: Research School of Astronomy & Astrophysics, The Australian National University
Will Sutherland: Institute for Astronomy, University of Edinburgh, Royal Observatory
Keith Taylor: Anglo-Australian Observatory

Nature, 2001, vol. 410, issue 6825, 169-173

Abstract: 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 forming superclusters of galaxies should generate a 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 (2dF) galaxy redshift survey. We determine the parameter β = Ω0.6/b = 0.43 ± 0.07, where Ω is the total mass-density parameter of the Universe and b is a measure of the ‘bias’ of the luminous galaxies in the survey. (Bias is the difference between the clustering of visible galaxies and of the total mass, most of which is dark.) Combined with the anisotropy of the cosmic microwave background, our results favour a low-density Universe with Ω ≈ 0.3.

Date: 2001
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DOI: 10.1038/35065528

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