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

Author

Listed:
  • 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
    Caltech)

  • 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
    University of Oxford)

  • Keith Taylor

    (Anglo-Australian Observatory
    Caltech)

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.

Suggested Citation

  • 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 Dee, 2001. "A measurement of the cosmological mass density from clustering in the 2dF Galaxy Redshift Survey," Nature, Nature, vol. 410(6825), pages 169-173, March.
    • Handle: RePEc:nat:nature:v:410:y:2001:i:6825:d:10.1038_35065528
    DOI: 10.1038/35065528
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    Cited by:

    1. Imre Ferenc Barna & Mihály András Pocsai & Gergely Gábor Barnaföldi, 2022. "Self-Similar Solutions of a Gravitating Dark Fluid," Mathematics, MDPI, vol. 10(18), pages 1-11, September.

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