The 2dF galaxy redshift survey: Hierarchical galaxy clustering

C. M. Baugh*, D. J. Croton, E. Gaztañaga, P. Norberg, M. Colless, I. K. Baldry, J. Bland-Hawthorn, T. Bridges, R. Cannon, S. Cole, C. Collins, W. Couch, G. Dalton, R. De Propris, S. P. Driver, G. Efstathiou, R. S. Ellis, C. S. Frenk, K. Glazebrook, C. JacksonO. Lahav, I. Lewis, S. Lumsden, S. Maddox, D. Madgwick, J. A. Peacock, B. A. Peterson, W. Sutherland, K. Taylor

*Corresponding author for this work

    Research output: Contribution to journalReview articlepeer-review

    62 Citations (Scopus)


    We use the Two-Degree Field Galaxy Redshift Survey (2dFGRS) to test the hierarchical scaling hypothesis: namely, that the p-point galaxy correlation functions can be written in terms of the two-point correlation function or variance. This scaling is expected if an initially Gaussian distribution of density fluctuations evolves under the action of gravitational instability. We measure the volume-averaged p-point correlation functions using a counts-in-cells technique applied to a volume-limited sample of 44 931 L* galaxies. We demonstrate that L* galaxies display hierarchical clustering up to order p = 6 in redshift space. The variance measured for L* galaxies is in excellent agreement with the predictions from a Λ-cold dark matter N-body simulation. This applies to all cell radii considered, 0.3 < (R/h-1 Mpc) < 30. However, the higher order correlation functions of L* galaxies have a significantly smaller amplitude than is predicted for the dark matter for R < 10 h-1 Mpc. This disagreement implies that a non-linear bias exists between the dark matter and L* galaxies on these scales. We also show that the presence of two rare, massive superclusters in the 2dFGRS has an impact on the higher-order clustering moments measured on large scales.

    Original languageEnglish
    Pages (from-to)L44-L48
    JournalMonthly Notices of the Royal Astronomical Society
    Issue number2
    Publication statusPublished - 21 Jun 2004


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