The 2dF Galaxy Redshift Survey: higher-order galaxy correlation functions


Croton, Darren J.; Gaztanaga, Enrique; Baugh, Carlton; Norberg, Peder; Colless, Matthew; Baldry, Ivan K.; Bland-Hawthorn, Joss; Bridges, Terry J.; Cannon, Russell D.; Cole, Shaun; Collins, Chris A.; Couch, Warrick J.; Dalton, Gavin B.; De Propris, Roberto; Driver, Simon P.; Efstathiou, George P.; Ellis, Richard S.; Frenk, Carlos S.; Glazebrook, Karl; Jackson, C. A.; Lahav, Ofer; Lewis, Ian; Lumsden, Stuart; Maddox, Stephen J.; Madgwick, Darren; Peacock, J. A.; Peterson, Bruce A.; Sutherland, William J.; Taylor, Keith

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We measure moments of the galaxy count probability distribution function in the Two-degree Field Galaxy Redshift Survey (2dFGRS). The survey is divided into volume-limited subsamples in order to examine the dependence of the higher-order clustering on galaxy luminosity. We demonstrate the hierarchical scaling of the averaged p-point galaxy correlation functions, ξ̄p, up to p = 6. The hierarchical amplitudes, Sp = S2Sp-1, are approximately independent of the cell radius used to smooth the galaxy distribution on small to medium scales. On larger scales we find that the higher-order moments can be strongly affected by the presence of rare, massive superstructures in the galaxy distribution. The skewness S3 has a weak dependence on luminosity, approximated by a linear dependence on log luminosity. We discuss the implications of our results for simple models of linear and non-linear bias that relate the galaxy distribution to the underlying mass.

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Journal article


Monthly Notices of the Royal Astronomical Society, Vol. 352, no. 4 (Aug 2004), pp. 1232-1244






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