Key points are not available for this paper at this time.
We measure the monopole moment of the three-point correlation function on scales 1-70 h -1 Mpc in the two-degree Field Galaxy Redshift Survey (2dFGRS). Volume-limited samples are constructed using a series of integral magnitude bins between M = -18 to -22. Our measurements with a novel edge-corrected estimator represent most, if not all, three-point level monopole or angular averaged information in the catalogue. We fit a perturbative non-linear bias model to a joint data vector formed from the estimated two-and three-point correlation functions. Two different models are used: an analytic model based on Eulerian perturbation theory including bias and redshift distortions and a phenomenological bias model based on the direct redshift space measurements in the large Virgo simulations. To interpret the clustering results, we perform a three-parameter Gaussian maximum-likelihood analysis. In the canonical -21 to -20 volume-limited sample, we find 8 = 0.93 +0.06 -0.2 , b = 1.04 +0.23 -0.09 and b 2 = -0.06 +0.003 -0.001 . Our estimate of 8 is robust across the different volume-limited samples constructed. These results, based solely on the large-scale clustering of galaxies, are in excellent agreement with previous analyses using the Wilkinson Anisotropy Probe; this is a spectacular success of the concordance model. We also present two-parameter fits for the bias parameters, which are in excellent agreement with the previous findings of the bias evolution in the 2dFGRS.
Pan et al. (2005) studied this question.