448 Numerical simulations in cosmology
(a)(b)
Figure 15.12. (a) Two-point velocity bias. (b)Top panel: 3D rms velocity for halos
(circles) and for dark matter (full curve) in the 12 largest clusters.Bottom panel: velocity
bias in the clusters. The bias in the first point increases to 1.2 if the central cD halos
are excluded from analysis. Errors correspond to 1-sigma errors of the mean obtained by
averaging over 12 clusters at two moments of time. Fluctuations for individual clusters are
larger.