Colour–magnitude diagrams (Y−H vs. K) of the two GOODS fields and the environments of the HzRGs. The r-YHK and b-YHK galaxies are marked by red and blue dots. YHK galaxies within 1 Mpc of the HzRGs are highlighted by bigger symbols and error bars in the two lower panels. The yellow stars indicate the radio galaxies. The 2σ detection limit of the Ks bands are shown by the dotted lines. Models of a red sequence at z = 1.77 and z = 2.02 are overplotted in the bottom left and right panels respectively (solid lines). For information, models of red sequence at z = 1.6 are also overplotted in the GOODS panels – corresponding to the redshift of the galaxy structure confirmed by Kurk et al. (2009) in the GOODS field (dashed lines). Models indicate the predicted colours of a passively evolving stellar population (zf = 3, 4 and 5 from bottom to top). We also show on the right side of each plot, the histogram of the Y−H colours of all the candidate cluster members (both red and blue galaxies; open histograms). The filled histograms (two lower panels) correspond to YHK-selected galaxies within 1 Mpc of the HzRGs.
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