Left: 4′ × 4′z-band image of the cluster XDCP J1450.1+0904 – cl01 at z = 0.6417. X-ray contours are overlaid in blue, whereas red circles mark the member galaxies used in our kinematic analysis. The solid (dashed) black circle indicates a radius of 1′(0.5′) centered on the X-ray emission. Right: rest-frame velocity histogram of the cluster galaxies. The peculiar velocity (in km s^-1, bottom side) and the redshift values (top side) are reported in the panel with the estimated σ_v, its uncertainty, and the number of the clipped members contributing to the σ_v estimate. The solid curve is the best Gaussian fit of the distribution with variance equal to σ_v, whereas the dotted ones represent its ±1σ uncertainty.

Left: a 4′ × 4′ wide z-band image of cluster XDCP J1119.1+1300 – cl02 at z = 0.6764. Symbols and colors have the same meaning as in Fig. A.1. Red squares mark those galaxies excluded from the analysis because their measured redshift is uncertain or because they are rejected by the σ-clipping procedure described in the text. Right: rest-frame velocity histogram of the cluster galaxies. Here the dashed histograms refer to those galaxies with peculiar velocities | v |  < 3000 km s^-1 from z_cl but which are discarded as members by the iterative 3σ clipping process as described in Sect. 3.3.2.

Left: a 4′ × 4′ wide z-band image of cluster XDCP J1044.7−0119 – cl03 at z = 0.7545. Symbols and colors have the same meaning as in Fig. A.2. Right: rest-frame velocity histogram of the cluster galaxies.

Left: a 4′ × 4′ wide H-band image of cluster XDCP J0002.2−3556 – cl04 at z = 0.7704. Symbols and colors have the same meaning as in Fig. A.2. Right: rest-frame velocity histogram of the cluster galaxies.

Left: a 4′ × 4′ wide z-band image of cluster XDCP J1243.2+1313 – cl05 at z = 0.7913. Symbols and colors have the same meaning as in Fig. A.2. Right: rest-frame velocity histogram of the cluster galaxies.

Left: a 4′ × 4′ wide z-band image of cluster XDCP J0954.2+1738 – cl06 at z = 0.8276. Symbols and colors have the same meaning as in Fig. A.2. Right: rest-frame velocity histogram of the cluster galaxies.

Left: a 4′ × 4′ wide z-band image of cluster XDCP J0010.7−1127 – cl07 at z = 0.8277. Symbols and colors have the same meaning as in Fig. A.2. Right: rest-frame velocity histogram of the cluster galaxies.

Left: a 4′ × 4′ wide z-band image of cluster XDCP J0152.6−1338 – cl08 at z = 0.8289. Symbols and colors have the same meaning as in Fig. A.2. Right: rest-frame velocity histogram of the cluster galaxies.

Left: a 4′ × 4′ wide z-band image of cluster XDCP J2356.2−3441 – cl09 at z = 0.9391. Symbols and colors have the same meaning as in Fig. A.2. Right: rest-frame velocity histogram of the cluster galaxies.

Left: a 4′ × 4′ wide z-band image of cluster XDCP J2215.9−1751 – cl10 at z = 1.2249. Symbols and colors have the same meaning as in Fig. A.2. Right: rest-frame velocity histogram of the cluster galaxies.

Rest-frame velocity histograms of the “literature sample” clusters with a public redshift set. In addition to the same details presented in Appendix A, we also report here the public value of (and its uncertainty) for each cluster as listed in Table 1, and we show them with red Gaussian curves. Although our analysis sometimes produced slightly different values of z_cl with respect to the ones stated by the authors, such differences are always limited to c·Δz_cl/(1 + z_cl) ≲ 100 km s^-1 and hence the two Gaussian curves of each cluster show the same central values. Our estimates of σ_v agree with within the errors albeit sometimes the distributions are far from being Gaussian, especially for those systems experiencing major merging events (see e.g. SpARCS0035).

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