Top: z − H vs. H CMD of the cluster field. Galaxies with projected cluster-centric distances of < 30″ (30–60″) are displayed in red (green). Secure spectroscopic cluster members are marked by open squares, foreground objects are crossed-out. The vertical blue line indicates the apparent H magnitude of an L ∗ galaxy at z = 1.56, the black line shows the H-band magnitude limit. Two solar metallicity SSP models for formation redshifts of zf = 5 (red dashed line) and zf = 3 (blue dashed) are overplotted. Bottom: VLT/FORS 2 spectra of three secure cluster members smoothed with a 7 pixel boxcar filter, associated IDs (1, 3, 4) refer to Table 1. Redshifted spectral features are indicated together with an overlaid LRG template spectrum in blue (ID 1), sky emission lines (bottom) and telluric absorption (top) are shown in red.
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