Color − magnitude diagrams in the central region of XMMU J2235. Only spectroscopic members and photo-z retained sources (0.96 < z < 1.82) are shown. Filled blue and red symbols show spectroscopically confirmed members with and without detectable [OII] emission, respectively. The dotted, dashed and long-dashed lines show the expected location of the red sequence based on Kodama & Arimoto (1997) models for different formation redshifts. The dark purple line in the lower panel shows a fit to the red sequence galaxies within the gray shaded region. The shape of all symbols are coded according to morphological classification in the z band: circles are galaxies with nSersic > 2, spiral symbols are galaxies with nSersic < 2, squares are (mostly faint) objects for which no reliable classification is available.
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