Optical/NIR appearance of the galaxy cluster XMMU J1007.4+1237 at z = 1.555 with XMM-Newton X-ray contours overlaid in cyan in the logarithmically spaced range [0.014, 0.074] counts arcsec-2 (0.35–2.4 keV). Left: z + H-band color composite (2.3′ × 2.3′) centered on the cluster. Spectroscopic cluster members are marked by white circles, 30″ (dashed) and 60″ (solid) radii around the X-ray center are indicated in yellow. Right: H-band zoom on the cluster core region. Red (IDs 1 and 2) and blue starburst (IDs 3 and 4) cluster members are marked by small circles, spectroscopically confirmed foreground galaxies are indicated by green crosses, and the outer dashed circle represents the 30″ radius.
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