Left: composed r − g − b image of the field around the FRII radio galaxy. Red, green, and blue channels are the HST F160W, F850lP, and F775W filters. Green and red circles mark the MUSE (m1−m6) and ALMA (a0−a3) sources, respectively. a0 (the FRII core) corresponds to the LUCI source l1, marked in yellow. A second LUCI source, l2, is located ∼1.5 arcmin southeast of a0, outside the image. VLA contours at 1.4 GHz are overlaid in white, starting at the ∼3σ level emission and increasing with a geometric progression. The orange contours mark the ∼2.5σ level of the diffuse X-ray emission (0.5−7 keV). The solid green polygon delimits the region covered simultaneously by all HST filters. The solid magenta line and cyan box are the ALMA HPBW and MUSE FoV, respectively. The solid white line in the bottom left corner is the angular and physical scale. Right: ∼7 × 7 arcsec² (∼60 × 60 kpc²) cutouts of the composed HST r − g − b image, centered on the ALMA detected sources (named as labeled). The cyan contours represent the 3σ moments 0 map of our observations (see Sect. 2.3), starting at the ∼3σ level emission and increasing with a geometric progression. The white ellipse in the bottom right corners represents the restoring beam.