A radio-luminous core in LH-SBC3. Left: IRAC2 image of the LH-SBC3 core area overlaid by the contours of NOEMA 3 mm continuum (blue), LOFAR 150 MHz (cyan) and SPIRE 500 μm (brown dashed). The four confirmed members are marked as red circles and labelled with their IDs. The 3 mm contours start at 2σ in steps of 1σ. The thick cyan contours show the 150 MHz continuum at 6″ starting at 3σ in steps of 1σ. The 500 μm contours are at 20, 40, 60 mJy beam⁻¹ levels. Beams of the 3 mm map, the LOFAR 150MHz at 0.3″ and the LOFAR 150 MHz map at 6″ are shown in the bottom left corner in blue, cyan, and hatched cyan patterns, respectively. Right: zoom-in on the radio galaxy LH-SBC3.a. The cyan contours represent the 150 MHz continuum at 0.3″ starting at 3σ in steps of 1σ. Note that LH-SBC3.d. shows marginal detection of ∼3σ, which reinforces that it is a separate galaxy from LH-SBC3.a.