Optical images of NGC 6048. Left: Pan-STARRS image of the NGC 6048 system in the r, i, and z filters. The red lines mark the projected distances between NGC 6048 (top right) and the halo object, as well as the companion galaxy PGC214442 (bottom left). Right: WISE colour image at 3.4 μm cut at 1σ level overlaid with ROSAT HRI contours at 3, 5, and 8 × the r.m.s.. The white lines correspond to the red ones in the left panel.