X-ray image cutouts in the region of J0921+0007. Left: 4′ × 4′ eROSITA/eFEDS image in the 0.2 − 2.3 keV band, smoothed with a Gaussian kernel. The image is centred on the optical position of the quasar J0921+0007. The concentric circles have radii of 30″ (dotted) and 60″ (dashed). Right: 30″ × 30″ high-resolution Chandra image in the energy range 0.5–7 keV. The ellipse shows a wavdetect-detected source at the optical position of the quasar (marked by a red cross).