X-ray image of J0723. Left panel: eROSITA exposure-corrected image in the 0.2–2.3 keV band, smoothed with a Gaussian of σ = 10″. Right panel: Chandra exposure-corrected image in the 0.5–7 keV band, smoothed with a Gaussian of σ = 2″. The images are centered at the coordinate (RA = 7:23:19.20, Dec = −73:27:22.5). The large and small red circles show the positions of R₅₀₀ = 1.32 Mpc and R₂₅₀₀ = 0.54 Mpc, determined from the hydrostatic mass profile (R₅₀₀/R₂₅₀₀ is the radius within which the average density is 500/2500 times the critical density at cluster’s redshift, see Sect. 3). On the eROSITA image, the emission of the cluster clearly extends to ∼R₅₀₀. On the Chandra image, the emission only slightly exceeds R₂₅₀₀, but the cluster core is better resolved. The red point sources on the Chandra image (visible as larger white sources on the eROSITA image due to the larger PSF) are AGN which are masked in the analysis. Some bright point sources are marked on the eROSITA image.