Model sky map M_halo of the Geminga X-ray halo flux coming from synchrotron emission as integrated in the 4–12 keV band, for B = 3 μG. The field of view of the SRG/ART-XC observation is reported with a white square, and compared to the XMM-Newton field of view from Manconi et al. (2024) (green dashed circle), as well as with the extension of the TeV gamma rays observed by HAWC (dotted yellow circle).