Combined SUMSS at 843 MHz (red) and 1–2 keV eRASS:4 (cyan) image at and around the SNR G309.8+00.0 location. The X-ray emission component is restricted to the 1.0–2.0 keV energy band in which the X-ray emission from the remnant is concentrated. A linear color distribution is used for both image components. The image components are plotted in units of Janskys per beam and counts per pixel with a pixel size of 11″ and 4″ for the radio and X-ray components, respectively. The radio component is convolved with a 1σ Gaussian kernel and the X-ray component has been adaptively smoothed with a Gaussian kernel of 5σ to enhance the visibility of the diffuse emission. Point sources above 3σ significance are filtered out from the X-ray image using a 60″ radius kernel.