Fig. 2
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Broad-band, high-dynamic-range 0.5−4 keV X-ray image of the giant radio nebula W50 by SRG/eROSITA (PV data). The size of the image is 2.2 degrees by 1.1 degrees, corresponding to ∼ 200 × 100 pc at a distance of W50, ∼ 5 kpc. The image is rotated so that the longer side of W50 is aligned with the horizontal axis. Color-coding corresponds to the X-ray surface brightness on the square-root scale spanning two orders of magnitude. The bright spot in the center is SS 433. It appears extended due to the wings of the telescope’s point spread function around SS 433, which itself is heavily saturated in this image. The white contours show the surface brightness of the radio emission from the nebula at 4.85 GHz (Gregory et al. 1996). With these deeper data (compared to the all-sky survey’s data), a faint diffuse emission is seen between bright extended X-ray jets (EXJs), filamentary structures, and the radio boundary of W50. The reduced broad-band image is available at the CDS.
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