a) A C-band (4.9 GHz) image of W51 IRS1, the location of peak intensity on the W51 Main shell. This region accounts for more than half of the radio luminosity of W51. The colorbar has been selected to emphasize the pointlike sources even though it saturates some of the diffuse emission. The synthesized beam size is θFWHM ≈ 0.3″. b) An unsharp-masked version of the image with a 0.3′′smoothing kernel used for the large-angular-scale flux removal. There are two pointlike sources in field marked by red arrows, e14 at center-left and the cometary e13 toward the lower left. The filamentary features mentioned in Sect. 3.4 are identified by blue arrows. The cyan arrow points along a possible ionized flow, traced by elongated features parallel to the arrow and a rounded feature to the southwest. A counterpart to the northeast is barely visible.
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