ATCA 5.5 GHz image of RCW 49 and surroundings. The contour levels are –0.6, 3, 9, 20, 35, and 60 mJy beam^-1; the synthesized beam is 3′′ × 3′′. Crosses mark the positions of radio sources detected near RCW 49; these are cataloged in Table 2. The arrow shows the position of a bow-shaped structure, S3 (see Sect. 3.4). The WR stars 20a and 20b are marked with solid circles. The inset shows the emission of source “dd”, with contour levels of 2, 4, and 8 mJy beam^-1.