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Fig. 5

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Color map 8 μm continuum superposed on the white contours of the 13CO (3–2) integrated intensity of the R-S HFS. The red circles mark the collision of two dense components, as identified by Miyawaki et al. (2022). The black plus signs indicate the distribution of massive stars in W49 confirmed by Wu et al. (2016). The dotted black line denotes the waist of the bipolar bubble, and the white plus sign is where the 1420 MHz continuum radiation is strongest. The dashed white lines mark the outline of the bipolar bubble.

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