Fig. 3

Top: the 5.5-GHz ATCA image of RCW 49 field. The synthesized beam is 1.9′′ × 1.5′′. Bottom: the 9.0-GHz image of the RCW 49 field. The synthesized beam is 1.2′′ × 0.9′′. The brightness level in Jy beam-1 is shown to the right of each image. The position of the stars WR 20a (N) and WR 20b (S) is indicated with light-gray crosses. The dark-gray circular sector represents the angular size of the extended TeV source HESS J1023−575.
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