Fig. 2

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Filament structures of the W49A region. The color map is the distribution of the hydrogen molecular column density. The range of contours (from the outside in) is from 7.06 × 1021 cm−2 to 1.71 × 1023 cm−2. The star-like skeleton shows the filaments, and the circles and boxes represent W49A-N and the dense clumps from the catalog of Urquhart et al. (2014) and De Buizer et al. (2021). Plus signs in the figure represent the YSOs marked by Saral et al. (2015) in W49, and the cross signs denote YSOs reported by Kuhn et al. (2021). A black cross represents Class I YSO, a red cross is a Class II YSO, a green plus sign represents Class III YSOs, and a green cross sign is for a flat SED source.
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