Fig. 8
Surface density versus envelope mass for the massive dense cores (MDCs) in RCW 79 (filled stars) and those in Cygnus X (open diamonds, Motte et al. 2007). The vertical dashed line is the mass threshold >140 M⊙ for MDCs in this work. The horizontal dashed line represents a surface density threshold of Σ = 0.1 g cm-2 as suggested in the literature (e.g., Butler & Tan 2012; Tan et al. 2013, 2014; Traficante et al. 2015).
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