2016ApJ...831...32N

We present ¹²CO and ¹³CO molecular gas data observed by ALMA, massive early-stage young stellar objects (YSOs) identified by applying color-magnitude cuts to Spitzer and Herschel photometry, and low-mass late-stage YSOs identified via Hαexcess. Using dendrograms, we derive properties for the molecular cloud structures. This is the first time a dendrogram analysis has been applied to extragalactic clouds. The majority of clumps have a virial parameter equal to unity or less. The size-linewidth relations of ¹²CO and ¹³CO show the clumps in this study have a larger linewidth for a given size (by factors of 3.8 and 2.5, respectively) in comparison to several, but not all, previous studies. The larger linewidths in 30 Doradus compared to typical Milky Way quiescent clumps are probably due to the former's highly energetic environmental conditions. The slopes of the size-linewidth relations of ¹²CO, 0.65 ± 0.04, and ¹³CO, 0.97 ± 0.12, are on the higher end but consistent within 3σ of those of previous studies. Massive star formation occurs in clumps with high masses (>1.83 x 10² M_☉), high linewidths (v > 1.18 km s^–1), and high mass densities (>6.67 x 10² M_☉ pc^–2). The majority of embedded, massive YSOs are associated with a clump; however, the majority of more evolved, low-mass YSOs are not.