科研之友
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摘要
We present (CO)-C-12 and (CO)-C-13 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 H alpha excess. 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 (CO)-C-12 and (CO)-C-13 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 (CO)-C-12, 0.65 +/- 0.04, and (CO)-C-13, 0.97 +/- 0.12, are on the higher end but consistent within 3 sigma of those of previous studies. Massive star formation occurs in clumps with high masses (> 1.83 x 10(2)M(circle dot)), high linewidths (nu > 1.18 km s(-1)), and high mass densities (> 6.67 x 10(2) M-circle dot pc(-2)). The majority of embedded, massive YSOs are associated with a clump; however, the majority of more evolved, low-mass YSOs are not.
- 出版日期2016-11-1
