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Journal Articles The Astrophysical Journal Year : 2019

Relations between Molecular Cloud Structure Sizes and Line Widths in the Large Magellanic Cloud

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1
Tony Wong
  • Function : Author
Kazuki Tokuda
  • Function : Author
Rémy Indebetouw
  • Function : Author
Toshikazu Onishi
  • Function : Author
Jeffrey B. Bandurski
  • Function : Author
C. -H. Rosie Chen
  • Function : Author
Yasuo Fukui
  • Function : Author
Simon C. O. Glover
  • Function : Author
Ralf S. Klessen
  • Function : Author
Jorge L. Pineda
  • Function : Author
Julia Roman-Duval
Marta Sewiło
  • Function : Author
Evan Wojciechowski
  • Function : Author
Sarolta Zahorecz
  • Function : Author

Abstract

We present a comparative study of the size-line width relation for substructures within six molecular clouds in the Large Magellanic Cloud (LMC) mapped with the Atacama Large Millimeter/submillimeter Array. Our sample extends our previous study, which compared a Planck detected cold cloud in the outskirts of the LMC with the 30 Doradus molecular cloud and found the typical line width for 1 pc radius structures to be five times larger in 30 Doradus. By observing clouds with intermediate levels of star formation activity, we find evidence that the line width at a given size increases with increasing local and cloud-scale 8 μm intensity. At the same time, the line width at a given size appears to independently correlate with measures of the mass surface density. Our results suggest that both virial-like motions due to gravity and local energy injection by star formation feedback play important roles in determining intracloud dynamics.

Dates and versions

insu-03674396 , version 1 (20-05-2022)

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Tony Wong, Annie Hughes, Kazuki Tokuda, Rémy Indebetouw, Toshikazu Onishi, et al.. Relations between Molecular Cloud Structure Sizes and Line Widths in the Large Magellanic Cloud. The Astrophysical Journal, 2019, 885, ⟨10.3847/1538-4357/ab46ba⟩. ⟨insu-03674396⟩
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