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

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

doi:10.3847/1538-4357/ab46ba

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

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

Astronomy

Research output: Contribution to journal › Article › peer-review

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.

Original language	English (US)
Article number	50
Journal	Astrophysical Journal
Volume	885
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/ab46ba
State	Published - Nov 1 2019

Keywords

ISM: molecules
Magellanic Clouds
galaxies: ISM
radio lines: ISM

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/1538-4357/ab46ba

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Data for: Relations Between Molecular Cloud Structure Sizes and Line Widths in the Large Magellanic Cloud
Wong, T. (Creator), Hughes, A. (Creator), Tokuda, K. (Creator), Indebetouw, R. (Creator), Onishi, T. (Creator), Bandurski, J. B. (Creator), Chen, C. H. R. (Creator), Fukui, Y. (Creator), Glover, S. C. O. (Creator), Klessen, R. S. (Creator), Pineda, J. L. (Creator), Roman-Duval, J. (Creator), Sewilo, M. (Creator), Wojciechowski, E. (Creator) & Zahorecz, S. (Creator), University of Illinois at Urbana-Champaign, Sep 25 2019
DOI: 10.13012/B2IDB-7090706_V1
Dataset

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Wong, T., Hughes, A., Tokuda, K., Indebetouw, R., Onishi, T., Bandurski, J. B., Chen, C. H. R., Fukui, Y., Glover, S. C. O., Klessen, R. S., Pineda, J. L., Roman-Duval, J., Sewiło, M., Wojciechowski, E., & Zahorecz, S. (2019). Relations between Molecular Cloud Structure Sizes and Line Widths in the Large Magellanic Cloud. Astrophysical Journal, 885(1), [50]. https://doi.org/10.3847/1538-4357/ab46ba

Relations between Molecular Cloud Structure Sizes and Line Widths in the Large Magellanic Cloud. / Wong, Tony; Hughes, Annie; Tokuda, Kazuki; Indebetouw, Rémy; Onishi, Toshikazu; Bandurski, Jeffrey B.; Chen, C. H.Rosie; Fukui, Yasuo; Glover, Simon C.O.; Klessen, Ralf S.; Pineda, Jorge L.; Roman-Duval, Julia; Sewiło, Marta; Wojciechowski, Evan; Zahorecz, Sarolta.

In: Astrophysical Journal, Vol. 885, No. 1, 50, 01.11.2019.

Research output: Contribution to journal › Article › peer-review

Wong, T, Hughes, A, Tokuda, K, Indebetouw, R, Onishi, T, Bandurski, JB, Chen, CHR, Fukui, Y, Glover, SCO, Klessen, RS, Pineda, JL, Roman-Duval, J, Sewiło, M, Wojciechowski, E & Zahorecz, S 2019, 'Relations between Molecular Cloud Structure Sizes and Line Widths in the Large Magellanic Cloud', Astrophysical Journal, vol. 885, no. 1, 50. https://doi.org/10.3847/1538-4357/ab46ba

Wong, Tony ; Hughes, Annie ; Tokuda, Kazuki ; Indebetouw, Rémy ; Onishi, Toshikazu ; Bandurski, Jeffrey B. ; Chen, C. H.Rosie ; Fukui, Yasuo ; Glover, Simon C.O. ; Klessen, Ralf S. ; Pineda, Jorge L. ; Roman-Duval, Julia ; Sewiło, Marta ; Wojciechowski, Evan ; Zahorecz, Sarolta. / Relations between Molecular Cloud Structure Sizes and Line Widths in the Large Magellanic Cloud. In: Astrophysical Journal. 2019 ; Vol. 885, No. 1.

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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.",

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AU - Hughes, Annie

AU - Tokuda, Kazuki

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AU - Onishi, Toshikazu

AU - Bandurski, Jeffrey B.

AU - Chen, C. H.Rosie

AU - Fukui, Yasuo

AU - Glover, Simon C.O.

AU - Klessen, Ralf S.

AU - Pineda, Jorge L.

AU - Roman-Duval, Julia

AU - Sewiło, Marta

AU - Wojciechowski, Evan

AU - Zahorecz, Sarolta

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N2 - 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.

AB - 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.

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KW - Magellanic Clouds

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KW - radio lines: ISM

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

Abstract

Keywords

ASJC Scopus subject areas

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