Formation of high-mass stars in an isolated environment in the Large Magellanic Cloud

Ryohei Harada, Toshikazu Onishi, Kazuki Tokuda, Sarolta Zahorecz, Annie Hughes, Margaret Meixner, Marta Sewiło, Remy Indebetouw, Omnarayani Nayak, Yasuo Fukui, Kengo Tachihara, Kisetstu Tsuge, Akiko Kawamura, Kazuya Saigo, Tony Wong, Jean Philippe Bernard, Ian W. Stephens

Research output: Contribution to journalArticlepeer-review


The aim of this study is to characterize the distribution and basic properties of the natal gas associated with high-mass young stellar objects (YSOs) in isolated environments in the Large Magellanic Cloud. High-mass stars usually form in giant molecular clouds (GMCs) as part of a young stellar cluster, but some OB stars are observed far from GMCs. By examining the spatial coincidence between the high-mass YSOs and 12CO (J = 1-0) emission detected by NANTEN and Mopra observations, we selected ten highmass YSOs that are located away from any of the NANTEN clouds but are detected by the Mopra pointed observations. The ALMA observations revealed that a compact molecular cloud whose mass is a few thousand solar masses or smaller is associated with the high-mass YSOs, which indicates that these compact clouds are the sites of highmass star formation. The high density and high temperature throughout the clouds are explained by the severe photodissociation of CO due to the lower metallicity than in the Galaxy. The star formation efficiency ranges from several to as high as ∼40%, indicating efficient star formation in these environments. The enhanced turbulence may be a cause of the efficient star formation therein, as judged from the gas velocity information and the association with the lower density gas.

Original languageEnglish (US)
Article number44
JournalPublications of the Astronomical Society of Japan
Issue number2
StatePublished - Apr 1 2019


  • ISM: clouds
  • ISM: kinematics and dynamics
  • ISM: molecules
  • Stars: formation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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