An ALMA Study of the Massive Molecular Clump N159W-North in the Large Magellanic Cloud: A Possible Gas Flow Penetrating One of the Most Massive Protocluster Systems in the Local Group

Kazuki Tokuda, Taisei Minami, Yasuo Fukui, Tsuyoshi Inoue, Takeru Nishioka, Kisetsu Tsuge, Sarolta Zahorecz, Hidetoshi Sano, Ayu Konishi, C. H. Rosie Chen, Marta Sewiło, Suzanne C. Madden, Omnarayani Nayak, Kazuya Saigo, Atsushi Nishimura, Kei E.I. Tanaka, Tsuyoshi Sawada, Remy Indebetouw, Kengo Tachihara, Akiko KawamuraToshikazu Onishi

研究成果: ジャーナルへの寄稿学術誌査読

1 被引用数 (Scopus)

抄録

Massive dense clumps in the Large Magellanic Cloud can be an important laboratory to explore the formation of populous clusters. We report multiscale ALMA observations of the N159W-North clump, which is the most CO-intense region in the galaxy. High-resolution CO isotope and 1.3 mm continuum observations with an angular resolution of ∼0.″25 (∼0.07 pc) revealed more than five protostellar sources with CO outflows within the main ridge clump. One of the thermal continuum sources, MMS-2, shows an especially massive/dense nature whose total H2 mass and peak column density are ∼104 M ⊙ and ∼1024 cm-2, respectively, and harbors massive (∼100 M ⊙) starless core candidates identified as its internal substructures. The main ridge containing this source can be categorized as one of the most massive protocluster systems in the Local Group. The CO high-resolution observations found several distinct filamentary clouds extending southward from the star-forming spots. The CO (1-0) data set with a larger field of view reveals a conical, ∼30 pc long complex extending toward the northern direction. These features indicate that a large-scale gas compression event may have produced the massive star-forming complex. Based on the striking similarity between the N159W-North complex and the other two previously reported high-mass star-forming clouds in the nearby regions, we propose a "teardrops inflow model"that explains the synchronized, extreme star formation across >50 pc, including one of the most massive protocluster clumps in the Local Group.

本文言語英語
論文番号20
ジャーナルAstrophysical Journal
933
1
DOI
出版ステータス出版済み - 7月 1 2022

!!!All Science Journal Classification (ASJC) codes

  • 天文学と天体物理学
  • 宇宙惑星科学

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