KINEMATIC STRUCTURE of MOLECULAR GAS AROUND HIGH-MASS YSO, PAPILLON NEBULA, in N159 EAST in the LARGE MAGELLANIC CLOUD: A NEW PERSPECTIVE with ALMA

Kazuya Saigo, Toshikazu Onishi, Omnarayani Nayak, Margaret Meixner, Kazuki Tokuda, Ryohei Harada, Yuuki Morioka, Marta Sewiło, Remy Indebetouw, Kazufumi Torii, Akiko Kawamura, Akio Ohama, Yusuke Hattori, Hiroaki Yamamoto, Kengo Tachihara, Tetsuhiro Minamidani, Tsuyoshi Inoue, Suzanne Madden, Maud Galametz, Vianney LebouteillerC. H.Rosie Chen, Norikazu Mizuno, Yasuo Fukui

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Abstract

We present the ALMA Band 3 and Band 6 results of 12CO(2-1), 13CO(2-1), H30α recombination line, free-free emission around 98 GHz, and the dust thermal emission around 230 GHz toward the N159 East Giant Molecular Cloud (N159E) in the Large Magellanic Cloud (LMC). LMC is the nearest active high-mass star-forming face-on galaxy at a distance of 50 kpc and is the best target for studing high-mass star formation. ALMA observations show that N159E is the complex of filamentary clouds with the width and length of ∼1 pc and several parsecs. The total molecular mass is 0.92 × 105 M o from the 13CO(2-1) intensity. N159E harbors the well-known Papillon Nebula, a compact high-excitation H ii region. We found that a YSO associated with the Papillon Nebula has the mass of 35 M o and is located at the intersection of three filamentary clouds. It indicates that the formation of the high-mass YSO was induced by the collision of filamentary clouds. Fukui et al. reported a similar kinematic structure toward two YSOs in the N159 West region, which are the other YSOs that have the mass of 35 M o. This suggests that the collision of filamentary clouds is a primary mechanism of high-mass star formation. We found a small molecular hole around the YSO in Papillon Nebula with a sub-parsec scale. It is filled by free-free and H30α emission. The temperature of the molecular gas around the hole reaches ∼80 K. It indicates that this YSO has just started the distruction of parental molecular cloud.

Original languageEnglish
Article number108
JournalAstrophysical Journal
Volume835
Issue number1
DOIs
Publication statusPublished - Jan 20 2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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