FOREST unbiased Galactic plane imaging survey with the Nobeyama 45 m telescope (FUGIN). VI. Dense gas and mini-starbursts in the W 43 giant molecular cloud complex

Mikito Kohno, Kengo Tachihara, Kazufumi Torii, Shinji Fujita, Atsushi Nishimura, Nario Kuno, Tomofumi Umemoto, Tetsuhiro Minamidani, Mitsuhiro Matsuo, Ryosuke Kiridoshi, Kazuki Tokuda, Misaki Hanaoka, Yuya Tsuda, Mika Kuriki, Akio Ohama, Hidetoshi Sano, Tetsuo Hasegawa, Yoshiaki Sofue, Asao Habe, Toshikazu OnishiYasuo Fukui

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

We performed new large-scale 12CO, 13CO, and C18O J = 1–0 observations of the W 43 giant molecular cloud complex in the tangential direction of the Scutum arm (l ∼30) as a part of the FUGIN project. The low-density gas traced by 12CO is distributed over 150 pc × 100 pc (l × b), and has a large velocity dispersion (20–30 km s-1). However, the dense gas traced by C18O is localized in the W 43 Main, G30.5, and W 43 South (G29.96-0.02) high-mass star-forming regions in the W 43 giant molecular cloud (GMC) complex, which have clumpy structures. We found at least two clouds with a velocity difference of ∼10–20 km s-1, both of which are likely to be physically associated with these high-mass star-forming regions based on the results of high 13CO J = 3–2 to J = 1–0 intensity ratio and morphological correspondence with the infrared dust emission. The velocity separation of these clouds in W 43 Main, G30.5, and W 43 South is too large for each cloud to be gravitationally bound. We also revealed that the dense gas in the W 43 GMC has a high local column density, while “the current SFE” (star formation efficiency) of the entire GMC is low (∼4%) compared with the W 51 and M 17 GMC. We argue that the supersonic cloud–cloud collision hypothesis can explain the origin of the local mini-starbursts and dense gas formation in the W 43 GMC complex.

Original languageEnglish
Pages (from-to)S129-S171
JournalPublications of the Astronomical Society of Japan
Volume73
DOIs
Publication statusPublished - Jan 1 2021
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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