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- Title
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.
- Authors
Kohno, Mikito; Tachihara, Kengo; Torii, Kazufumi; Fujita, Shinji; Nishimura, Atsushi; Kuno, Nario; Umemoto, Tomofumi; Minamidani, Tetsuhiro; Matsuo, Mitsuhiro; Kiridoshi, Ryosuke; Tokuda, Kazuki; Hanaoka, Misaki; Tsuda, Yuya; Kuriki, Mika; Ohama, Akio; Sano, Hidetoshi; Hasegawa, Tetsuo; Sofue, Yoshiaki; Habe, Asao; Onishi, Toshikazu
- 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 (|$\sim\!\! 4\%$|) 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.
- Subjects
MOLECULAR clouds; STARBURSTS; TRACE gases; TELESCOPES; STAR formation; GASES
- Publication
Publications of the Astronomical Society of Japan, 2021, Vol 73, p1
- ISSN
0004-6264
- Publication type
Article
- DOI
10.1093/pasj/psaa015