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We observed molecular clouds in the W33 high-mass star-forming regionassociated with compact and extended HII regions using the NANTEN2 telescope aswell as the Nobeyama 45-m telescope in the $J=$1-0 transitions of $^{12}$CO,$^{13}$CO, and C$^{18}$O as a part of the FOREST Unbiased Galactic planeImaging survey with the Nobeyama 45-m telescope (FUGIN) legacy survey. Wedetected three velocity components at 35 km s$^{-1}$, 45 km s$^{-1}$, and 58 kms$^{-1}$. The 35 km s$^{-1}$ and 58 km s$^{-1}$ clouds are likely to bephysically associated with W33 because of the enhanced $^{12}$CO $J=$ 3-2 to$J=$1-0 intensity ratio as $R_{\rm 3-2/1-0} > 1.0$ due to the ultravioletirradiation by OB stars, and morphological correspondence between thedistributions of molecular gas and the infrared and radio continuum emissionsexcited by high-mass stars. The two clouds show complementary distributionsaround W33. The velocity separation is too large to be gravitationally bound,and yet not explained by expanding motion by stellar feedback. Therefore, wediscuss that a cloud-cloud collision scenario likely explains the high-massstar formation in W33.

publications of the astronomical society of japan

FOREST Unbiased Galactic plane Imaging survey with the Nobeyama 45-m  telescope (FUGIN) : Molecular clouds toward W33 ; possible evidence for a  cloud-cloud collision triggering O star formation