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Most recent numerical simulations suggest that bipolar HII regions, poweredby O-type stars, can be formed at the interface of two colliding clouds. Toobservationally understand the birth of O-type stars, we present a detailedmulti-wavelength analysis of an area of 1 deg x 1 deg hosting G8.14+0.23 HIIregion associated with an infrared bipolar nebula (BPN). Based on the radiocontinuum map, the HII region is excited by at least an O-type star, which islocated toward the waist of the BPN. The NANTEN2 13CO line data reveal theexistence of two extended clouds at [9, 14.3] and [15.3, 23.3] km/s toward thesite G8.14+0.23, which are connected in the position-velocity space through abroad-bridge feature at the intermediate velocity range. A"cavity/intensity-depression" feature is evident in the blueshifted cloud, andis spatially matched by the "elongated redshifted cloud". The spatial andvelocity connections of the clouds suggest their interaction in the siteG8.14+0.23. The analysis of deep near-infrared photometric data reveals thepresence of clusters of infrared-excess sources, illustrating ongoing starformation activities in both the clouds. The O-type star is part of theembedded cluster seen in the waist of the BPN, which is observed toward thespatial matching zone of the cavity and the redshifted cloud. The observationalresults appear to be in reasonable agreement with the numerical simulations ofcloud-cloud collision (CCC), suggesting that the CCC process seems to beresponsible for the birth of the O-type star in G8.14+0.23.

Unveiling molecular clouds toward bipolar HII region G8.14+0.23