The H II region-molecular cloud complex W3: observations of CO, CS, and HCN.
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In this paper, the distribution of the emission from /sup 12 CO, /sup 13 CO, CS, and HCN in the W3 molecular cloud has been mapped, and a velocity gradient is observed across the entire W3 core.Abstract:
The distributions of the emission from /sup 12/CO, /sup 13/CO, CS, and HCN have been mapped in the W3 molecular cloud. The emission is divided into three components according to the spatial distribution of the intensity and the associated velocity. Although the overall cloud is investigated, the emphasis is on the brightest condensation referred to as the W3 core. This dense and dynamically active region contains several embedded compact H II regions, IR sources, and masers. Strong /sup 12/CO self-absorption occurs toward the compact infrared source IRS 5 where emission from dust at 1 mm and in the far-infrared and the emission from /sup 13/CO and HCN are strongest, but the emission from CS, by contrast, is rather weak. Collapse of the W3 core is inferred from the line profiles. A velocity gradient is observed across the W3 core. The observations and derived physical parameters which are presented in this paper will be used in a subsequent paper to develop a model of the W3 region.read more
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