A Survey of the SO JK=10-01 Transition toward Massive Star-forming Regions

Astronomy and Astrophysics – Astronomy

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Ism: Clouds, Ism: Molecules, Radio Lines: Ism, Stars: Formation

Scientific paper

We present the most extensive survey to date of the SO ground state transition JK=10-01 (30 GHz). We observed 49 regions of massive star formation with the Max-Planck-Institut für Radioastronomie (MPIfR) 100 m telescope. In addition, the SO JK=43-32 transition was observed with the IRAM 30 m telescope toward a subsample of seven sources. Emission in the SO JK=10-01 transition most likely arises from the parsec-scale molecular clumps surrounding ultracompact H II regions. In general, the SO JK=10-01 line has a Gaussian shape and appears to be optically thin. We derive SO column densities between 0.58×1014 and 12×1014 cm-2 and SO abundances in the range 0.18×10-9-4.4×10-9. Our observations show that the SO ground state transition is an effective tool to study massive star-forming clumps, and the data presented in this paper provide a useful supplement for future multitransition SO studies.

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