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A SiO J=3D5 -> 4 Survey Toward Massive Star Formation Regions

Author:
Li, Shanghuo  Wang, Junzhi  Fang, Min  Zhang, Qizhou  Li, Fei  Zhang, Zhi-Yu  Li, Juan  Zhu, Qingfeng  Zeng, Shaoshan  


Journal:
ASTROPHYSICAL JOURNAL


Issue Date:
2019


Abstract(summary):

We performed a survey in the SiO J =3D 5 -> 4 line toward a sample of 199 Galactic massive star-forming regions at different evolutionary stages with the Submillimeter Telescope (SMT) 10 m and Caltech Submillimeter Observatory (CSO) 10.4 m telescopes. The sample consists of 44 infrared dark clouds (IRDCs), 86 protostellar candidates, and 69 young H IT regions. We detected SiO J =3D 5 -> 4 line emission in 102 sources, with a detection rate of 57%, 37%, and 65% for IRDCs, protostellar candidates, and young H IT regions, respectively. We find both broad line emissions with full widths at zero power >20 km s(-1) and narrow line emissions of SiO in objects at various evolutionary stages, likely associated with high-velocity shocks and low-velocity shocks, respectively. The SiO luminosities do not show apparent differences among various evolutionary stages in our sample. We find no correlation between the SiO abundance and the luminosity-to-mass ratio, indicating that the SiO abundance does not vary significantly in regions at different evolutionary stages of star formation.


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