Dense Outflowing Molecular Gas in Massive Star-forming Regions
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arXiv
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| Format: | Preprint |
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2024
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| author | Xu, Yani Wang, Junzhi Liu, Shu Li, Juan LI, Yuqiang Luo, Rui Ou, Chao Zheng, Siqi Liu, Yijia |
| author_facet | Xu, Yani Wang, Junzhi Liu, Shu Li, Juan LI, Yuqiang Luo, Rui Ou, Chao Zheng, Siqi Liu, Yijia |
| contents | Dense outflowing gas, traced by transitions of molecules with large dipole moment, is important for understanding mass loss and feedback of massive star formation. HCN 3-2 and HCO$^+$ 3-2 are good tracers of dense outflowing molecular gas, which are closely related to active star formation. In this study, we present on-the-fly (OTF) mapping observations of HCN 3-2 and HCO$^+$ 3-2 toward a sample of 33 massive star-forming regions using the 10-m Submillimeter Telescope (SMT). With the spatial distribution of line wings of HCO$^+$ 3-2 and HCN 3-2, outflows are detected in 25 sources, resulting in a detection rate of 76$\%$. The optically thin H$^{13}$CN and H$^{13}$CO$^+$ 3-2 lines are used to identify line wings as outflows and estimate core mass. The mass $M_{out}$, momentum $P_{out}$, kinetic energy $E_{K}$, force $F_{out}$ and mass loss rate $\dot M_{out}$ of outflow and core mass, are obtained for each source. A sublinear tight correlation is found between the mass of dense molecular outflow and core mass, with an index of $\sim$ 0.8 and a correlation coefficient of 0.88. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_08935 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Dense Outflowing Molecular Gas in Massive Star-forming Regions Xu, Yani Wang, Junzhi Liu, Shu Li, Juan LI, Yuqiang Luo, Rui Ou, Chao Zheng, Siqi Liu, Yijia Astrophysics of Galaxies Dense outflowing gas, traced by transitions of molecules with large dipole moment, is important for understanding mass loss and feedback of massive star formation. HCN 3-2 and HCO$^+$ 3-2 are good tracers of dense outflowing molecular gas, which are closely related to active star formation. In this study, we present on-the-fly (OTF) mapping observations of HCN 3-2 and HCO$^+$ 3-2 toward a sample of 33 massive star-forming regions using the 10-m Submillimeter Telescope (SMT). With the spatial distribution of line wings of HCO$^+$ 3-2 and HCN 3-2, outflows are detected in 25 sources, resulting in a detection rate of 76$\%$. The optically thin H$^{13}$CN and H$^{13}$CO$^+$ 3-2 lines are used to identify line wings as outflows and estimate core mass. The mass $M_{out}$, momentum $P_{out}$, kinetic energy $E_{K}$, force $F_{out}$ and mass loss rate $\dot M_{out}$ of outflow and core mass, are obtained for each source. A sublinear tight correlation is found between the mass of dense molecular outflow and core mass, with an index of $\sim$ 0.8 and a correlation coefficient of 0.88. |
| title | Dense Outflowing Molecular Gas in Massive Star-forming Regions |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2406.08935 |