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Using CO line ratios to trace compressed areas in bubble N131

文献类型：期刊论文

作者Zhang, Chuan-Peng1,2,5; Li, Guang-Xing3; Zhou, Chenlin1,4,5; Yuan, Lixia1,4,5; Zhu, Ming1,5
刊名ASTRONOMY & ASTROPHYSICS
出版日期2019-11-01
卷号631页码:6
ISSN号0004-6361
关键词ISM: bubbles infrared: ISM stars: formation molecular data ISM: individual objects: N131
DOI10.1051/0004-6361/201936063
英文摘要Aims. N131 is a typical infrared dust bubble showing an expanding ring-like shell. We study the CO line ratios that can be used to trace the interaction in the expanding bubble. Methods. We carried out new CO (3-2) observations toward bubble N131 using the 15 m JCMT, and derived line ratios by combining these observations with our previous CO (2-1) and CO (1-0) data from IRAM 30 m observations. To trace the interaction between the molecular gas and the ionized gas in the HII region, we used RADEX to model the dependence of the CO line ratios on kinetic temperature and H-2 volume density, and examined the abnormal line ratios based on other simulations. Results. We present CO (3-2), CO (2-1), and CO (1-0) integrated intensity maps convolved to the same angular resolution (22.5 ''). The three different CO transition maps show a similar morphology. The line ratios of WCO(3-2)/WCO(2-1) mostly range from 0.2 to 1.2 with a median of 0.54 +/- 0.12, while the line ratios of WCO(2-1)/WCO(1-0) range from 0.5 to 1.6 with a median of 0.84 +/- 0.15. The high CO line ratios WCO(3-2)/WCO(2-1) greater than or similar to 0.8 and WCO(2-1)/WCO(1-0) greater than or similar to 1.2 are beyond the threshold predicted by numerical simulations based on the assumed density-temperature structure for the inner rims of the ring-like shell, where the compressed areas are located in bubble N131. Conclusions. These high CO integrated intensity ratios, such as WCO(3-2)/WCO(2-1) greater than or similar to 0.8 and WCO(2-1)/WCO(1-0) greater than or similar to 1.2, can be used as a tracer of gas-compressed regions with a relatively high temperature and density. This further suggests that the non-Gaussian part of the line-ratio distribution can be used to trace the interaction between the molecular gas and the hot gas in the bubble.
WOS关键词MILKY-WAY ; MOLECULAR GAS ; GALACTIC PLANE ; DATA RELEASE ; GALAXIES ; CLOUDS ; J=2-1 ; DISK
资助项目National Natural Science Foundation of China[11703040] ; National Natural Science Foundation of China[11743007] ; National Natural Science Foundation of China[U1531246] ; National Key Basic Research Program of China (973 Program)[2015CB857101] ; MPG-CAS Joint Doctoral Promotion Program (DPP) ; China Scholarship Council (CSC) in Germany ; National Key R&D Program of China[2017YFA0402700] ; STFC
WOS研究方向Astronomy & Astrophysics
语种英语
出版者EDP SCIENCES S A
WOS记录号WOS:000515096100002
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Basic Research Program of China (973 Program) ; National Key Basic Research Program of China (973 Program) ; MPG-CAS Joint Doctoral Promotion Program (DPP) ; MPG-CAS Joint Doctoral Promotion Program (DPP) ; China Scholarship Council (CSC) in Germany ; China Scholarship Council (CSC) in Germany ; National Key R&D Program of China ; National Key R&D Program of China ; STFC ; STFC ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Basic Research Program of China (973 Program) ; National Key Basic Research Program of China (973 Program) ; MPG-CAS Joint Doctoral Promotion Program (DPP) ; MPG-CAS Joint Doctoral Promotion Program (DPP) ; China Scholarship Council (CSC) in Germany ; China Scholarship Council (CSC) in Germany ; National Key R&D Program of China ; National Key R&D Program of China ; STFC ; STFC ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Basic Research Program of China (973 Program) ; National Key Basic Research Program of China (973 Program) ; MPG-CAS Joint Doctoral Promotion Program (DPP) ; MPG-CAS Joint Doctoral Promotion Program (DPP) ; China Scholarship Council (CSC) in Germany ; China Scholarship Council (CSC) in Germany ; National Key R&D Program of China ; National Key R&D Program of China ; STFC ; STFC ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Basic Research Program of China (973 Program) ; National Key Basic Research Program of China (973 Program) ; MPG-CAS Joint Doctoral Promotion Program (DPP) ; MPG-CAS Joint Doctoral Promotion Program (DPP) ; China Scholarship Council (CSC) in Germany ; China Scholarship Council (CSC) in Germany ; National Key R&D Program of China ; National Key R&D Program of China ; STFC ; STFC
源URL[http://ir.bao.ac.cn/handle/114a11/54482]  
专题中国科学院国家天文台
通讯作者Zhang, Chuan-Peng
作者单位1.Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China
2.Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
3.Yunnan Univ, South Western Inst Astron Res, Kunming 650500, Yunnan, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
5.Chinese Acad Sci, Natl Astron Observ, CAS Key Lab FAST, Beijing 100101, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Chuan-Peng,Li, Guang-Xing,Zhou, Chenlin,et al. Using CO line ratios to trace compressed areas in bubble N131[J]. ASTRONOMY & ASTROPHYSICS,2019,631:6.
APA Zhang, Chuan-Peng,Li, Guang-Xing,Zhou, Chenlin,Yuan, Lixia,&Zhu, Ming.(2019).Using CO line ratios to trace compressed areas in bubble N131.ASTRONOMY & ASTROPHYSICS,631,6.
MLA Zhang, Chuan-Peng,et al."Using CO line ratios to trace compressed areas in bubble N131".ASTRONOMY & ASTROPHYSICS 631(2019):6.

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