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Molecular Gas toward the Gemini OB1 Molecular Cloud Complex. III. Chemical Abundance

文献类型：期刊论文

作者Wang, Chen1,2,3; Yang, Ji1,2; Su, Yang1,2; Du, Fujun1,2; Ma, Yuehui1,2,3; Zhang, Shaobo1,2
刊名ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
出版日期2019-08-01
卷号243期号:2页码:18
ISSN号0067-0049
关键词ISM: abundances ISM: clouds ISM: molecules
DOI10.3847/1538-4365/ab2d2e
通讯作者Yang, Ji(jiyang@pmo.ac.cn)
英文摘要We present analyses of the (CO)-C-13 abundance X-13CO and the abundance ratio X-13CO/X-C18O of molecular clouds by collecting (CO)-C-12 (CO)-C-13, and (CO)-O-18 (1-0) transitions toward the Galactic anti-center in the ranges 186 degrees.25 < 1 < 195 degrees.25 and -3 degrees.75 < b < 2 degrees.75. The 9 degrees x 6 degrees.5 area contains eight clouds, which can be divided into two types according to X-13CO/X-C18O. Type I clouds, including the chain of Lynds dark clouds, West Front, Gemini OB1 giant molecular cloud (GGMC) 1, and Horn, have lower X-13CO/X-C18O(mean value <10) and lower column density with relatively lower temperature. Type II clouds, including GGMC 2, GGMC 3, GGMC 4, and Swallow, have a higher abundance ratio X-13CO/X-C18O(mean value >10) and higher column density with relatively higher temperature. For all clouds, X(13CO )increases from similar to 2.8 x 10(-7) at the edge to >1.4 x 10(-6) in the interior, which is probably due to an opacity effect of (CO)-C-12. In GGMC 2-4, the mean X-13CO/X-C18O of the molecular gas associated with H II regions and IRAS sources is similar to 14, slightly larger than that (similar to 9) of other subregions. This can be explained by selective far-UV photodissociation of (CO)-O-18. By comparing our sample with other clouds in the plot of X-13CO/X(C18O )against (CO)-C-13 column density, we find that type I clouds are probably at an earlier evolutionary stage than type II clouds.
WOS关键词INFRARED STAR-CLUSTERS ; CARBON-MONOXIDE ; IRAS SOURCES ; MILKY-WAY ; GALAXY ; PHOTODISSOCIATION ; POPULATION ; EXCITATION ; TELESCOPE ; CATALOG
WOS研究方向Astronomy & Astrophysics
语种英语
出版者IOP PUBLISHING LTD
WOS记录号WOS:000478621800001
源URL[http://libir.pmo.ac.cn/handle/332002/27064]  
专题中国科学院紫金山天文台
通讯作者Yang, Ji
作者单位1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
3.Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Chen,Yang, Ji,Su, Yang,et al. Molecular Gas toward the Gemini OB1 Molecular Cloud Complex. III. Chemical Abundance[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2019,243(2):18.
APA Wang, Chen,Yang, Ji,Su, Yang,Du, Fujun,Ma, Yuehui,&Zhang, Shaobo.(2019).Molecular Gas toward the Gemini OB1 Molecular Cloud Complex. III. Chemical Abundance.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,243(2),18.
MLA Wang, Chen,et al."Molecular Gas toward the Gemini OB1 Molecular Cloud Complex. III. Chemical Abundance".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 243.2(2019):18.

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