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

文献类型:期刊论文

AuthorWang, Chen1,2,3; Yang, Ji1,2; Su, Yang1,2; Du, Fujun1,2; Ma, Yuehui1,2,3; Zhang, Shaobo1,2
SourceASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
Issued Date2019-08-01
Volume243Issue:2Pages:18
ISSN0067-0049
KeywordISM: abundances ISM: clouds ISM: molecules
DOI10.3847/1538-4365/ab2d2e
Corresponding AuthorYang, Ji(jiyang@pmo.ac.cn)
English AbstractWe 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 KeywordINFRARED STAR-CLUSTERS ; CARBON-MONOXIDE ; IRAS SOURCES ; MILKY-WAY ; GALAXY ; PHOTODISSOCIATION ; POPULATION ; EXCITATION ; TELESCOPE ; CATALOG
WOS Research AreaAstronomy & Astrophysics
Language英语
WOS IDWOS:000478621800001
PublisherIOP PUBLISHING LTD
源URL[http://libir.pmo.ac.cn/handle/332002/27064]  
Collection中国科学院紫金山天文台
Corresponding AuthorYang, Ji
Affiliation1.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
Recommended Citation
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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