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题名: Oxygen isotopic ratios toward molecular clouds in the Galactic disk
作者: Li, Hai-Kun1, 4; Zhang, Jiang-Shui1; Liu, Zhi-Wei1; Lu, Deng-Rong2; Wang Min(王旻)3; Wang, Jin1
刊名: RESEARCH IN ASTRONOMY AND ASTROPHYSICS
出版日期: 2016-03-01
卷号: 16, 期号:3
关键词: ISM: abundances ; ISM: clouds ; ISM: molecules ; Galaxy: abundances ; radio lines: ISM
DOI: 10.1088/1674-4527/16/3/047
文章类型: Article
英文摘要: We present our observations of the J = 1 - 0 rotation transitions in molecular isotopes (CO)-O-18 and (CO)-O-17 toward a sample of molecular clouds with different galactocentric distances, using the Delingha 13.7 in (DLH 13.7 m) telescope, administered by Purple Mountain Observatory, and its 9-beam SIS receiver. Complementary observations toward several sources with large galactocentric distance are obtained with the IRAM 30m and Mopra 22m telescopes. (CO)-O-18/(CO)-O-17 abundance ratios reflecting the O-18/O-17 isotope ratios are obtained from integrated intensity ratios of (CO)-O-18 and (CO)-O-17. We derived the ratio value for 13 sources covering a galactocentric distance range of 3 kpc to 16 kpc. In combination with our mapping results that provide a ratio value of 3.01 +/- 0.14 in the Galactic center region, it shows that the abundance ratio tends to increase with galactocentric distance, i.e., it supports a radial gradient along the Galactic disk for the abundance ratio. This is consistent with the inside-out formation scenario of our Galaxy. However, our results may suffer from small samples with large galactocentric distance. Combining our data with multi transition lines of (CO)-O-18 and (CO)-O-17 will be helpful for constraining opacities and abundances and further confirming the Galactic radial gradient shown by the isotope ratio O-18/O-17.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: INTERSTELLAR-MEDIUM ; CARBON ; GALAXY ; ABUNDANCES ; O-18/O-17 ; (CO)-O-17 ; REGION
收录类别: SCI
项目资助者: National Basic Research Program of China (973 program)(2012CB821800) ; National Natural Science Foundation of China(11178009 ; Key Laboratory for Radio Astronomy, Chinese Academy of Sciences ; 11473007)
语种: 英语
WOS记录号: WOS:000371883400011
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16168
Appears in Collections:分子云与恒星形成研究团组_期刊论文

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作者单位: 1.Guangzhou Univ, Ctr Astrophys, Guangzhou 510006, Guangdong, Peoples R China
2.Purple Mt Observ, Qinghai Stn, Delingha 817000, Peoples R China
3.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
4.Xiamen Univ, Sch Phys & Mech & Elect Engn, Xiamen 361000, Peoples R China
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