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Oxygen isotopic ratios toward molecular clouds in the Galactic disk
Li, Hai-Kun1,4; Zhang, Jiang-Shui1; Liu, Zhi-Wei1; Lu, Deng-Rong2; Wang, Min3; Wang, Jin1
AbstractWe 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.
KeywordIsm: Abundances Ism: Clouds Ism: Molecules Galaxy: Abundances Radio Lines: Ism
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000371883400011
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Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.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
Recommended Citation
GB/T 7714
Li, Hai-Kun,Zhang, Jiang-Shui,Liu, Zhi-Wei,et al. Oxygen isotopic ratios toward molecular clouds in the Galactic disk[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2016,16(3).
APA Li, Hai-Kun,Zhang, Jiang-Shui,Liu, Zhi-Wei,Lu, Deng-Rong,Wang, Min,&Wang, Jin.(2016).Oxygen isotopic ratios toward molecular clouds in the Galactic disk.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,16(3).
MLA Li, Hai-Kun,et al."Oxygen isotopic ratios toward molecular clouds in the Galactic disk".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 16.3(2016).
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