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Galactic Interstellar Sulfur Isotopes: A Radial(32)S/S-34 Gradient?
Yu, H. Z.1; Zhang, J. S.1; Henkel, C.2,3; Yan, Y. T.1,2; Liu, W.1; Tang, X. D.4,5; Langer, N.2,6; Luan, T. C.1; Chen, J. L.1; Wang, Y. X.1; Deng, G. G.1; Zou, Y. P.1
Contribution Rank4
AbstractWe present observations of(12)C(32)S,(CS)-C-12-S-34,(CS)-C-13-S-32, and(12)C(33)SJ = 2-1 lines toward a large sample of massive star-forming regions by using the Arizona Radio Observatory 12 m telescope and the IRAM 30 m. Taking new measurements of the carbon(12)C/C-13 ratio, the(32)S/S-34 isotope ratio was determined from the integrated(13)C(32)S/(CS)-C-12-S-34 line intensity ratios for our sample. Our analysis shows a(32)S/S-34 gradient from the inner Galaxy out to a galactocentric distance of 12 kpc. An unweighted least-squares fit to our data yields(32)S/S-34 = (1.56 0.17)D-GC + (6.75 1.22) with a correlation coefficient of 0.77. Errors represent 1 sigma standard deviations. Testing this result by (a) excluding the Galactic center region, (b) excluding all sources with (CS)-S-34 opacities >0.25, (c) combining our data and old data from previous study, and (d) using different sets of carbon isotope ratios leads to the conclusion that the observed(32)S/S-34 gradient is not an artifact but persists irrespective of the choice of sample and carbon isotope data. A gradient with rising(32)S/S-34 values as a function of galactocentric radius implies that the solar system ratio should be larger than that of the local interstellar medium. With the new carbon isotope ratios, we indeed obtain a local(32)S/S-34 isotope ratio about 10% below the solar system one, as expected in the case of decreasing(32)S/S-34 ratios with time and increased amounts of stellar processing. However, taking older carbon isotope ratios based on a lesser amount of data, such a decrease is not seen. No systematic variation of(34)S/S-33 ratios along galactocentric distance was found. The average value is 5.9 1.5, the error denoting the standard deviation of an individual measurement.
KeywordInterstellar medium Stellar nucleosynthesis Abundance ratios Radio astronomy Stellar abundances Galaxy chemical evolution Interstellar molecules Milky Way Galaxy
Indexed BySCI
Funding ProjectNatural Science Foundation of China[11590782] ; China Scholarship Council (CSC)
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000565732700001
Funding OrganizationNatural Science Foundation of China ; China Scholarship Council (CSC)
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorZhang, J. S.
Affiliation1.Guangzhou Univ, Ctr Astrophys, Guangzhou 510006, Peoples R China
2.Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany
3.King Abdulaziz Univ, Astron Dept, POB 80203, Jeddah 21589, Saudi Arabia
4.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China
5.Chinese Acad Sci, Key Lab Radio Astron, Urumqi, Peoples R China
6.Univ Bonn, Argelander Inst Astron, Hugel 71, D-53121 Bonn, Germany
Recommended Citation
GB/T 7714
Yu, H. Z.,Zhang, J. S.,Henkel, C.,et al. Galactic Interstellar Sulfur Isotopes: A Radial(32)S/S-34 Gradient?[J]. ASTROPHYSICAL JOURNAL,2020,899(2):145.
APA Yu, H. Z..,Zhang, J. S..,Henkel, C..,Yan, Y. T..,Liu, W..,...&Zou, Y. P..(2020).Galactic Interstellar Sulfur Isotopes: A Radial(32)S/S-34 Gradient?.ASTROPHYSICAL JOURNAL,899(2),145.
MLA Yu, H. Z.,et al."Galactic Interstellar Sulfur Isotopes: A Radial(32)S/S-34 Gradient?".ASTROPHYSICAL JOURNAL 899.2(2020):145.
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