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Sulphur and carbon isotopes towards Galactic centre clouds

文献类型：期刊论文

作者Humire, P. K.1; Thiel, V1; Henkel, C.1,2,3; Belloche, A.1; Loison, J-C4; Pillai, T.1,5; Riquelme, D.1; Wakelam, V6; Langer, N.1,7; Hernandez-Gomez, A.1
刊名ASTRONOMY & ASTROPHYSICS
出版日期2020-10-23
卷号642页码:A222
关键词Galaxy: centre submillimetre: ISM Galaxy: formation Galaxy: evolution stars: atmospheres submillimetre: general
ISSN号0004-6361
DOI10.1051/0004-6361/202038216
产权排序3
英文摘要Context. Measuring isotopic ratios is a sensitive technique used to obtain information on stellar nucleosynthesis and chemical evolution.Aims. We present measurements of the carbon and sulphur abundances in the interstellar medium of the central region of our Galaxy. The selected targets are the +50 km s(-1) Cloud and several line-of-sight clouds towards Sgr B2(N).Methods. Towards the +50 km s(-1) Cloud, we observed the J = 2-1 rotational transitions of (CS)-C-12-S-32, (CS)-C-12-S-34, (CS)-C-13-S-32, (CS)-C-12-S-33, and (CS)-C-13-S-34, and the J = 3-2 transitions of (CS)-C-12-S-32 and (CS)-C-12-S-34 with the IRAM-30 m telescope, as well as the J = 6-5 transitions of (CS)-C-12-S-34 and (CS)-C-13-S-32 with the APEX 12 m telescope, all in emission. The J = 2-1 rotational transitions of (CS)-C-12-S-32, (CS)-C-12-S-34, (CS)-C-13-S-32, and (CS)-C-13-S-34 were observed with ALMA in the envelope of Sgr B2(N), with those of (CS)-C-12-S-32 and (CS)-C-12-S-34 also observed in the line-of-sight clouds towards Sgr B2(N), all in absorption.Results. In the +50 km s(-1) Cloud we derive a C-12/C-13 isotopic ratio of 22.1 (+3.3)(-2.4) -2.4+3.3 , that leads, with the measured (CS)-C-13-S-32/(CS)-C-12-S-34 line intensity ratio, to a S-32/S-34 ratio of 16.3 (+3.0)(2.4) -2.4+3.0 . We also derive the S-32/S-34 isotopic ratio more directly from the two isotopologues (CS)-C-13-S-32 and (CS)-C-13-S-34, which leads to an independent S-32/S-34 estimation of 16.3 (+2.1)(-1.7) -1.7+2.1 and 17.9 5.0 for the +50 km s(-1) Cloud and Sgr B2(N), respectively. We also obtain a S-34/S-33 ratio of 4.3 +/- 0.2 in the +50 km s(-1) Cloud.Conclusions. Previous studies observed a decreasing trend in the S-32/S-34 isotopic ratios when approaching the Galactic centre. Our result indicates a termination of this tendency at least at a galactocentric distance of 130 (+60)(-30) -30+60 pc. This is at variance with findings based on C-12/C-13, N-14/N-15, and O-18/O-17 isotope ratios, where the above-mentioned trend is observed to continue right to the central molecular zone. This can indicate a drop in the production of massive stars at the Galactic centre, in the same line as recent metallicity gradient ([Fe/H]) studies, and opens the work towards a comparison with Galactic and stellar evolution models.
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WOS关键词DENSE MOLECULAR CLOUDS ; INTERSTELLAR-MEDIUM ; CHEMICAL EVOLUTION ; MASSIVE STARS ; LINE SURVEY ; RATIOS ; ABUNDANCES ; MONOSULFIDE ; ABSORPTION ; CHEMISTRY
资助项目International Max Planck Research School (IMPRS) for Astronomy and Astrophysics at the University of Bonn ; International Max Planck Research School (IMPRS) for Astronomy and Astrophysics at the University of Cologne ; INSU/CNRS (France) ; MPG (Germany) ; IGN (Spain)
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000586586300002
出版者EDP SCIENCES S A
资助机构International Max Planck Research School (IMPRS) for Astronomy and Astrophysics at the University of Bonn ; International Max Planck Research School (IMPRS) for Astronomy and Astrophysics at the University of Cologne ; INSU/CNRS (France) ; MPG (Germany) ; IGN (Spain)
源URL[http://ir.xao.ac.cn/handle/45760611-7/3716]  
专题恒星形成与演化研究团组
通讯作者Humire, P. K.
作者单位1.Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany
2.King Abdulaziz Univ, Dept Astron, POB 80203, Jeddah 21589, Saudi Arabia
3.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China
4.Univ Bordeaux, CNRS, Inst Sci Mol ISM, 351 Cours Liberat, F-33400 Talence, France
5.Boston Univ, Inst Astrophys Res, 725 Commonwealth Ave, Boston, MA 02215 USA
6.Univ Bordeaux, CNRS, Lab Astrophys Bordeaux, B18N,Allee Geoffroy St Hilaire, F-33615 Pessac, France
7.Univ Bonn, Argelander Inst Astron, Hugel 71, D-53121 Bonn, Germany
推荐引用方式
GB/T 7714		 Humire, P. K.,Thiel, V,Henkel, C.,et al. Sulphur and carbon isotopes towards Galactic centre clouds[J]. ASTRONOMY & ASTROPHYSICS,2020,642:A222.
APA Humire, P. K..,Thiel, V.,Henkel, C..,Belloche, A..,Loison, J-C.,...&Menten, K. M..(2020).Sulphur and carbon isotopes towards Galactic centre clouds.ASTRONOMY & ASTROPHYSICS,642,A222.
MLA Humire, P. K.,et al."Sulphur and carbon isotopes towards Galactic centre clouds".ASTRONOMY & ASTROPHYSICS 642(2020):A222.

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