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- Title
Sulfur isotopes toward the extended envelope of Sagittarius B2 in the Galactic Center.
- Authors
Li, Qingxu; Li, Juan; Zheng, Siqi; Wang, Junzhi; Gao, Feng; Wu, Yajun
- Abstract
Isotopic ratios are good tools for probing stellar nucleosynthesis and chemical evolution. We perform high-sensitivity mapping observations of the J = 7–6 rotational transitions of OCS, OC34S, O13CS, and OC33S toward the Galactic Center giant molecular cloud Sagittarius B2 with the IRAM 30 m telescope. Positions with optically thin and uncontaminated lines are chosen to determine the sulfur isotope ratios. A 32S/34S ratio of 17.1 ± 0.9 was derived with OCS and OC34S lines, while a 34S/33S ratio of 6.8 ± 1.9 was derived directly from the integrated intensity ratio of OC34S and OC33S. With independent and accurate measurements of the 32S/34S ratio, our results confirm the termination of the decreasing trend of 32S/34S ratios toward the Galactic Center, suggesting a drop in the production of massive stars at the Galactic Center.
- Subjects
GALACTIC center; SULFUR isotopes; SUPERGIANT stars; RADIO lines
- Publication
Publications of the Astronomical Society of Japan, 2024, Vol 76, Issue 1, p46
- ISSN
0004-6264
- Publication type
Article
- DOI
10.1093/pasj/psad078