Issue |
A&A
Volume 679, November 2023
|
|
---|---|---|
Article Number | L6 | |
Number of page(s) | 6 | |
Section | Letters to the Editor | |
DOI | https://doi.org/10.1051/0004-6361/202348017 | |
Published online | 03 November 2023 |
Letter to the Editor
Sulfur isotope ratios in the Large Magellanic Cloud
1
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
e-mail: ygong@mpifr-bonn.mpg.de
2
Xinjiang Astronomical Observatory, Chinese Academy of Sciences, 150 Science 1-Street, Urumqi, Xinjiang 830011, PR China
3
School of Astronomy & Space Science, Nanjing University, 163 Xianlin Avenue, Nanjing 210023, PR China
4
Argelander-Institut für Astronomie, Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany
5
Guangxi Key Laboratory for Relativistic Astrophysics, Department of Physics, Guangxi University, Nanning 530004, PR China
6
Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023, PR China
7
Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Nanjing 210023, PR China
8
University of Chinese Academy of Sciences, Beijing 100049, PR China
Received:
18
September
2023
Accepted:
26
September
2023
Context. Sulfur isotope ratios have emerged as a promising tool for tracing stellar nucleosynthesis, quantifying stellar populations, and investigating the chemical evolution of galaxies. While they are extensively studied in the context of the Milky Way, they still remain largely unexplored in extragalactic environments.
Aims. We focus on investigating the sulfur isotope ratios in the Large Magellanic Cloud (LMC) to gain insights into sulfur enrichment in this nearby system and to establish benchmarks for such ratios in metal-poor galaxies.
Methods. We conducted pointed observations of CS and its isotopologues toward N113, one of the most prominent star-formation regions in the LMC, utilizing the Atacama Pathfinder EXperiment 12 m telescope.
Results. We present the first robust detection of C33S in the LMC by successfully identifying two C33S transitions on a large scale of ∼5 pc. Our measurements result in an accurate determination of the 34S/33S isotope ratio, which is 2.0 ± 0.2. Our comparative analysis indicates that the 32S/33S and 34S/33S isotope ratios are about a factor of two lower in the LMC than in the Milky Way.
Conclusions. Our findings suggest that the low 34S/33S isotope ratio in the LMC can be attributed to a combination of the age effect, low metallicity, and star formation history.
Key words: ISM: clouds / radio lines: ISM / ISM: individual objects: N113 / ISM: molecules
© The Authors 2023
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Open access funding provided by Max Planck Society.
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