Direct measurements of carbon and sulfur isotope ratios in the Milky Way
Электронный научный архив УРФУ
Информация об архиве | Просмотр оригинала| Поле | Значение | |
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Direct measurements of carbon and sulfur isotope ratios in the Milky Way
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| Автор |
Yan, Y. T.
Henkel, C. Kobayashi, C. Menten, K. M. Gong, Y. Zhang, J. S. Yu, H. Z. Yang, K. Xie, J. J. Wang, Y. X. |
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| Тематика |
ABUNDANCES
GALAXY: EVOLUTION GALAXY: FORMATION HII REGIONS ISM: ABUNDANCES ISM: MOLECULES NUCLEAR REACTIONS NUCLEOSYNTHESIS ASTROPHYSICS CARBON GALAXIES GEOMETRICAL OPTICS ISOTOPES STARS SULFUR ABUNDANCE DIRECT MEASUREMENT GALACTOCENTRIC DISTANCES GALACTOCENTRIC RADIUS GALAXY EVOLUTION GALAXY FORMATIONS HII REGION ISM: ABUNDANCE ISM:MOLECULES ISOTOPE RATIO NUCLEOSYNTHESIS |
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| Описание |
Context. Isotope abundance ratios provide a powerful tool for tracing stellar nucleosynthesis, evaluating the composition of stellar ejecta, and constraining the chemical evolution of the Milky Way. Aims. We aim to measure the 12C/13C, 32S/34S, 32S/33S, 32S/36S, 34S/33S, 34S/36S, and 33S/36S isotope ratios across the Milky Way. Methods. With the IRAM 30 meter telescope, we performed observations of the J = 2-1 transitions of CS, C33S, C34S, C36S, 13CS, 13C33S, and 13C34S as well as the J = 3-2 transitions of C33S, C34S, C36S, and 13CS toward a large sample of 110 high-mass star-forming regions. Results. We measured the 12C/13C, 32S/34S, 32S/33S, 32S/36S, 34S/33S, 34S/36S, and 33S/36S abundance ratios with rare isotopologs of CS, thus avoiding significant saturation effects. With accurate distances obtained from parallax data, we confirm previously identified 12C/13C and 32S/34S gradients as a function of galactocentric distance. In the central molecular zone, 12C/13C ratios are higher than suggested by a linear fit to the disk values as a function of galactocentric radius. While 32S/34S ratios near the Galactic center and in the inner disk are similar, this is not the case for 12C/13C, when comparing central values with those near galactocentric radii of 5 kpc. As was already known, there is no 34S/33S gradient but the average ratio of 4.35 ± 0.44 derived from the J = 2-1 transition lines of C34S and C33S is well below previously reported values. A comparison between solar and local interstellar 32S/34S and 34S/33S ratios suggests that the Solar System may have been formed from gas with a particularly high 34S abundance. For the first time, we report positive gradients of 32S/33S, 34S/36S, 33S/36S, and 32S/36S in our Galaxy. The predicted 12C/13C ratios from the latest Galactic chemical-evolution models are in good agreement with our results. While 32S/34S and 32S/36S ratios show larger differences at larger galactocentric distances, 32S/33S ratios show an offset across the entire inner 12 kpc of the Milky Way. © 2023 The Authors.
International Max Planck Research School for Environmental, Cellular and Molecular Microbiology, IMPRS-Mic; Science and Technology Facilities Council, STFC: ST/R000905/1, ST/V000632/1; Leverhulme Trust; China Scholarship Council, CSC Y.T.Y, is a member of the International Max Planck Research School (IMPRS) for Astronomy and Astrophysics at the Universities of Bonn and Cologne. Y.T.Y, would like to thank the China Scholarship Council (CSC) and the Max-Planck-Institut fur Radioastronomie (MPIfR) for the financial support. Y.T.Y, also thanks his fiancee, Siqi Guo, for her support during this pandemic period. C.K. acknowledges funding from the UK Science and Technology Facility Council through grant ST/R000905/1 and ST/V000632/1. The work was also partly funded by a Leverhulme Trust Research Project Grant on "Birth of Elements". We wish to thank the referee for useful comments. Y.T.Y, is a member of the International Max Planck Research School (IMPRS) for Astronomy and Astrophysics at the Universities of Bonn and Cologne. Y.T.Y, would like to thank the China Scholarship Council (CSC) and the Max-Planck-Institut für Radioastronomie (MPIfR) for the financial support. Y.T.Y, also thanks his fiancee, Siqi Guo, for her support during this pandemic period. C.K. acknowledges funding from the UK Science and Technology Facility Council through grant ST/R000905/1 and ST/V000632/1. The work was also partly funded by a Leverhulme Trust Research Project Grant on "Birth of Elements". We thank the IRAM staff for help provided during the observations. |
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| Дата |
2024-04-05T16:15:55Z
2024-04-05T16:15:55Z 2023 |
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| Тип |
Article
Journal article (info:eu-repo/semantics/article) |info:eu-repo/semantics/publishedVersion |
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| Идентификатор |
Yan, YT, Henkel, C, Kobayashi, C, Menten, KM, Gong, Y, Zhang, JS, Yu, HZ, Yang, K, Xie, JJ & Wang, YX 2023, 'Direct measurements of carbon and sulfur isotope ratios in the Milky Way', Astronomy and Astrophysics, Том. 670, A98. https://doi.org/10.1051/0004-6361/202244584
Yan, Y. T., Henkel, C., Kobayashi, C., Menten, K. M., Gong, Y., Zhang, J. S., Yu, H. Z., Yang, K., Xie, J. J., & Wang, Y. X. (2023). Direct measurements of carbon and sulfur isotope ratios in the Milky Way. Astronomy and Astrophysics, 670, [A98]. https://doi.org/10.1051/0004-6361/202244584 0004-6361 Final All Open Access, Hybrid Gold, Green https://www.scopus.com/inward/record.uri?eid=2-s2.0-85148513610&doi=10.1051%2f0004-6361%2f202244584&partnerID=40&md5=bfd931c0023341527ac5ff59fb540377 https://www.aanda.org/articles/aa/pdf/2023/02/aa44584-22.pdf http://elar.urfu.ru/handle/10995/130210 10.1051/0004-6361/202244584 85148513610 000936621100010 |
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| Язык |
en
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| Права |
Open access (info:eu-repo/semantics/openAccess)
cc-by https://creativecommons.org/licenses/by/4.0/ |
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application/pdf
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| Издатель |
EDP Sciences
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| Источник |
Astronomy & Astrophysics
Astronomy and Astrophysics |
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