Oxygen Isotopes Reveal Low-mass Star Dominance in the Small Magellanic Cloud
文献类型：期刊论文
| 作者 | Gong, Yan1,2; Zhang, Zhi-yu3,4; Henkel, Christian2,7; Chen, C. -H. Rosie2; Yang, Wenjin2,3,4; Tang, Xindi6,7; Hunt, Leslie K.5; Weiss, Axel2; Wu, Gang7; Yan, Yaoting2 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2025-12-01 |
| 卷号 | 994期号:2页码:158 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ae1035 |
| 产权排序 | 5 |
| 英文摘要 | Oxygen isotope abundances and their ratios are fingerprints of stellar evolution, and therefore provide a powerful tool in tracing the enrichment history of galaxies. However, their behavior in low-metallicity dwarf galaxies remains largely unexplored. The Small Magellanic Cloud (SMC), a nearby analog of young high-redshift galaxies, offers an ideal laboratory to investigate this regime. Using the Atacama Compact Array, we observed the J = 2 -> 1 transitions of 12CO, 13CO, C18O, and C17O from the massive star-forming region LIRS 36 (aka N12A), achieving the first detection of C17O in the SMC. This detection enables the first direct measurement of the 18O/17O abundance ratio of 0.87 +/- 0.26 in this galaxy, which is substantially lower than all values in the literature, including molecular clouds in the Milky Way and other galaxies. Such a low ratio of 18O/17O, together with a high 13CO/C18O ratio, indicates chemical enrichment dominated by low-mass stars, consistent with the observed paucity of high-mass stars in the SMC. We suggest that the SMC is governed by a top-light integrated galaxy-wide initial mass function, predicted by the SMC's persistently low star formation activities. |
| WOS关键词 | STELLAR INITIAL MASS ; MOLECULAR ABUNDANCES ; FORMATION HISTORY ; AGB STARS ; RATIO ; NUCLEOSYNTHESIS ; CARBON ; GALAXY ; I. ; METALLICITY |
| 资助项目 | The Ministry of Science and Technology of China[2023YFA1608200] ; the National Natural Science Foundation of China[12427901] ; the Strategic Priority Research Program of the Chinese Academy of Sciences[XDB0800301] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001621754100001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | The Ministry of Science and Technology of China ; the National Natural Science Foundation of China ; the Strategic Priority Research Program of the Chinese Academy of Sciences |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/8329]  |
| 专题 | 恒星形成与演化研究团组 |
| 通讯作者 | Gong, Yan |
| 作者单位 | 1.Chinese Acad Sci, Purple Mt Observ, 10 Yuanhua Rd, Nanjing 210023, Peoples R China 2.Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany 3.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210023, Peoples R China 4.Nanjing Univ, Key Lab Modern Astron & Astrophys, Minist Educ, Nanjing 210023, Peoples R China 5.INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy 6.State Key Lab Radio Astron & Technol, Beijing 100101, Peoples R China 7.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China |
| 推荐引用方式 GB/T 7714 | Gong, Yan,Zhang, Zhi-yu,Henkel, Christian,et al. Oxygen Isotopes Reveal Low-mass Star Dominance in the Small Magellanic Cloud[J]. ASTROPHYSICAL JOURNAL,2025,994(2):158. |
| APA | Gong, Yan.,Zhang, Zhi-yu.,Henkel, Christian.,Chen, C. -H. Rosie.,Yang, Wenjin.,...&Menten, Karl M..(2025).Oxygen Isotopes Reveal Low-mass Star Dominance in the Small Magellanic Cloud.ASTROPHYSICAL JOURNAL,994(2),158. |
| MLA | Gong, Yan,et al."Oxygen Isotopes Reveal Low-mass Star Dominance in the Small Magellanic Cloud".ASTROPHYSICAL JOURNAL 994.2(2025):158. |
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