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| Interstellar Nitrogen Isotope Ratios: New NH3 Data from the Galactic Center out to the Perseus Arm | |
Chen, J. L.1 ; Zhang, J. S.1; Henkel, C.2,3; Yan, Y. T.1,2; Yu, H. Z.1; Qiu, J. J.4; Tang, X. D.5,6; Wang, J.1; Liu, W.1; Wang, Y. X.1; Zheng, Y. H.1,7,8; Zhao, J. Y.1; Zou, Y. P.1
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| 2021-12-01 | |
| Source Publication | ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
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| ISSN | 0067-0049 |
| Volume | 257Issue:2Pages:39 |
| Contribution Rank | 5 |
| Abstract | Our aim is to measure the interstellar N-14/N-15 ratio across the Galaxy, to establish a standard data set on interstellar ammonia isotope ratios, and to provide new constraints on the Galactic chemical evolution. The (J, K) = (1, 1), (2, 2), and (3, 3) lines of (NH3)-N-14 and (NH3)-N-15 were observed with the Shanghai Tianma 65 m radio telescope (TMRT) and the Effelsberg 100 m telescope toward a large sample of 210 sources. One hundred fourty-one of these sources were detected by the TMRT in (NH3)-N-14. Eight of them were also detected in (NH3)-N-15. For 10 of the 36 sources with strong NH3 emission, the Effelsberg 100 m telescope successfully detected their (NH3)-N-15(1, 1) lines, including 3 sources (G081.7522, W51D, and Orion-KL) with detections by the TMRT telescope. Thus, a total of 15 sources are detected in both the (NH3)-N-14 and (NH3)-N-15 lines. Line and physical parameters for these 15 sources are derived, including optical depths, rotation and kinetic temperatures, and total column densities. N-14/N-15 isotope ratios were determined from the (NH3)-N-14/(NH3)-N-15 abundance ratios. The isotope ratios obtained from both telescopes agree for a given source within the uncertainties, and no dependence on heliocentric distance and kinetic temperature is seen. N-14/N-15 ratios tend to increase with galactocentric distance, confirming a radial nitrogen isotope gradient. This is consistent with results from recent Galactic chemical model calculations, including the impact of superasymptotic giant branch stars and novae. |
| DOI | 10.3847/1538-4365/ac205a |
| Indexed By | SCI |
| Language | 英语 |
| WOS Keyword | STAR-FORMING CORES ; ORION-KL ; AMMONIA ; FRACTIONATION ; MASER ; HOT ; NUCLEOSYNTHESIS ; MILLIMETER ; (NH3)-N-15 ; EVOLUTION |
| Funding Project | Natural Science Foundation of China[12041302] ; Natural Science Foundation of China[11590782] ; Chinese Academy of Sciences President's International Fellowship Initiative[2021VMA0009] ; China Scholarship Council (CSC) ; NSFC[12003080] ; China Postdoctoral Science Foundation[2019M653144] ; Guangdong Basic and Applied Basic Research Foundation[2019A1515110588] ; Fundamental Research Funds for the Central Universities, Sun Yat-sen University[19lgpy284] ; Heaven Lake Hundred-Talent Program of Xinjiang Uygur Autonomous 432 Region of China ; National Natural Science Foundation of China[11903070] ; National Natural Science Foundation of China[11433008] |
| WOS Research Area | Astronomy & Astrophysics |
| WOS Subject | Astronomy & Astrophysics |
| WOS ID | WOS:000722019400001 |
| Publisher | IOP Publishing Ltd |
| Funding Organization | Natural Science Foundation of China ; Chinese Academy of Sciences President's International Fellowship Initiative ; China Scholarship Council (CSC) ; NSFC ; China Postdoctoral Science Foundation ; Guangdong Basic and Applied Basic Research Foundation ; Fundamental Research Funds for the Central Universities, Sun Yat-sen University ; Heaven Lake Hundred-Talent Program of Xinjiang Uygur Autonomous 432 Region of China ; National Natural Science Foundation of China |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.xao.ac.cn/handle/45760611-7/4363 |
| Collection | 射电天文研究室_恒星形成与演化研究团组 |
| Corresponding Author | Zhang, J. S. |
| Affiliation | 1.Guangzhou Univ, Ctr Astrophys, Guangzhou 510006, Peoples R China 2.Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany 3.King Abdulaziz Univ, Astron Dept, POB 80203, Jeddah 21589, Saudi Arabia 4.Sun Yat Sen Univ, Sch Phys & Astron, Guangzhou 510275, Peoples R China 5.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China 6.Chinese Acad Sci, Key Lab Radio Astron, Beijing, Peoples R China 7.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 8.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China |
| Recommended Citation GB/T 7714 | Chen, J. L.,Zhang, J. S.,Henkel, C.,et al. Interstellar Nitrogen Isotope Ratios: New NH3 Data from the Galactic Center out to the Perseus Arm[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2021,257(2):39. |
| APA | Chen, J. L..,Zhang, J. S..,Henkel, C..,Yan, Y. T..,Yu, H. Z..,...&Zou, Y. P..(2021).Interstellar Nitrogen Isotope Ratios: New NH3 Data from the Galactic Center out to the Perseus Arm.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,257(2),39. |
| MLA | Chen, J. L.,et al."Interstellar Nitrogen Isotope Ratios: New NH3 Data from the Galactic Center out to the Perseus Arm".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 257.2(2021):39. |
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| Chen-2021-Interstell（1910KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
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