A Possible Chemical Clock in High-mass Star-forming Regions: N(HC3N)/N(N2H+)?
Электронный научный архив УРФУ
Информация об архиве | Просмотр оригинала| Поле | Значение | |
| Заглавие |
A Possible Chemical Clock in High-mass Star-forming Regions: N(HC3N)/N(N2H+)?
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| Автор |
Wang, Y. X.
Zhang, J. S. Yu, H. Z. Wang, Y. Yan, Y. T. Chen, J. L. Zhao, J. Y. Zou, Y. P. |
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| Тематика |
CURVE FITTING
INTELLIGENT SYSTEMS MAGNETIC FLUIDS MAGNETIC SUSCEPTIBILITY MAGNETISM MAGNETIZATION MEAN FIELD THEORY MONTE CARLO METHODS PARTICLE SIZE POLYDISPERSITY ANALYSIS AND CHARACTERIZATION INITIAL SUSCEPTIBILITY MAGNETIZATION CURVES MAGNETOSTATIC PROPERTIES MODIFIED MEAN FIELDS POLYDISPERSE FERROFLUIDS POLYDISPERSE SYSTEMS SIZE POLYDISPERSITY SATURATION MAGNETIZATION ARTICLE COMPUTER SIMULATION MAGNETISM MONTE CARLO METHOD PARTICLE SIZE PREDICTION THEORETICAL STUDY |
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| Описание |
We conducted observations of multiple HC3N (J = 10−9, 12−11, and 16−15) lines and the N2H+ (J = 1−0) line toward a large sample of 61 ultracompact (UC) H ii regions, through the Institut de Radioastronomie Millmétrique 30 m and the Arizona Radio Observatory 12 m telescopes. The N2H+ J = 1−0 line is detected in 60 sources and HC3N is detected in 59 sources, including 40 sources with three lines, 9 sources with two lines, and 10 sources with one line. Using the rotational diagram, the rotational temperature and column density of HC3N were estimated toward sources with at least two HC3N lines. For 10 sources with only one HC3N line, their parameters were estimated, taking one average value of T rot. For N2H+, we estimated the optical depth of the N2H+ J = 1−0 line, based on the line intensity ratio of its hyperfine structure lines. Then the excitation temperature and column density were calculated. When combining our results in UC H ii regions and previous observation results on high-mass starless cores, the N(HC3N)/N(N2H+) ratio clearly increases from the region stage. This means that the abundance ratio changes with the evolution of high-mass star-forming regions (HMSFRs). Moreover, positive correlations between the ratio and other evolutionary indicators (dust temperature, bolometric luminosity, and luminosity-to-mass ratio) are found. Thus we propose the ratio of N(HC3N)/N(N2H+) as a reliable chemical clock of HMSFRs. © 2023. The Author(s). Published by the American Astronomical Society.
International Max Planck Research School for Environmental, Cellular and Molecular Microbiology, IMPRS-Mic; National Natural Science Foundation of China, NSFC: 11590782, 12041302; China Scholarship Council, CSC This work is supported by the Natural Science Foundation of China (Nos. 12041302, 11590782). We thank the operators and staff at the IRAM 30 m and ARO 12 m telescopes for their assistance during our observations. We also thank Dr. J. Z. Wang, and Dr. X. Chen for their nice comments and suggestions. 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) for support. |
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| Дата |
2024-04-05T16:15:13Z
2024-04-05T16:15:13Z 2023 |
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| Тип |
Article
Journal article (info:eu-repo/semantics/article) |info:eu-repo/semantics/publishedVersion |
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| Идентификатор |
Wang, YX, Zhang, JS, Yu, HZ, Wang, Y, Yan, YT, Chen, JL, Zhao, JY & Zou, YP 2023, 'A Possible Chemical Clock in High-mass Star-forming Regions: N(HC3N)/N(N2H+)?', Astrophysical Journal, Supplement Series, Том. 264, № 2, 48. https://doi.org/10.3847/1538-4365/acafe6
Wang, Y. X., Zhang, J. S., Yu, H. Z., Wang, Y., Yan, Y. T., Chen, J. L., Zhao, J. Y., & Zou, Y. P. (2023). A Possible Chemical Clock in High-mass Star-forming Regions: N(HC3N)/N(N2H+)? Astrophysical Journal, Supplement Series, 264(2), [48]. https://doi.org/10.3847/1538-4365/acafe6 0067-0049 Final All Open Access, Gold, Green https://www.scopus.com/inward/record.uri?eid=2-s2.0-85147816566&doi=10.3847%2f1538-4365%2facafe6&partnerID=40&md5=c6a8a0645ca251ac6e2d097d5b57a8f8 https://iopscience.iop.org/article/10.3847/1538-4365/acafe6/pdf http://elar.urfu.ru/handle/10995/130187 10.3847/1538-4365/acafe6 85147816566 000926304600001 |
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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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| Формат |
application/pdf
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| Издатель |
American Astronomical Society
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| Источник |
The Astrophysical Journal Supplement Series
Astrophysical Journal, Supplement Series |
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