A Systematic Observational Study on Galactic Interstellar Ratio 18O/17O. II. C18O and C17O J=2-1 Data Analysis

doi:10.3847/1538-4365/acee6b

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	A Systematic Observational Study on Galactic Interstellar Ratio ¹⁸O/¹⁷O. II. C¹⁸O and C¹⁷O J=2-1 Data Analysis
	Zou, Y. P.1; Zhang, J. S.1; Henkel, C.2,3,4 ; Romano, D.5; Liu, W.1; Zheng, Y. H.6,7; Yan, Y. T.2; Chen, J. L.1; Wang, Y. X.1; Zhao, J. Y.1
	2023-10-01
Source Publication	ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
ISSN	0067-0049
Volume	268 Issue:2 Pages:56
Contribution Rank	4
Abstract	To investigate the relative amount of ejecta from high-mass versus intermediate-mass stars and to trace the chemical evolution of the Galaxy, we have performed a systematic study of Galactic interstellar O-18/O-17 ratios toward a sample of 421 molecular clouds with IRAM 30 m and the 10 m Submillimeter Telescope, covering a galactocentric distance range of similar to 1-22 kpc. The results presented in this paper are based on the J = 2-1 transition and encompass 364 sources showing both (CO)-O-18 and (CO)-O-17 detections. The previously suggested O-18/O-17 gradient is confirmed. For the 41 sources detected with both facilities, good agreement is obtained. A correlation of the O-18/O-17 ratios with heliocentric distance is not found, indicating that beam dilution and linear beam sizes are not relevant. For the subsample of IRAM 30 m high-mass star-forming regions with accurate parallax distances, an unweighted fit gives O-18/O-17 = (0.12 +/- 0.02)R-GC + (2.38 +/- 0.13) with a correlation coefficient of R = 0.67. While the slope is consistent with our J = 1-0 measurement, the ratios are systematically lower. This should be caused by larger optical depths of (CO)-O-18 2-1 lines with respect to the corresponding 1-0 transitions, which is supported by RADEX calculations and the fact that (CO)-O-18/(CO)-O-17 is positively correlated with (CO)-C-13/(CO)-O-18. When we consider that optical depth effects with (CO)-O-18 J = 2-1 typically reach an optical depth of similar to 0.5, the corrected O-18/O-17 ratios from the J = 1-0 and J = 2-1 lines are consistent. A good numerical fit to the data is provided by the MWG-12 model, which includes both rotating stars and novae.
DOI	10.3847/1538-4365/acee6b
Indexed By	SCI
Language	英语
WOS Keyword	STAR-FORMING REGIONS ; ROTATING MASSIVE STARS ; TRIGONOMETRIC PARALLAXES ; WATER MASER ; ABUNDANCES ; SOLAR ; MILLIMETER ; GRADIENT ; NITROGEN ; SPECTRA
Funding Project	This work is supported by the National Key Ramp ; D program of China (2022YFA1603102) and the Natural Science Foundation of China (No. 12373021, 12041302, 11590782). D.R. thanks the Italian National Institute for Astrophysics (INAF) for the support provided[2022YFA1603102] ; National Key Ramp ; D program of China[12373021] ; National Key Ramp ; D program of China[12041302] ; National Key Ramp ; D program of China[11590782] ; Natural Science Foundation of China[2022] ; Natural Science Foundation of China[~1.05.12.06.08] ; Italian National Institute for Astrophysics (INAF)
WOS Research Area	Astronomy & Astrophysics
WOS Subject	Astronomy & Astrophysics
WOS ID	WOS:001077645500001
Publisher	IOP Publishing Ltd
Funding Organization	This work is supported by the National Key Ramp ; D program of China (2022YFA1603102) and the Natural Science Foundation of China (No. 12373021, 12041302, 11590782). D.R. thanks the Italian National Institute for Astrophysics (INAF) for the support provided ; National Key Ramp ; D program of China ; Natural Science Foundation of China ; Italian National Institute for Astrophysics (INAF)
Citation statistics	Cited Times:2[WOS] [WOS Record] [Related Records in WOS]
Document Type	期刊论文
Identifier	http://ir.xao.ac.cn/handle/45760611-7/5536
Collection	中国科学院新疆天文台射电天文研究室_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.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China 5.INAF, Osservatorio Astrofis & Sci Spazio, Via Gobetti 93-3, I-40129 Bologna, Italy 6.Chinese Acad Sci, Natl Astron Observ, Beijing, Peoples R China 7.Univ Chinese Acad Sci, People's Republ China, Beijing, Peoples R China
Recommended Citation GB/T 7714	Zou, Y. P.,Zhang, J. S.,Henkel, C.,et al. A Systematic Observational Study on Galactic Interstellar Ratio ¹⁸O/¹⁷O. II. C¹⁸O and C¹⁷O J=2-1 Data Analysis[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2023,268(2):56.
APA	Zou, Y. P..,Zhang, J. S..,Henkel, C..,Romano, D..,Liu, W..,...&Zhao, J. Y..(2023).A Systematic Observational Study on Galactic Interstellar Ratio ¹⁸O/¹⁷O. II. C¹⁸O and C¹⁷O J=2-1 Data Analysis.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,268(2),56.
MLA	Zou, Y. P.,et al."A Systematic Observational Study on Galactic Interstellar Ratio ¹⁸O/¹⁷O. II. C¹⁸O and C¹⁷O J=2-1 Data Analysis".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 268.2(2023):56.

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