Interstellar Nitrogen Isotope Ratios: New NH3 Data from the Galactic Center out to the Perseus Arm

doi:10.3847/1538-4365/ac205a

CORC > 新疆天文台 > 研究单元未命名 > 射电天文研究室 > 恒星形成与演化研究团组

	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
刊名	ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
	2021-12-01
卷号	257 期号:2 页码:18
ISSN号	0067-0049
DOI	10.3847/1538-4365/ac205a
通讯作者	Zhang, J. S.(jszhang@gzhu.edu.cn)
英文摘要	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.
资助项目	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关键词	STAR-FORMING CORES ; ORION-KL ; AMMONIA ; FRACTIONATION ; MASER ; HOT ; NUCLEOSYNTHESIS ; MILLIMETER ; (NH3)-N-15 ; EVOLUTION
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP Publishing Ltd
WOS记录号	WOS:000722019400001
资助机构	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
内容类型	期刊论文
源URL	[http://ir.xao.ac.cn/handle/45760611-7/4362]
专题	恒星形成与演化研究团组
通讯作者	Zhang, J. S.
作者单位	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
推荐引用方式 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):18.
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),18.
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):18.