VLBI astrometry of radio stars to link radio and optical celestial reference frames: Observing strategies

doi:10.1093/mnras/stae705

	VLBI astrometry of radio stars to link radio and optical celestial reference frames: Observing strategies
	Zhang, Jingdong 2,3; Zhang, Bo 2; Xu, Shuangjing 2,4; Liu, Niu 1; Chen W(陈文)5,6; Ding, Hao 2; Jiang, Pengfei 7; Sun, Yan 2; Wang, Jinqing 7; Cui, Lang 2
刊名	Monthly Notices of the Royal Astronomical Society
	2024-04-01
卷号	529 期号:3 页码:2062-2070
关键词	instrumentation: interferometers methods: data analysis astrometry proper motions reference systems
ISSN号	0035-8711
DOI	10.1093/mnras/stae705
产权排序	第5完成单位
文献子类	Article
英文摘要	The Gaia celestial reference frame (Gaia-CRF) will benefit from a close assessment with independent methods, such as Very Long Baseline Interferometry (VLBI) measurements of radio stars at bright magnitudes. However, obtaining full astrometric parameters for each radio star through VLBI measurements demands a significant amount of observation time. This study proposes an efficient observing strategy that acquires double-epoch VLBI positions to measure the positions and proper motions of radio stars at a reduced cost. The solution for CRF link compatible with individual VLBI position measurements is introduced, and the optimized observing epoch scheduling is discussed. Applying this solution to observational data yields results sensitive to sample increase or decrease, yet they remain consistently in line with the literature at the 1σ level. This suggests the potential for improvement with a larger sample size. Simulations show that the double-epoch strategy reduces CRF link parameter uncertainties by over 30 per cent compared to the five-parameter strategy. © 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.
学科主题	天文学
URL标识	查看原文
出版地	GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
资助项目	N/A
WOS关键词	CATALOG ; MICROARCSECOND
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:001186406700001
资助机构	National Natural Science Foundation of China[12103026, 12373074] ; National Natural Science Foundation of China (NSFC)[2022SKA0120102] ; National SKA Program of China[2021-XBQNXZ-005] ; CAS 'Light of West China' Program
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/26563]
专题	云南天文台_射电天文研究组
作者单位	1.School of Astronomy and Space Science, Key Laboratory of Modern Astronomy and Astrophysics (Ministry of Education), Nanjing University, Nanjing, 210023, China; 2.Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai, 200030, China; 3.University of Chinese Academy of Sciences, School of Astronomy and Space Sciences, No.19 (A) Yuquan Rd, Shijingshan, Beijing, 100049, China; 4.Korea Astronomy and Space Science Institute, 776 Daedeok-daero, Yuseong-gu, Daejeon, 34055, Korea, Republic of; 5.Yunnan Observatories, Chinese Academy of Sciences, Yunnan, Kunming, 650216, China; 6.Yunnan Key Laboratory of the Solar Physics and Space Science, Kunming, 650216, China; 7.Xinjiang Astronomical Observatory, Chinese Academy of Sciences, 150 Science 1-Street, Urumqi, 830011, China
推荐引用方式 GB/T 7714	Zhang, Jingdong,Zhang, Bo,Xu, Shuangjing,et al. VLBI astrometry of radio stars to link radio and optical celestial reference frames: Observing strategies[J]. Monthly Notices of the Royal Astronomical Society,2024,529(3):2062-2070.
APA	Zhang, Jingdong.,Zhang, Bo.,Xu, Shuangjing.,Liu, Niu.,陈文.,...&Huang, Yidan.(2024).VLBI astrometry of radio stars to link radio and optical celestial reference frames: Observing strategies.Monthly Notices of the Royal Astronomical Society,529(3),2062-2070.
MLA	Zhang, Jingdong,et al."VLBI astrometry of radio stars to link radio and optical celestial reference frames: Observing strategies".Monthly Notices of the Royal Astronomical Society 529.3(2024):2062-2070.