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VLBI with SKA:Possible Arrays and Astrometric Science

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The next generation of very long baseline interferometry(VLBI)is stepping into the era of microarcsecond(μas)astronomy,and pushing astronomy,especially astrometry,to new heights.VLBI with the Square Kilometre Array(SKA),SKA-VLBI,will increase current sensitivity by an order of magnitude,and reach astrometric precision routinely below 10 μas,even challenging 1 μas.This advancement allows precise parallax and proper motion measurements of various celestial objects.Such improvements can be used to study objects(including isolated objects,and binary or multiple systems)in different stellar stages(such as star formation,main-sequence stars,asymptotic giant branch stars,pulsars,black holes,white dwarfs,etc.),unveil the structure and evolution of complex systems(such as the Milky Way),benchmark the international celestial reference frame,and reveal cosmic expansion.Furthermore,the theory of general relativity can also be tested with SKA-VLBI using precise measurements of light deflection under the gravitational fields of different solar system objects and the perihelion precession of solar system objects.

astrometryparallaxesstars:kinematics and dynamicsISM:kinematics and dynamicsGalaxy:kinematics and dynamicsgalaxies:kinematics and dynamicsgravitation

Yingjie Li、Ye Xu、Jingjing Li、Shuaibo Bian、Zehao Lin、Chaojie Hao、Dejian Liu

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Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210023,China

University of Science and Technology of China,Hefei 230026,China

National Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)Natural Science Foundation of Jiangsu ProvinceNational SKA Program of ChinaEntrepreneurship and Innovation Program of Jiangsu ProvinceKey Laboratory for Radio Astronomy,CAS

1220310411933011BK202109992022SKA0120103

2024

10.1088/1674-4527/ad420c

天文和天体物理学研究
中国科学院国家天文台

天文和天体物理学研究

CSTPCD
影响因子：0.406
ISSN：1674-4527
年,卷(期)：2024.24(7)