Adaptive-scale wide-field reconstruction for radio synthesis imaging

doi:10.1051/0004-6361/202038153

CORC > 新疆天文台 > 研究单元未命名 > 射电天文研究室 > 星系宇宙学研究团组

	Adaptive-scale wide-field reconstruction for radio synthesis imaging
	Zhang, L.1,2; Mi, L. G.1; Zhang, M.3,4; Liu, X.3,4; He, C. L.2
刊名	ASTRONOMY & ASTROPHYSICS
	2020-08-14
卷号	640 页码:A80
关键词	methods: data analysis techniques: image processing
ISSN号	0004-6361
DOI	10.1051/0004-6361/202038153
产权排序	3
英文摘要	Sky curvature and non-coplanar effects, caused by low frequencies, long baselines, or small apertures in wide field-of-view instruments such as the Square Kilometre Array (SKA), significantly limit the imaging performance of an interferometric array. High dynamic range imaging essentially requires both an excellent sky model and the correction of imaging factors such as non-coplanar effects. New CLEAN deconvolution with adaptive-scale modeling already has the ability to construct significantly better narrow-band sky models. However, the application of wide-field observations based on modern arrays has not yet been jointly explored. We present a new wide-field imager that can model the sky on an adaptive-scale basis, and the sky curvature and the effects of non-coplanar observations with the w-projection method. The degradation caused by the dirty beam due to incomplete spatial frequency sampling is eliminated during sky model construction by our new method, while the w-projection mainly removes distortion of sources far from the image phase center. Applying our imager to simulated SKA data and the real observation data of the Karl G. Jansky Very Large Array (an SKA pathfinder) suggested that our imager can handle the effects of wide-field observations well and can reconstruct more accurate images. This provides a route for high dynamic range imaging of SKA wide-field observations, which is an important step forward in the development of the SKA imaging pipeline.
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资助项目	National Key R&D Program of China[2018YFA0404602] ; National Natural Science Foundation of China (NSFC)[11963003] ; Guizhou Science & Technology Plan Project (Platform Talent)[[2017]5788] ; Youth Science & Technology Talents Development Project of Guizhou Education Department[KY[2018]119] ; Youth Science & Technology Talents Development Project of Guizhou Education Department[[2018]433] ; Guizhou University Talent Research Fund[(2018)60] ; Light of West China Programme[2017-XBQNXZ-A-008]
WOS关键词	IMPLEMENTATION ; DECONVOLUTION
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	EDP SCIENCES S A
WOS记录号	WOS:000562774000005
资助机构	National Key R&D Program of China ; National Natural Science Foundation of China (NSFC) ; Guizhou Science & Technology Plan Project (Platform Talent) ; Youth Science & Technology Talents Development Project of Guizhou Education Department ; Guizhou University Talent Research Fund ; Light of West China Programme
内容类型	期刊论文
源URL	[http://ir.xao.ac.cn/handle/45760611-7/3629]
专题	星系宇宙学研究团组
通讯作者	Zhang, L.
作者单位	1.Guizhou Univ, Coll Big Data & Informat Engn, Guiyang 550025, Peoples R China 2.China West Normal Univ, Comp Sch, Nanchong 637002, Sichuan, Peoples R China 3.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China 4.Chinese Acad Sci, Key Lab Radio Astron, Urumqi 830011, Peoples R China
推荐引用方式 GB/T 7714	Zhang, L.,Mi, L. G.,Zhang, M.,et al. Adaptive-scale wide-field reconstruction for radio synthesis imaging[J]. ASTRONOMY & ASTROPHYSICS,2020,640:A80.
APA	Zhang, L.,Mi, L. G.,Zhang, M.,Liu, X.,&He, C. L..(2020).Adaptive-scale wide-field reconstruction for radio synthesis imaging.ASTRONOMY & ASTROPHYSICS,640,A80.
MLA	Zhang, L.,et al."Adaptive-scale wide-field reconstruction for radio synthesis imaging".ASTRONOMY & ASTROPHYSICS 640(2020):A80.