摘要
在继承平方公里阵列(Square Kilometre Array,SKA)望远镜的中国低频探路者——"宇宙第一缕曙光"探测项目21CMA在十年间所积累的经验和广泛国际合作的基础上,计划小规模改造现有设备,迅速掌握数字多波束合成、高动态大视场成像、前景去除等SKA低频成像的关键核心技术。同时,与SKA低频阵(SKA-low)先导设备MWA(Murchison Widefield Array)开展深层次合作,预选未来用于SKA1-low宇宙再电离深度成像的观测候选区域,为最终利用SKA第一阶段(SKA1)低频阵列,对选定观测候选区域进行深度定点观测做好充分准备,最终实现SKA1既定的首要科学目标。该项目还将建设中国SKA区域中心数据处理原型样机,并以21CMA和MWA实测数据为基础,完成低频射电干涉成像的数据处理流程,为建设中国SKA区域数据中心打下基础。
On the basis of more than 10 years of operational experience of 21CMA, the SKA low-frequency pathfinder built in northwest of China dedicate for Epoch of Reionization(Eo R) exploration, and extensive international cooperation on SKA project, the present program plans to make small-scale reformation of the existing 21CMA equipment in order to quickly grasp digital multi-beam forming, high-dynamic-range wide-field imaging, and Eo R foreground removal techniques. In-depth cooperation with SKA-low precursor, the Murchison Widefield Array(MWA) is highly desirable in science and related technique. One of the major on-going tasks is preliminarily selecting the sky zones for deep imaging and for future Eo R observation. This will eventually used as the targeted sky zones of the SKA phase one(SKA1) low frequency array in the Cosmic dawn and Eo R research, with ultimate goal of achieving the SKA key science objectives. A prototype of China SKA Regional Center data processor will be designed and constructed. The low-frequency synthesis imaging pipeline will be developed. All these pioneer work will pave the road toward the China SKA Regional Center.
引文
[1]Schilizzi R T.Proceedings of SPIE,2004,5489:62
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[3]武向平.中国参加SKA(第一阶段)综合论证报告(初稿).上海:SKA中国办公室,2018
[4]叶叔华,武向平.我国低频射电天文学学科发展战略咨询研究报告,中国科学院学部咨询报告.北京:中国科学院,2018