Blind search for 21-cm absorption systems using a new generation of Chinese radio telescopes

作     者：Hao-Ran Yu Ue-Li Pen Tong-Jie Zhang Di Li Xuelei Chen 

作者机构：Kavli Institute for Astronomy & Astrophysics Peking University Beijing 100871 China Canadian Institute for Theoretical Astrophysics University of Toronto Toronto M5S 3H8 ON Canada Dunlap Institute for Astronomy and Astrophysics University of Toronto Toronto M5S 3H4 ON Canada Canadian Institute for Advanced Research Program in Cosmology and Gravitation Toronto ON M5G 1Z8 Canada Perimeter Institute for Theoretical Physics Waterloo ON N2L 2Y5 Canada Department of Astronomy Beijing Normal University Beijing 100875 China National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China Key Laboratory of Radio Astronomy Chinese Academy of Sciences Nanjing 210008 China Key Laboratory for Computational Astrophysics National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2017年第17卷第6期

页      面：1-4页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 11573006 and 11528306) General Financial (Grant No. 2015M570884) and Special Financial Grant (No. 2016T90009) from the China Postdoctoral Science Foundation support of the National Science and Engineering Research Council of Canada support from the FAST fellowship program administered by the Astronomical Mega-science center of the Chinese Academy of Sciences partially supported by the International Partnership Program of CAS, Grant No. 114A11KYSB20160008 CAS Interdisciplinary Innovation Team program 

主　　题：telescopes - surveys - cosmology observations 

摘      要：Neutral hydrogen clouds are known to exist in the Universe, however their spatial distributions and physical properties are poorly understood. Such missing information can be studied by the new generation of Chinese radio telescopes through a blind search of 21-cm absorption systems. We forecast the capabilities of surveys of 21-cm absorption systems by two representative radio telescopes in China - the Five-hundred-meter Aperture Spherical radio Telescope （FAST） and Tianlai 21-cm cosmology experiment （Tianlai）. Facilitated by either the high sensitivity （FAST） or wide field of view （Tianlai） of these telescopes, more than a thousand 21-cm absorption systems can be discovered in a few years, representing orders of magnitude improvement over the cumulative discoveries in the past half a century.