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A METHOD TO EXTRACT THE ANGULAR POWER SPECTRUM OF THE EPOCH OF REIONIZATION FROM LOW-FREQUENCY RADIO INTERFEROMETERS

文献类型：期刊论文

作者Zheng, Qian1,2; Wu, Xiang-Ping1,3; Gu, Jun-Hua1; Wang, Jingying3; Xu, Haiguang3
刊名ASTROPHYSICAL JOURNAL LETTERS
出版日期2012-10-10
卷号758期号:1
关键词cosmology: theory diffuse radiation intergalactic medium methods: data analysis techniques: interferometric
英文摘要The redshifted 21 cm signal of neutral hydrogen from the epoch of reionization (EoR) is extremely weak and its first detection is therefore expected to be statistical with first-generation low-frequency radio interferometers. In this Letter, we propose a method to extract the angular power spectrum of the EoR from the visibility correlation coefficients p(ij) (u, v), instead of the visibilities V-ij (u, v) measured directly by radio interferometers in conventional algorithm. The visibility correlation coefficients are defined as p(ij) (u, v) = V-ij (u, v)/root vertical bar V-ii parallel to V-jj vertical bar by introducing the autocorrelation terms V-ii and V-jj such that the angular power spectrum C-l can be obtained through Cl = T-0(2), independently of the primary beams of antennas. This also partially removes the influence of receiver gains in the measurement of C-l because the amplitudes of the gains cancel each other out in the statistical average operation of . We use the average system temperature T-0 as a calibrator of C-l, which is dominated by the Milky Way and extragalactic sources in the frequency range that we are interested in, below 200 MHz. Finally, we demonstrate the feasibility of this novel method using the simulated sky maps as targets and the 21 CentiMeter Array (21CMA) as interferometer.
收录类别SCI
语种英语
WOS记录号WOS:000309542200024
源URL[http://ir.bao.ac.cn/handle/114a11/6134]  
专题国家天文台_星系宇宙学研究部
作者单位1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
3.Shanghai Jiao Tong Univ, Dept Phys, Shanghai 200240, Peoples R China
推荐引用方式
GB/T 7714		 Zheng, Qian,Wu, Xiang-Ping,Gu, Jun-Hua,et al. A METHOD TO EXTRACT THE ANGULAR POWER SPECTRUM OF THE EPOCH OF REIONIZATION FROM LOW-FREQUENCY RADIO INTERFEROMETERS[J]. ASTROPHYSICAL JOURNAL LETTERS,2012,758(1).
APA Zheng, Qian,Wu, Xiang-Ping,Gu, Jun-Hua,Wang, Jingying,&Xu, Haiguang.(2012).A METHOD TO EXTRACT THE ANGULAR POWER SPECTRUM OF THE EPOCH OF REIONIZATION FROM LOW-FREQUENCY RADIO INTERFEROMETERS.ASTROPHYSICAL JOURNAL LETTERS,758(1).
MLA Zheng, Qian,et al."A METHOD TO EXTRACT THE ANGULAR POWER SPECTRUM OF THE EPOCH OF REIONIZATION FROM LOW-FREQUENCY RADIO INTERFEROMETERS".ASTROPHYSICAL JOURNAL LETTERS 758.1(2012).

入库方式： OAI收割

来源：国家天文台

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