Sky reconstruction for the Tianlai cylinder array  

作　　者：Jiao Zhang Shi-Fan Zuo Reza Ansari Xuelei Chen Yi-Chao Li Feng-Quan Wu Jean-Eric Campagne Christophe Magneville 

机构地区：[1]Key Laboratory of Computational Astrophysics,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100012,China [2]Universite Paris-Sud,LAL,UMR 8607,F-91898 Orsay Cedex,France&CNRS/IN2P3,F-91405 Orsay,France [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]Center for High Energy Physics,Peking University,Beijing 100871,China [5]CEA,DSM/IRFU,Centre d'Etudes de Saclay,F-91191 Gif-sur-Yvette,France

出　　处：《Research in Astronomy and Astrophysics》2016年第10期71-80,共10页天文和天体物理学研究（英文版）

基　　金：supported by the MOST 863 program(Grant 2012AA121701);the CAS Repair and Procurement grant;supported by PNCG,Observatoire de Paris,Irfu/CEA and LAL/CNRS;supported by the China Scholarship Council;supported by the CAS Strategic Priority Research Program(XDB09020301);the National Natural Science Foundation of China(NSFC,Grant 11373030);supported by the NSFC(Grant 11473044)

摘　　要：We apply our sky map reconstruction method for transit type interferometers to the Tianlai cylin- der array. The method is based on spherical harmonic decomposition, and can be applied to a cylindrical array as well as dish arrays and we can compute the instrument response, synthesized beam, transfer func- tion and noise power spectrum. We consider cylinder arrays with feed spacing larger than half a wavelength and, as expected, we find that the arrays with regular spacing have grating lobes which produce spurious images in the reconstructed maps. We show that this problem can be overcome using arrays with a different feed spacing on each cylinder. We present the reconstructed maps, and study the performance in terms of noise power spectrum, transfer function and beams for both regular and irregular feed spacing configura- tions.We apply our sky map reconstruction method for transit type interferometers to the Tianlai cylin- der array. The method is based on spherical harmonic decomposition, and can be applied to a cylindrical array as well as dish arrays and we can compute the instrument response, synthesized beam, transfer func- tion and noise power spectrum. We consider cylinder arrays with feed spacing larger than half a wavelength and, as expected, we find that the arrays with regular spacing have grating lobes which produce spurious images in the reconstructed maps. We show that this problem can be overcome using arrays with a different feed spacing on each cylinder. We present the reconstructed maps, and study the performance in terms of noise power spectrum, transfer function and beams for both regular and irregular feed spacing configura- tions.

关 键 词：cosmology： observation -- HI intensity mapping -- method： transit telescope -- map making 

分 类 号：P159.4[天文地球—天文学]