Sky reconstruction for the Tianlai cylinder array

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, transfe...

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Bibliographic Details
Published in:Research in astronomy and astrophysics 2016-10, Vol.16 (10), p.71-80
Main Authors: Zhang, Jiao, Zuo, Shi-Fan, Ansari, Reza, Chen, Xuelei, Li, Yi-Chao, Wu, Feng-Quan, Campagne, Jean-Eric, Magneville, Christophe
Format: Article
Language:English
Subjects:
Arrays
Beams (radiation)
cosmology: observation
Cylinders
Gratings (spectra)
HI intensity mapping
Interferometers
map making
method: transit telescope
Noise
Reconstruction
Transfer functions
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Summary: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.
ISSN:1674-4527
2397-6209
DOI:10.1088/1674-4527/16/10/158