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Lensing of 21-cm absorption haloes of z similar to 2-30 first galaxies

文献类型：期刊论文

作者Zhang, Pengjie; Zheng, Zheng; Cen, Renyue
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期2007-12-11
卷号382期号:3页码:1087-1093
关键词gravitational lensing cosmology theory large-scale structure of Universe
英文摘要Extended 21-cm absorption regions ( dubbed '21-cm absorption haloes') around first galaxies at z similar to 30 are likely the first distinctive structures accessible to radio observations. Though the radio array capable of detecting and resolving them must have similar to 200 km(2) total collecting area, given the great impact of such detections to the understanding of the reionization process and cosmology, such radio survey would be extremely profitable. As an example, we point out a potentially useful byproduct of such survey. The resolved 21-cm absorption 'haloes', likely close to spherical, can serve as ( almost) ideal sources for measuring the cosmic shear and mapping the matter distribution to z similar to 30. We investigate the expected lensing signal and consider a variety of noise contributions on the shear measurement. We find that signal-to-noise ratio (S/N) similar to 1 can be achieved for individual 'haloes'. Given millions of 21-cm absorption 'haloes' across the sky, the total S/N will be comparable to traditional shear measurement of similar to 109 galaxies at z similar to 1.
WOS标题词Science & Technology ; Physical Sciences
类目[WOS]Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics
关键词[WOS]LARGE-SCALE STRUCTURE ; POWER SPECTRA ; COSMIC SHEAR ; WEAK ; REIONIZATION ; RECONSTRUCTION ; FLUCTUATIONS ; EPOCH ; PROBE
收录类别SCI
语种英语
WOS记录号WOS:000251252600013
源URL[http://119.78.226.72/handle/331011/19452]  
专题上海天文台_星系宇宙学重点实验室
作者单位1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
2.Inst Adv Study, Princeton, NJ 08540 USA
3.Princeton Univ, Princeton Univ Observ, Princeton, NJ 08544 USA
推荐引用方式
GB/T 7714		 Zhang, Pengjie,Zheng, Zheng,Cen, Renyue. Lensing of 21-cm absorption haloes of z similar to 2-30 first galaxies[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2007,382(3):1087-1093.
APA Zhang, Pengjie,Zheng, Zheng,&Cen, Renyue.(2007).Lensing of 21-cm absorption haloes of z similar to 2-30 first galaxies.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,382(3),1087-1093.
MLA Zhang, Pengjie,et al."Lensing of 21-cm absorption haloes of z similar to 2-30 first galaxies".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 382.3(2007):1087-1093.

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来源：上海天文台

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