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Estimation of halo ellipticity as a function of radius with flexions
Er, Xinzhong1; Mao, Shude1,2; Xu, Dandan1; Cao, Yixian1
2011-11-01
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷号417期号:3页码:2197-2205
摘要The cold dark matter theory predicts triaxial dark matter haloes. The radial distribution of halo ellipticity depends on baryonic processes and the nature of dark matter particles (collisionless or collisional). Here we show that we can use lensing flexion ratios to measure the halo ellipticity as a function of radius. We introduce a weight function and study the relationship between the first- and second-order statistics of flexion ratios, both of which can be used to reduce the bias in the estimation of ellipticity. We perform numerical tests for our method, and demonstrate that it can reduce the bias and determine the halo ellipticity as a function of radius. We also point out that the minimum mean flexion ratio can be used to trace the centres of galaxy clusters.
关键词Galaxies: Haloes Dark Matter
DOI10.1111/j.1365-2966.2011.19400.x
收录类别SCI
语种英语
WOS记录号WOS:000297043600038
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被引频次:5[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8037
专题星系宇宙学研究部
作者单位1.Chinese Acad Sci, Natl Astron Observ China, Beijing 100012, Peoples R China
2.Univ Manchester, Jodrell Bank, Ctr Astrophys, Manchester M13 9PL, Lancs, England
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Er, Xinzhong,Mao, Shude,Xu, Dandan,et al. Estimation of halo ellipticity as a function of radius with flexions[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2011,417(3):2197-2205.
APA Er, Xinzhong,Mao, Shude,Xu, Dandan,&Cao, Yixian.(2011).Estimation of halo ellipticity as a function of radius with flexions.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,417(3),2197-2205.
MLA Er, Xinzhong,et al."Estimation of halo ellipticity as a function of radius with flexions".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 417.3(2011):2197-2205.
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