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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
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume417Issue:3Pages:2197-2205
AbstractThe 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.
KeywordGalaxies: Haloes Dark Matter
DOI10.1111/j.1365-2966.2011.19400.x
Indexed BySCI
Language英语
WOS IDWOS:000297043600038
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8037
Collection星系宇宙学研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ China, Beijing 100012, Peoples R China
2.Univ Manchester, Jodrell Bank, Ctr Astrophys, Manchester M13 9PL, Lancs, England
Recommended Citation
GB/T 7714
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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