Estimation of halo ellipticity as a function of radius with flexions
文献类型：期刊论文
| 作者 | Er, Xinzhong1; Mao, Shude1,2 ; Xu, Dandan1; Cao, Yixian1
|
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2011-11-01 |
| 卷号 | 417期号:3页码:2197-2205 |
| 关键词 | galaxies: haloes dark matter |
| 英文摘要 | 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. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000297043600038 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/8037]  |
| 专题 | 国家天文台_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 |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：国家天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。