Combining time delays and image positions for quadruple lenses: a moment approach
文献类型：期刊论文
| 作者 | Witt, Hans J.1; Mao, Shude1,2,3
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2015-09-01 |
| 卷号 | 452期号:1页码:115-122 |
| 关键词 | gravitational lensing: strong quasars: individual: RX J1131-1231 galaxies: structure |
| 英文摘要 | Time delays in gravitational lenses can be used to determine the Hubble constant and the lens potential. In future surveys, many gravitational lenses can be discovered, and their time delays and image positions can in principle be measured. Using an elliptical power-law potential, we show that combinations of image positions and time delays for quadruple lenses yield simple analytical expressions that are connected with observable quantities. These relations can be used to obtain the approximate axis ratio q, the Einstein radius and the slope. We apply this method to RX J1131-1231, and show that our analytical results match the full numerical determinations approximately. Our approach can quickly determine rough values of lens parameters, which can then be used as initial guesses for further refinement through numerical modelling and may be useful for automated lens search in large surveys. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000360851100009 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5590]  |
| 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, Beijing 100012, Peoples R China 2.Tsinghua Univ, Phys Dept & Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China 3.Univ Manchester, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, Lancs, England |
| 推荐引用方式 GB/T 7714 | Witt, Hans J.,Mao, Shude. Combining time delays and image positions for quadruple lenses: a moment approach[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2015,452(1):115-122. |
| APA | Witt, Hans J.,&Mao, Shude.(2015).Combining time delays and image positions for quadruple lenses: a moment approach.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,452(1),115-122. |
| MLA | Witt, Hans J.,et al."Combining time delays and image positions for quadruple lenses: a moment approach".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 452.1(2015):115-122. |
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来源：国家天文台
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