Cusp summations and cusp relations of simple quad lenses
文献类型：期刊论文
| 作者 | Chu, Zhe1; Li, G. L.1; Lin, W. P.2,3 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2015-05-11 |
| 卷号 | 449期号:2页码:2079-2086 |
| 关键词 | gravitational lensing: strong methods: analytical |
| 英文摘要 | We review five often used quad lens models, each of which has analytical solutions and can produce four images at most. Each lens model has two parameters, including one that describes the intensity of non-dimensional mass density, and the other one that describes the deviation from the circular lens. In our recent work, we have found that the cusp and the fold summations are not equal to 0, when a point source infinitely approaches a cusp or a fold from inner side of the caustic. Based on the magnification invariant theory, which states that the sum of signed magnifications of the total images of a given source is a constant, we calculate the cusp summations for the five lens models. We find that the cusp summations are always larger than 0 for source on the major cusps, while can be larger or smaller than 0 for source on the minor cusps. We also find that if these lenses tend to the circular lens, the major and minor cusp summations will have infinite values, and with positive and negative signs, respectively. The cusp summations do not change significantly if the sources are slightly deviated from the cusps. In addition, through the magnification invariants, we also derive the analytical signed cusp relations on the axes for three lens models. We find that both on the major and the minor axes the larger the lenses deviated from the circular lens, the larger the signed cusp relations. The major cusp relations are usually larger than the absolute minor cusp relations, but for some lens models with very large deviation from circular lens, the minor cusp relations can be larger than the major cusp relations. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | QUADRUPOLE GRAVITATIONAL LENS ; DARK-MATTER SUBSTRUCTURES ; ANOMALOUS FLUX RATIOS ; SMALL-SCALE STRUCTURE ; MAGNIFICATION RELATIONS ; IDENTIFYING LENSES ; RX J0911.4+0551 ; GALAXIES ; MODELS ; IMAGES |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000355337500074 |
| 公开日期 | 2015-08-18 |
| 源URL | [http://119.78.226.72/handle/331011/18344]  |
| 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, Purple Mt Observ, Nanjing 210008, Peoples R China 2.Sun Yat Sen Univ, Sch Astron & Space Sci, Guangzhou 510275, Guangdong, Peoples R China 3.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chu, Zhe,Li, G. L.,Lin, W. P.. Cusp summations and cusp relations of simple quad lenses[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2015,449(2):2079-2086. |
| APA | Chu, Zhe,Li, G. L.,&Lin, W. P..(2015).Cusp summations and cusp relations of simple quad lenses.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,449(2),2079-2086. |
| MLA | Chu, Zhe,et al."Cusp summations and cusp relations of simple quad lenses".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 449.2(2015):2079-2086. |
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来源：上海天文台
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