Lensing by a singular isothermal sphere and a black hole
文献类型：期刊论文
| 作者 | Mao, Shude1,2 ; Witt, Hans J.
|
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2012-02-01 |
| 卷号 | 420期号:1页码:792-799 |
| 关键词 | black hole physics gravitational lensing: strong galaxies: elliptical and lenticular, cD galaxies: structure |
| 英文摘要 | Most galaxies host central supermassive black holes. As two galaxies merge, the black holes also merge. The final single black hole may suffer a kick due to asymmetric gravitational radiation and may not be at the centre of the galaxy; off-centre black holes may also be produced by other means such as sustained acceleration due to asymmetric jet power. We model the main galaxy as a singular isothermal sphere and the black hole as an off-centre point lens, and study the critical curves and caustics using complex notation. We identify the critical parameters that govern the transitions in the topology of critical curves, caustics and pseudo-caustics, and find that the number of images can be 2, 3, 4 and 5. We show examples of image configurations, including cases where three highly de-magnified images are found close to the centre. The perturbation on the image magnification due to the black hole scales linearly with its mass in the off-centre case, and quadratically when the black hole is at the centre. Such images are difficult to observe unless high-contrast and high-resolution imaging facilities (e. g. the Square Kilometre Array in the radio) become available. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000301284600081 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6276]  |
| 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.Univ Manchester, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, Lancs, England |
| 推荐引用方式 GB/T 7714 | Mao, Shude,Witt, Hans J.. Lensing by a singular isothermal sphere and a black hole[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2012,420(1):792-799. |
| APA | Mao, Shude,&Witt, Hans J..(2012).Lensing by a singular isothermal sphere and a black hole.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,420(1),792-799. |
| MLA | Mao, Shude,et al."Lensing by a singular isothermal sphere and a black hole".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 420.1(2012):792-799. |
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来源：国家天文台
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