Effects of plasma on gravitational lensing
文献类型：期刊论文
| 作者 | Er, Xinzhong1; Mao, Shude1,2
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2014 |
| 卷号 | 437期号:3页码:2180-2186 |
| 关键词 | gravitational lensing: strong gravitational lensing: weak plasmas |
| 英文摘要 | We study gravitational lensing when plasma surrounds the lens. An extra deflection angle is induced by the plasma in addition to the deflection generated by gravity. An inhomogeneous plasma distribution generates a greater effect than a homogeneous one, and may cause significant effects to be detected in low-frequency radio observations (a few hundred MHz). In particular, the lensed image positions will be different for optical and radio observations. The change of position due to a plasma can reach a few tens of milliarcsec, which is readily detectable. One can use the position difference in different frequencies to estimate the density of plasma in the lens. The magnification ratios between multiple images are mainly determined by other properties of the lens, and are only weakly affected by the plasma. More importantly, we find that the strong-lensing time delay will be affected by the plasma. Estimation of the Hubble constant from the time delay in low-frequency radio observation may be slightly biased due to plasma in the lens. Unfortunately, the ionosphere of the Earth strongly affects low-frequency radio observations. Thus, our ability to detect the effect depends on how well we are able to calibrate out the ionosphere. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000329158900010 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6430]  |
| 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 | Er, Xinzhong,Mao, Shude. Effects of plasma on gravitational lensing[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2014,437(3):2180-2186. |
| APA | Er, Xinzhong,&Mao, Shude.(2014).Effects of plasma on gravitational lensing.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,437(3),2180-2186. |
| MLA | Er, Xinzhong,et al."Effects of plasma on gravitational lensing".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 437.3(2014):2180-2186. |
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来源：国家天文台
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