Refractive focusing of interstellar clouds and intraday polarization angle swings
文献类型：期刊论文
| 作者 | Qian, Shan-Jie; Krichbaum, T. P.; Gao, Long; Zhang, Xi-Zhen; Witzel, A.; Zensus, J. A. |
| 刊名 | CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
 |
| 出版日期 | 2007 |
| 卷号 | 7期号:2页码:215-223 |
| 关键词 | radio continuum : galaxies polarization : intraday variability scattering : refractive focusing quasars : individual : QSO 0917+624 |
| 英文摘要 | Intraday variations of compact extragalactic radio sources in flux density and polarization are generally interpreted in terms of refractive scintillation from the continuous interstellar medium of our Galaxy. However, continuous polarization angle swings of similar to 180 degrees (for example, the one observed in the QSO 0917+624) could not be interpreted in this way. Qian et al. have shown that the polarization angle swing observed in the QSO 1150+812 can be explained in terms of focusing-defocusing effect by an interstellar cloud, which occults two closely-placed polarized components. Here we further show that the polarization angle swing event observed in the QSO 0917+624 can also be explained in this way. We also found evidence for the cloud eclipsing a non-polarized (core) component during a short period outside the swing. A particular (and specific) plasma-lens model is proposed to model-fit the polarization swing event of 0917+624. Some physical parameters related to the plasma-lens and the source components are estimated. The brightness temperatures of the two lensed components are estimated to be similar to 1.6 x 10(13) K. Thus bulk relativistic motion with a Lorentz factor less than similar to 20 may be sufficient to avoid the inverse - Compton catastrophe. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000246129300005 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7280]  |
| 专题 | 国家天文台_射电天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Max Planck Inst Radioastron, D-53121 Bonn, Germany |
| 推荐引用方式 GB/T 7714 | Qian, Shan-Jie,Krichbaum, T. P.,Gao, Long,et al. Refractive focusing of interstellar clouds and intraday polarization angle swings[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2007,7(2):215-223. |
| APA | Qian, Shan-Jie,Krichbaum, T. P.,Gao, Long,Zhang, Xi-Zhen,Witzel, A.,&Zensus, J. A..(2007).Refractive focusing of interstellar clouds and intraday polarization angle swings.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,7(2),215-223. |
| MLA | Qian, Shan-Jie,et al."Refractive focusing of interstellar clouds and intraday polarization angle swings".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 7.2(2007):215-223. |
入库方式： OAI收割
来源：国家天文台
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