| Autor: |
A. Witzel, Thomas P. Krichbaum, T. Beckert, J. A. Zensus, Giuseppe Cimo, Silke Britzen, Alexander Kraus, Xi-Zhen Zhang, Shan-Jie Qian, Lars Fuhrmann |
| Rok vydání: |
2006 |
| Předmět: |
|
| Zdroj: |
Chinese Journal of Astronomy and Astrophysics. 6:1-14 |
| ISSN: |
1009-9271 |
| DOI: |
10.1088/1009-9271/6/1/001 |
| Popis: |
A very rapid polarization position angle swing of ∼ 180 ◦ (with a time scale of ∼6 hours) observed at 2cm in QSO1150+812 (z = 1.25) was reported by Kochenov & Gabuzda. This very rare event is difficult to explain. We found a pos- sible interpretation in the framework of a source model consisting of three polarized components, in which two compact polarized components are nearly simultaneously occulted by an interstellar cloud, with consequent focusing-defocusing effects. A spe- cific plasma-lens model is proposed which can reasonably fit the polarized flux density curve with results derived for the two lensed components. Some physical parameters of the plasma-lens and the source components are estimated. The two compact po- larized components are estimated to have brightness temperatures of ∼ 6 × 10 12 K. Thus a bulk relativistic motion with a Lorentz factor less than 10 is required to meet the inverse-Compton limit. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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