MG12 - Talk detail |
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Participant |
Tsupko, Oleg | |
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Institution |
Space Research Institute of Russian Academy of Science - Profsoyuznaya 84/32 - Moscow - Russia - Russia | |
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Session |
Talk |
Abstract |
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BHT3 |
Strong gravitational lensing and influence of plasma |
When a gravitating body is surrounded by a plasma, the lensing angle depends on the frequency of the electromagnetic wave due to refraction properties, and the dispersion properties of light propagation in the plasma. The last effect leads to a frequency dependence, even in the uniform plasma, of the lensing angle, which resembles the properties of a refractive prism spectrometer. The strongest action of this spectrometer is for the frequencies slightly exceeding the plasma frequency, which corresponds to very long radiowaves. We discuss a possibility of observation of this effect by the planned VLBI space project Radioastron. We also consider the strong gravitational lensing by Schwarzschild black holes. |