PT2 - Gravitational lensing and shadows |
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Speaker |
Zakharov, Alexander |
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Coauthors |
Jaluvkova, Pavlina; Stuchlik, Zdenek; Tursunov, Arman |
| Talk Title |
Shadows for Reissner--Nordstrom -- de-Sitter dyon black holes |
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Abstract |
We consider photon geodesics in the Reissner--Nordstrom -- de-Sitter dyon metric. Critical impact parameters for photon geodesics separate capture and scattering regions and the parameters characterize shadow sizes (radii). In paper (Zakharov, 2014) critical impact parameters for ~\RN~ black hole (including Reissner--Nordstrom -- de-Sitter metric with a tidal charge) have been derived analytically while shadow sizes for Schwarzschild -- de Sitter (Kottler) metric have been found in papers (Stuchlik 1983, Zakharov, 2014). In the paper we obtain analytical expressions for the shadow radii of the Reissner--Nordstrom -- de-Sitter black holes and discuss the critical values of relevant parameters, therefore, we generalize results discussed earlier in papers (Zakharov, 2014; Stuchlik 1983). Assuming that such Reissner--Nordstrom -- de-Sitter dyon black holes are located in the Galactic Center and centers of other galaxies (including M87, for instance) one could use the results to analyze current and future observational data obtained with advanced observational facilities such as the Event Horizon Telescope. |
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