Studies of strong gravitational fields near super-massive black hole horizons with space missions |
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| Authors: | Alexander F. Zakharov Francesco De Paolis Gabriele Ingrosso Achille Nucita Asghar Qadir |
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| Affiliation: | 1. National Astronomical Observatories of Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, China;2. Institute Theoretical and Experimental Physics, B. Cheremushkinskaya, 25, Moscow 117259, Russia;3. Bogoliubov Laboratory for Theoretical Physics, Joint Institute for Nuclear Research, Joliot-Curie 6, 141980 Dubna, Moscow Region, Russia;4. XMM-Newton Science Operations Centre, ESAC, ESA, PO Box 50727, 28080 Madrid, Spain;5. Center of Advanced Mathematics and Physics, National University of Sciences and Technology, Peshawar Road, Rawalpindi 4600, Pakistan |
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| Abstract: | General relativity (GR) can be probed by several tests in the weak gravitational field limit. On the contrary, very poor information exists about GR tests in strong gravitational fields. Here, we focus on the interaction of light rays with the strong gravitational field of a massive black hole and show that relativistic images may form. Hence, we calculate the shapes of shadows (mirages) forming just near BH horizons and discuss the possibility to estimate the black hole parameters (mass, spin and charge) by future astrometric missions. In 2007, the Radioastron space telescope will be launched and it will allow to evaluate those parameters for the black hole hosted at the center of our Galaxy. |
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| Keywords: | General relativity Tests of general relativity Gravitational lenses Black holes Astrometry VLBI Space missions |
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