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Strong gravitational lensing around Kehagias–Sfetsos compact objects surrounded by plasma

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Abstract

We present the analysis how Hořava gravity and plasma influence the strong lensing phenomena around Kehagias–Sfetsos (KS) black holes. Using the semi-analytical Bozza method of strong lensing limit, we determine the multiple images, namely their separation S, and magnification R. We apply our calculations to the case of supermassive black hole having mass \(M=6.5\times 10^{9}\text {M}_\odot \) and being at distance \(d_0=16.8\text {Mpc}\) from observer corresponding to those observed in M87. We show that the sensitivity of image magnification, image separation, and shadow angular size on KS parameter \(\omega \) and plasma parameter k are of order from 1 to \(10\%\) for R and \(~\,16\%\) for S.

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Acknowledgements

We acknowledge the institutional support of Silesian University in Opava and Grant No. SGS/12/2019. A. A. is supported by PIFI fund of Chinese Academy of Sciences. J.S. and Z.S. acknowledge the support of the Grant 19-03950S of Czech Science Foundation (GAC̈R). AA thanks the Grant of Ministry for Innovative Development of Uzbekistan F-FA-2021-510.

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Authors and Affiliations

  1. Research Centre for Theoretical Physics and Astrophysics, Institute of Physics in Opava, Silesian University in Opava, Bezruc̃ovo náměsti 13, 74601, Opava, Czech Republic

    Sudipta Hensh, Jan Schee & Zdeněk Stuchlík

  2. Ulugh Beg Astronomical Institute, Astronomy St. 33, 100052, Tashkent, Uzbekistan

    Ahmadjon Abdujabbarov

  3. Shanghai Astronomical Observatory, 80 Nandan Road, Shanghai, 200030, People’s Republic of China

    Ahmadjon Abdujabbarov

  4. Institute of Nuclear Physics, Ulugbek 1, 100214, Tashkent, Uzbekistan

    Ahmadjon Abdujabbarov

  5. National University of Uzbekistan, 100174, Tashkent, Uzbekistan

    Ahmadjon Abdujabbarov

  6. Institute of Fundamental and Applied Research of National Research University TIIAME, Kori Niyoziy, 39, 100000, Tashkent, Uzbekistan

    Ahmadjon Abdujabbarov

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  1. Sudipta Hensh
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  2. Jan Schee
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  4. Zdeněk Stuchlík
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Hensh, S., Schee, J., Abdujabbarov, A. et al. Strong gravitational lensing around Kehagias–Sfetsos compact objects surrounded by plasma. Eur. Phys. J. Plus 137, 242 (2022). https://doi.org/10.1140/epjp/s13360-022-02454-8

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