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Shadows and photon rings of a spherically accreting Kehagias-Sfetsos black hole

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arxiv 2307.01529 v2 pith:4TCYTANX submitted 2023-07-04 gr-qc

Mohaddese Heydari-Fard , Malihe Heydari-Fard , Nematollah Riazi This is my paper · ORCID
classification gr-qc
keywords parameterblackphotonringsshadowsaccretingaccretionflow
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By considering Kehagias-Sfetsos black hole in the framework of the Ho\v{r}ava-Lifshitz gravity, we study the optical appearance of such black holes surrounded by spherical accretion flow. For the static/infalling spherical accretion flow, we compute the observed specific intensity as a function of impact parameter. We also investigate the effect of the Ho\v{r}ava parameter and accreting matter on the luminosity of shadows and photon rings. It is found that an increase in the Ho\v{r}ava parameter decreases the shadow size, while the shadows and photon rings luminosities increase. Moreover, we constrain the Ho\v{r}ava parameter from the observational data reported by the Event Horizon Telescope for M87* and Sgr A*.

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Cited by 1 Pith paper

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  1. Testing Extended Theories of Gravity via Black Hole Photon Rings

    gr-qc 2025-05 conditional novelty 3.0 of 10

    For Konoplya-Zhidenko deformed Schwarzschild black holes, epsilon controls photon sphere, shadow, and photon ring size while a2 and b2 are observationally degenerate, and EHT data constrain epsilon to about -0.09 to 0...

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