Shadow of a black hole surrounded by dark matter

By R. Konoplya. Physics Letters B, 2019

313 citations recorded by the source corpus.

We consider a simple spherical model consisting of a Schwarzschild black hole of mass $M$ and a dark matter of mass $\Delta M$ around it. The general formula for the radius of black-hole shadow has been derived in this case. It is shown that the change of the shadow is not negligible, once the effective radius of the dark matter halo is of order $\sim \sqrt{3 M \Delta M}$. For this to happen, for example, for the galactic black hole, the dark matter must be concentrated near the black hole. For small deviations from the Schwarzschild limit, the dominant contribution into the size of a shadow is due to the dark matter under the photon sphere, but at larger deviations, the matter outside the photon sphere cannot be ignored.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/468262d01d73d852ad0b4ddb3fad416053fe2fd8

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In Astronomy and Astrophysics

Citations in the corpus

Influence of quintessence dark energy on the shadow of black hole (2020, background): “So far, the study of shadows of black holes has become a subject of great interest [12–39].”
Testing the rotational nature of the supermassive object M87* from the circularity and size of its first image (2019, background): “[71] R.”