KONOPLYA, Roman. Shadow of a black hole surrounded by dark matter. Physics Letters B. 2019, vol. 795, August, p. 1-6. ISSN 0370-2693. Available from: https://dx.doi.org/10.1016/j.physletb.2019.05.043.
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Basic information
Original name Shadow of a black hole surrounded by dark matter
Authors KONOPLYA, Roman (804 Ukraine, guarantor, belonging to the institution).
Edition Physics Letters B, 2019, 0370-2693.
Other information
Original language English
Type of outcome Article in a journal
Field of Study 10308 Astronomy
Country of publisher Netherlands
Confidentiality degree is not subject to a state or trade secret
WWW URL
RIV identification code RIV/47813059:19240/19:A0000428
Organization unit Faculty of Philosophy and Science in Opava
Doi http://dx.doi.org/10.1016/j.physletb.2019.05.043
UT WoS 000477924000001
Keywords in English black holes; dark matter; black-hole shadow
Tags , GA19-03950S, RCTPA, RIVOK
Tags International impact, Reviewed
Links GA19-03950S, research and development project.
Changed by Changed by: RNDr. Jan Hladík, Ph.D., učo 25379. Changed: 5/3/2020 17:56.
Abstract
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 similar to root (3M 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.
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