Shadow of a black hole surrounded by dark matter

@article{37363,
   author = {Konoplya, Roman},
   article_number = {August},
   doi = {http://dx.doi.org/10.1016/j.physletb.2019.05.043},
   keywords = {black holes; dark matter; black-hole shadow},
   language = {eng},
   issn = {0370-2693},
   journal = {Physics Letters B},
   title = {Shadow of a black hole surrounded by dark matter},
   url = {https://www.sciencedirect.com/science/article/pii/S0370269319303648?via%3Dihub},
   volume = {795},
   year = {2019}
}

TY  - JOUR
ID  - 37363
AU  - Konoplya, Roman
PY  - 2019
TI  - Shadow of a black hole surrounded by dark matter
JF  - Physics Letters B
VL  - 795
IS  - August
SP  - 1-6
EP  - 1-6
SN  - 03702693
KW  - black holes
KW  - dark matter
KW  - black-hole shadow
UR  - https://www.sciencedirect.com/science/article/pii/S0370269319303648?via%3Dihub
L2  - https://www.sciencedirect.com/science/article/pii/S0370269319303648?via%3Dihub
N2  - 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.
ER  - 

KONOPLYA, Roman. Shadow of a black hole surrounded by dark matter. \textit{Physics Letters B}. 2019, roč.~795, August, s.~1-6. ISSN~0370-2693. Dostupné z: https://dx.doi.org/10.1016/j.physletb.2019.05.043.