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Review

Visible Shapes of Black Holes M87* and SgrA*

1
Institute for Nuclear Research of the Russian Academy of Sciences, 117312 Moscow, Russia
2
International Centre for Theoretical Physics (ICTP), Strada Costiera 11, 34151 Trieste (TS), Italy
3
Scuola Internazionale Superiore di Studi Avanzati (SISSA), Via Bonomea 265, 34136 Trieste (TS), Italy
*
Author to whom correspondence should be addressed.
Universe 2020, 6(9), 154; https://doi.org/10.3390/universe6090154
Received: 28 July 2020 / Revised: 13 September 2020 / Accepted: 15 September 2020 / Published: 21 September 2020
We review the physical origins for possible visible images of the supermassive black hole M87* in the galaxy M87 and SgrA* in the Milky Way Galaxy. The classical dark black hole shadow of the maximal size is visible in the case of luminous background behind the black hole at the distance exceeding the so-called photon spheres. The notably smaller dark shadow (dark silhouette) of the black hole event horizon is visible if the black hole is highlighted by the inner parts of the luminous accreting matter inside the photon spheres. The first image of the supermassive black hole M87*, obtained by the Event Horizon Telescope collaboration, shows the lensed dark image of the southern hemisphere of the black hole event horizon globe, highlighted by accreting matter, while the classical black hole shadow is invisible at all. A size of the dark spot on the Event Horizon Telescope (EHT) image agrees with a corresponding size of the dark event horizon silhouette in a thin accretion disk model in the case of either the high or moderate value of the black hole spin, a0.75. View Full-Text
Keywords: gravitation; astrophysics; black holes gravitation; astrophysics; black holes
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MDPI and ACS Style

Dokuchaev, V.I.; Nazarova, N.O. Visible Shapes of Black Holes M87* and SgrA*. Universe 2020, 6, 154. https://doi.org/10.3390/universe6090154

AMA Style

Dokuchaev VI, Nazarova NO. Visible Shapes of Black Holes M87* and SgrA*. Universe. 2020; 6(9):154. https://doi.org/10.3390/universe6090154

Chicago/Turabian Style

Dokuchaev, Vyacheslav I., and Natalia O. Nazarova 2020. "Visible Shapes of Black Holes M87* and SgrA*" Universe 6, no. 9: 154. https://doi.org/10.3390/universe6090154

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