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Open AccessArticle

The Brightest Point in Accretion Disk and Black Hole Spin: Implication to the Image of Black Hole M87*

1
Institute for Nuclear Research of the Russian Academy of Sciences, Moscow 117312, Russia
2
Moscow Institute of Physics and Technology, 9 Institutskiy per., Dolgoprudny, Moscow 141700, Russia
3
Scuola Internazionale Superiore di Studi Avanzati (SISSA), Via Bonomea 265, 34136 Trieste (TS), Italy
*
Author to whom correspondence should be addressed.
Universe 2019, 5(8), 183; https://doi.org/10.3390/universe5080183
Received: 15 June 2019 / Revised: 24 July 2019 / Accepted: 30 July 2019 / Published: 5 August 2019
(This article belongs to the Special Issue Black Hole Physics and Astrophysics)
We propose the simple new method for extracting the value of the black hole spin from the direct high-resolution image of black hole by using a thin accretion disk model. In this model, the observed dark region on the first image of the supermassive black hole in the galaxy M87, obtained by the Event Horizon Telescope, is a silhouette of the black hole event horizon. The outline of this silhouette is the equator of the event horizon sphere. The dark silhouette of the black hole event horizon is placed within the expected position of the black hole shadow, which is not revealed on the first image. We calculated numerically the relation between the observed position of the black hole silhouette and the brightest point in the thin accretion disk, depending on the black hole spin. From this relation, we derive the spin of the supermassive black hole M87*, a = 0.75 ± 0.15 . View Full-Text
Keywords: general relativity; black holes; black hole shadow general relativity; black holes; black hole shadow
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Dokuchaev, V.I.; Nazarova, N.O. The Brightest Point in Accretion Disk and Black Hole Spin: Implication to the Image of Black Hole M87*. Universe 2019, 5, 183.

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