Event horizon silhouette: implications to supermassive black holes M87* and SgrA*

Abstract

We demonstrate that a dark silhouette of the black hole illuminated by a thin accretion disk and seen by a distant observer is, in fact, a silhouette of the event horizon hemisphere. The boundary of this silhouette is a contour of the event horizon equatorial circle if a thin accretion disk is placed in the black hole equatorial plane. A luminous matter plunging into black hole from different directions provides the observational opportunity for recovering a total silhouette of the invisible event horizon globe. The event horizon silhouette is projected on the celestial sphere within a position of the black hole shadow. A relative position of brightest point in the accretion disk with respect to the position of event horizon silhouette in the image of black hole in the galaxy M87, observed by the Event Horizon Telescope, corresponds to a rather high value of the black hole spin, $a\simeq 0.75$.

arXiv comment17 pages, 12 figures, references added, accepted to Gen. Rel. Gravit

References in corpus (26)

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Cited by in corpus (15)

• Shadow, lensing, quasinormal modes, greybody bounds and neutrino propagation by dyonic ModMax black holes
• Black hole shadow as a standard ruler in cosmology
• First analytical calculation of black hole shadow in McVittie metric
• Observational signature of a near-extremal Kerr-Sen black hole in the heterotic string theory
• Silhouettes of invisible black holes
• The brightest point in accretion disk and black hole spin: implication to the image of black hole M87*
• Spin oscillations of neutrinos scattered off a rotating black hole
• Modeling the motion of a bright spot in jets from black holes M87* and SgrA*
• Testing the Black Hole No-hair Theorem with Galactic Center Stellar Orbits
• Spins of supermassive black holes M87* and SgrA* revealed from the size of dark spots in Event Horizon Telescope Images
• Black Hole Shadow Observations with Space-Ground Interferometers
• Physical origin of the dark spot at the image of supermassive black hole SgrA* revealed by the EHT collaboration
• Visible shapes of black holes M87* and SgrA*
• Images of black holes viewed by distant observer
• Generalized Einstein-Rosen bridge inside black holes