Event-Horizon-Telescope Evidence for Alignment of the Black Hole in the Center of the Milky Way with the Inner Stellar Disk

Abstract

Observations of the black hole in the center of the Milky Way with the Event Horizon Telescope at 1.3 mm have revealed a size of the emitting region that is smaller than the size of the black-hole shadow. This can be reconciled with the spectral properties of the source, if the accretion flow is seen at a relatively high inclination (50-60 degrees). Such an inclination makes the angular momentum of the flow, and perhaps of the black hole, nearly aligned with the angular momenta of the orbits of stars that lie within 3 arcsec from the black hole. We discuss the implications of such an alignment for the properties of the black hole and of its accretion flow. We argue that future Event-Horizon-Telescope observations will not only refine the inclination of Sgr A* but also measure precisely its orientation on the plane of the sky.

To appear in the Astrophysical Journal

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Cited by in corpus (9)

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• Silhouettes of invisible black holes
• Visibility of Black Hole Shadows in Low-luminosity AGN
• Brightness Asymmetry of Black Hole Images as a Probe of Observer Inclination
• Black Hole Shadow with Soft Hair
• Prospects for probing small-scale dark matter models with pulsars around Sagittarius A*
• The Core-shift of Sagittarius A* as a Discriminant between Disk and Jet Emission Models with millimeter-VLBI
• Visible shapes of black holes M87* and SgrA*