Milky Way中心黑洞与内星盘对准的事件视界望远镜证据
Event-Horizon-Telescope Evidence for Alignment of the Black Hole in the Center of the Milky Way with the Inner Stellar Disk
摘要：
用1.3毫米的事件视界望远镜对银河系中心的黑洞进行观测，发现发射区的大小小于黑洞阴影的大小。如果吸积流是在一个相对较高的倾角（50-60度）上观测到的，这可以与源的光谱特性相一致。这样的倾斜使得气流的角动量，也许还有黑洞的角动量，几乎与距离黑洞3角秒以内的恒星轨道的角动量一致。我们讨论了这样一个对齐的黑洞的性质和吸积流的影响。我们认为，未来的事件视界-望远镜观测不仅会改善Sgr A* 的倾角，而且还能精确测量它在天空平面上的方位。
英文摘要：
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.
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