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Scientific Highlights with the SMA

Persistent Asymmetric Structure of Sagittarius A* on Event Horizon Scales

Constraints on a two point-source model for Sgr A* based on closure phase measurements. Offsets between two point sources that would produce closure phases between +0°9 and +14°9 at all triangles of (u,v) coordinates sampled by our data. For a unit point source centered at the origin, the colored regions indicate the allowed offset of a second point source, with color indicating the maximum value of the flux ratio between the two components. The circle shows an offset of 50 μas, which is approximately the diameter of the predicted shadow in Sgr A*. For two components separated by the shadow diameter, a roughly east-west alignment with the brighter component to the west is required to be consistent with our data.

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