A method to measure ring diameter, width, and asymmetry from the zeros of the interferometric visibility function is derived and tested on M87*, yielding r≈23 μas and B=0.48.
On Optimal Geometry for Space Interferometers
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This paper examines options for orbit configurations for a space interferometer. In contrast to previously presented concepts for space very long baseline interferometry, we propose a combination of regular and retrograde near-Earth circular orbits in order to achieve a faster filling of $(u,v)$ coverage. With the rapid relative motion of the telescopes, it will be possible to quickly obtain high quality images of supermassive black holes. As a result of such an approach, it will be possible for the first time to conduct high quality studies of the supermassive black hole close surroundings in dynamics.
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Method for Determining the Parameters of a Ring-like Structure from the Visibility Function Shape
A method to measure ring diameter, width, and asymmetry from the zeros of the interferometric visibility function is derived and tested on M87*, yielding r≈23 μas and B=0.48.