Of 21 megamaser-disk AGN, only NGC 4258 is resolvable on Earth-L2 baselines, and its spin-offset measurement is limited by 22 GHz maser astrometry, not by shadow centroid precision.
Extremely long baseline interferometry with Origins Space Telescope
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abstract
Operating 1.5 million km from Earth at the Sun-Earth L2 Lagrange point, the Origins Space Telescope equipped with a slightly modified version of its HERO heterodyne instrument could function as a uniquely valuable node in a VLBI network. The unprecedented angular resolution resulting from the combination of Origins with existing ground-based millimeter/submillimeter telescope arrays would increase the number of spatially resolvable black holes by a factor of a million, permit the study of these black holes across all of cosmic history, and enable new tests of general relativity by unveiling the photon ring substructure in the nearest black holes.
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When the Shadow Meets Its Measure: Assessing the Feasibility of Submillimeter Black Hole Shadow Imaging in Megamaser Disk AGN
Of 21 megamaser-disk AGN, only NGC 4258 is resolvable on Earth-L2 baselines, and its spin-offset measurement is limited by 22 GHz maser astrometry, not by shadow centroid precision.