2024/12/02 by Yassine Ben Zineb, Feryal Özel, Zineb, Yassine Ben +3 · 1 citation
Physics and Astronomy · #Relativity and Gravitational Theory #Experimental and Theoretical Physics Studies #Adaptive optics and wavefront sensing
paper · pdf · doi:10.48550/arxiv.2412.01904
Horizon-scale imaging with the Event Horizon Telescope (EHT) has provided transformative insights into supermassive black holes but its resolution and scope are limited by ground-based constraints such as the size of the Earth, its relatively slow rotation, and atmospheric delays. Space-based very long baseline interferometry (VLBI) offers the capability for studying a larger and more diverse sample of black holes. We identify a number of nearby supermassive black holes as prime candidates for horizon-scale imaging at millimeter wavelengths, and use source characteristics such as angular size, sky distribution, and variability timescales to shape the design of a space-based array. We identify specific metrics that serve as key predictors of image fidelity and scientific potential, providing a quantitative basis for optimizing mission design parameters. Our analysis demonstrates that the optimal configuration requires two space-based elements in high Earth orbits (HEO) that are not coplanar and are apparently counter-rotating. Our results delineate the key requirements for a space-based VLBI mission, enabling detailed studies of black hole shadows, plasma dynamics, and jet formation, advancing black hole astrophysics beyond the current capabilities of the EHT.