TL;DR
This paper explores how an advanced space-VLBI system, including a space antenna, can enhance the Event Horizon Telescope's ability to image and differentiate spacetime structures around Sgr A* by using simulations and optimized observational strategies.
Contribution
It introduces a novel approach combining GRMHD simulations, synthetic data, and optimization of a space antenna's orbit to improve black hole imaging and spacetime discrimination capabilities.
Findings
Inclusion of a space antenna enhances black hole spin differentiation.
Synthetic observations show improved imaging with the space antenna.
Optimized orbits increase u-v coverage and image quality.
Abstract
The Event Horizon Telescope (EHT) will soon provide the first high-resolution images of the Galactic Centre supermassive black hole (SMBH) candidate Sagittarius A* (Sgr A*), enabling us to probe gravity in the strong-field regime. Besides studying the accretion process in extreme environments, the obtained data and reconstructed images could be used to investigate the underlying spacetime structure. In its current configuration, the EHT is able to distinguish between a rotating Kerr black hole and a horizon-less object like a boson star. Future developments can increase the ability of the EHT to tell different spacetimes apart. We investigate the capability of an advanced EHT concept, including an orbiting space antenna, to image and distinguish different spacetimes around Sgr A*. We use GRMHD simulations of accreting compact objects (Kerr and dilaton black holes, as well as boson…
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