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Radio galaxies, a subset of Active Galactic Nuclei (AGNs), may be single compact structures, simple doubles, or large, multicomponent structures with complex morphologies. Identifying which discrete radio components belong to a single source, and which optical or infrared galaxy is their host, can thus be a complex task.
Interferometric closure invariants, constructed from triangular loops of mixed Fourier components, capture calibration-independent information on source morphology. While a complete set of closure invariants is directly obtainable from measured visibilities, the inverse transformation from closure invariants to the source intensity distribution is not established.
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