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Registering Gaia positions on VLBI images: constraining opacity-driven core shift in B 1038+528 / B 1038+529
Because of the complex and time-variable radio structure of active galactic nuclei (AGNs), absolute astrometric positions cannot generally be registered unambiguously with specific features in VLBI images. We aim to register Gaia optical centroids on VLBI images with about 0.1 mas accuracy and to lo
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