Very Long Baseline Interferometry (VLBI), using both SKA-Low and SKA-Mid, is poised to deliver groundbreaking observations with milliarcsecond resolution, surpassing the capabilities of the standard SKA array. VLBI in conjunction with the SKA holds the promise of unlocking profound insights across various astrophysical topics and science working groups.
VLBI with the SKA stands to revolutionise our understanding of galaxy evolution and the physics of jet accretion by studying Active Galactic Nuclei (AGN) at low luminosities. Moreover, it is poised to make significant contributions to cosmology, through constraining dark energy and dark matter via gravitational lenses and the study of nuclear water masers. The exploration of the stellar lifecycle, including the temporal evolution of supernova remnants, plus the rapid follow-up of transients (e.g., localising FRBs and tidal disruption events) adds another dimension to the diverse range of science that can be investigated by VLBI with the SKA.
SKA-VLBI is set to offer unparalleled astrometric observations capable of measuring proper motions and parallaxes of galactic objects. This capability opens the door to mapping the structure of our Galaxy and testing gravity within binary systems. This overview highlights just a subset of the topics that will be addressed in this presentation, where I will delve into the scientific achievements achievable through VLBI with the SKA and elucidate the operational aspects of SKA-VLBI.