VLBI

Comparison of dynamical and kinematic reference frames via pulsar positions from timing, Gaia, and interferometric astrometry
Using pulsar positions measured independently by timing, VLBI, and Gaia, this paper assesses the orientation consistency between …
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Comparison of dynamical and kinematic reference frames via pulsar positions from timing, Gaia, and interferometric astrometry
Evaluation of the ICRF stability from a position time series analysis
VLBI-based evaluation of ICRF3 stability shows that the axes are stable at the 10–20 μas level over 1979–2020.
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Evaluation of the ICRF stability from a position time series analysis
Comparison of multifrequency position measurements of compact extragalactic radio sources in the framework of the ICRF3
VLBI analysis of multifrequency source positions shows measurable frequency-dependent core shifts in compact extragalactic radio sources.
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Comparison of multifrequency position measurements of compact extragalactic radio sources in the framework of the ICRF3
Parsec-scale alignments of radio–optical offsets with jets in AGNs from multifrequency geodetic VLBI, Gaia EDR3, and the MOJAVE program
Alignment of multiwavelength VLBI–Gaia positions with parsec-scale jets; optical centroids are downstream and polarized, consistent with a core–jet scenario.
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Parsec-scale alignments of radio–optical offsets with jets in AGNs from multifrequency geodetic VLBI, Gaia EDR3, and the MOJAVE program
Systematics and accuracy of VLBI astrometry: A comparison with Gaia Data Release 2
ICRF3 vs Gaia DR2: S/X agrees at ~30 μas globally; K and X/Ka show zonal systematics, notably a >200 μas Z-glide in X/Ka.
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Systematics and accuracy of VLBI astrometry: A comparison with Gaia Data Release 2