The very long baseline interferometry technique allows us to determine the positions of
thousands of radio sources using the absolute astrometry approach. I have investigated the …

An ideal target for geodetic very long baseline interferometry (VLBI) is a strong and point-like
radio source. In reality, most celestial sources used in geodetic VLBI have spatial structure …

The AUSTRAL observing program was started in 2011, performing geodetic and astrometric
very long baseline interferometry (VLBI) sessions using the new Australian AuScope VLBI …

We present an all-sky catalog of absolute positions and estimates of correlated flux density
of 21,942 compact radio sources determined from processing interferometric visibility data of …

The CONT14 campaign with state-of-the-art very long baseline interferometry (VLBI) data
has observed the source 0642+ 449 with about 1000 observables each day during a …

The Blandford and Königl model of active galactic nuclei (AGN) jets predicts that the position
of the apparent opaque jet base–the core–changes with frequency. This effect is observed …

Closure quantities measured by very-long-baseline interferometry (VLBI) observations are
independent of instrumental and propagation instabilities and antenna gain factors, but are …

Active Galactic Nuclei (AGNs) observed with the technique of very long baseline
interferometry (VLBI) are used as fiducial references on the sky to precisely measure the …

Context. The celestial reference frame is established on the basis of the absolute positions
of extragalactic sources that are assumed to be fixed in space. The fixing of the axes is one …

Very Long Baseline Interferometry (VLBI) is critical for the realisation of global geodetic
reference frames. The new VLBI system (VLBI Geodetic Observing System; VGOS) is …