171 citations · 592 across the 26 of their papers we have counts for
26 papers
New Global VLBI observations of the gravitational lensing system MG J0414+0534
F. Volino, O. Wucknitz, R. W. Porcas +9
The gravitational lens system MG J0414+0534 is formed by an elliptical galaxy at redshift ~0.96 and a quasar at z~2.64. The system geometry is typical of lensing by an elliptical g…
Revisited "Cluster-Cluster" VLBI with future multi-beam low frequency radio interferometers
M. J. Rioja, R. Dodson, R. W. Porcas +4
We revisit the "Cluster-Cluster" or multi-view Very-Long-Baseline-Interferometry (VLBI) technique from the perspective of its synergy with the multi-beam features inherent in the A…
Radio astrometry with chromatic AGN core positions
R. W. Porcas
Aims: The effect of frequency-dependent AGN core positions (``core-shifts'') on radio Very Long Baseline Interferometry (VLBI) global astrometry measurements is investigated. Metho…
Double radio peak and non-thermal collimated ejecta in RS Ophiuchi following the 2006 outburst
S. P. S. Eyres, T. J. O'Brien, R. Beswick +12
We report MERLIN, VLA, OCRA-p, VLBA, Effelsberg and GMRT observations beginning 4.5 days after the discovery of RS Ophiuchi undergoing its 2006 recurrent nova outburst. Observation…
The role of luminous substructure in the gravitational lens system MG 2016+112
A. More, J. P. McKean, S. More +3
MG 2016+112 is a quadruply imaged lens system with two complete images A and B and a pair of merging partial images in region C as seen in the radio. The merging images are found t…
Multi-step VLBI observations of weak extragalactic radio sources to align the ICRF and the future GAIA frame
G. Bourda, P. Charlot, R. Porcas +1
The space astrometry mission GAIA will construct a dense optical QSO-based celestial reference frame. For consistency between optical and radio positions, it will be important to a…