76 citations · 115 across the 21 of their papers we have counts for
5 papers · 2 filters
VLBI imaging of the gravitational lenses B1422+231 and MGJ0414+0534
E. Ros, J. C. Guirado, J. M. Marcaide +5
We present wide-field images of the quadruple gravitational lenses B1422+231 and MGJ0414+0534 obtained from global Very Long Baseline Interferometry (VLBI) observations at 8.4 GHz…
On the way to global phase-delay astrometry
E. Ros, J. M. Marcaide, J. C. Guirado +1
The use of the phase-delay improves substantially the accuracy obtained in VLBI astrometry with respect to the group-delay observable. Recently, Ros et al. (1999) have extended the…
The complete S5 polar cap sample: en route to phase-delay global astrometry
E. Ros, J. M. Marcaide, J. C. Guirado +1
We report on the present status of our S5 polar cap phase-connected astrometry program. We observe 13 radio sources in the northernmost 20deg of the sky at the wavelengths of 3.6cm…
VLBI difference astrometry at 43GHz
J. C. Guirado, J. M. Marcaide, M. A. Perez-Torres +1
From 43GHz VLBA observations of the pair of radio sources 1928+738 and 2007+777 we have demonstrated the feasibility of precision phase-delay differential astrometric techniques at…
A GPS-based method to model the plasma effects in VLBI observations
E. Ros, J. M. Marcaide, J. C. Guirado +2
Global Positioning System (GPS) satellites broadcast at frequencies of 1,575.42 MHz (L1) and of 1,227.60 MHz (L2). The dispersive property of the ionosphere can be used to combine…