Absolute kinematics of radio source components in the complete S5 polar cap sample: III. First wide-field high-precision astrometry at 15.4GHz
Journal article, 2008

We report on the first wide-field, high-precision astrometric analysis of the 13 extragalactic radio sources of the complete S5 polar cap sample at 15.4 GHz. We describe new algorithms developed to enable the use of differenced phase delays in wide-field astrometric observations and discuss the impact of using differenced phase delays on the precision of the wide-field astrometric analysis. From this global fit, we obtained estimates of the relative source positions with precisions ranging from 14 to 200 as at 15.4 GHz, depending on the angular separation of the sources (from ∼1.6 to ∼20.8 degrees). These precisions are ∼10 times higher than the achievable precisions using the phase-reference mapping technique. © 2008 ESO.

Radio continuum: general

Galaxies: quasars: general

Galaxies: BL Lacertae objects: general


Techniques: interferometric


Ivan Marti-Vidal

Universitat de Valencia

Radio Astronomy and Astrophysics

J. M. Marcaide

Universitat de Valencia

J. C. Guirado

Universitat de Valencia

M.A. Pérez-Torres

Institute of Astrophysics of Andalusia (IAA)

Eduardo Ros

Max-Planck Institute for Radio Astronomy

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 478 1 267-275

Subject Categories

Astronomy, Astrophysics and Cosmology


Onsala Space Observatory



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