Multi-wavelength differential astrometry of the S5 polar cap sample

Details Multi-wavelength differential astrometry of the S5 polar cap sample Multi-wavelength differential astrometry of the S5 polar cap sample

2004-12-17

arxiv.org/abs/astro-ph/0412471v1

Astronomy and Astrophysics

Astrophysics

2 pages. 1 figure. Proceedings of the 7th European VLBI Network Symposium held in Toledo, Spain on October 12-15, 2004. Editor

Scientific paper

We report on the status of our S5 polar cap astrometry program. Since 1997 we have observed all the 13 radio sources of the complete S5 polar cap sample at the wavelengths of 3.6 cm, 2 cm and 7 mm. Images of the radio sources at 3.6 and 2 cm have already been published reporting morphological changes. Preliminary astrometric analyses have been carried out at three frequencies with precisions in the relative position determination ranging from 80 to 20 microarcseconds. We report also on the combination of our phase-delay global astrometry results with the microarcsecond-precise optical astrometry that will be provided by future space-based instruments.

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