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Astron. Astrophys. 318, L32-L34 (1997)

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Letter to the Editor

Baseline errors in European VLBI Network measurements III. The dominant effect of instrumental polarization.

M. Massi 1, 2, 3, M. Rioja 1, D. Gabuzda 4, K. Leppänen 1, H. Sanghera 1, K. Ruf 3 and L. Moscadelli 1, 3

1 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
2 Joint Institute for VLBI in Europe. Postbus 2, 7990 AA, Dwingeloo, The Netherlands
3 Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy
4 Lebedev Physical Institute, Leninsky Prospect 53, 117924 Moscow, Russia

Received 10 September 1996 / Accepted 14 November 1996

Abstract

In this paper, we compare the results of a VLBI observation involving 7 European telescopes with the model by Massi et al. 1996 for the contribution of the instrumental polarization to the closure phase. The excellent agreement found between model predictions and data proves that the systematic error present in European VLBI data is in fact due to the high instrumental polarization of some of the telescopes and can be removed by data processing.

Key words: Methods: analytical- Methods: data analysis- Techniques: interferometric - Instrumentation: interferometers

Send offprint requests to: M. Massi

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© European Southern Observatory (ESO) 1997

Online publication: July 8, 1998
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