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Radio source structures in VLBI astrometry

Published online by Cambridge University Press:  03 August 2017

Patrick Charlot,
Jean-François Lestrade and
Claude Boucher
Patrick Charlot
Affiliation:
Institut Géographique National, 2 Avenue Pasteur, F-94160, Saint-Mandé, France
Jean-François Lestrade
Affiliation:
Bureau des Longitudes, 77 Avenue Denfert-Rochereau, F-75014, Paris, France
Claude Boucher
Affiliation:
Institut Géographique National, 2 Avenue Pasteur, F-94160, Saint-Mandé, France

Abstract

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In astrometry, celestial radio sources with extended structures are useful. An algorithm to correct for structure in VLBI delays and delay rates is developed. The radio source NRAO140 is mapped from data with limited u-v coverage by the hybrid method and the Maximum Entropy procedure. The magnitude of the structure corrections in astrometry is discussed in the case of NRAO140.

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