Correlation between source structure evolution and VLBI position instabilities

R. Bouffet 1 P. Charlot 1 S. Lambert 2
1 M2A 2013
L3AB - Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux, OASU - Observatoire aquitain des sciences de l'univers, LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac], Université Sciences et Technologies - Bordeaux 1
Abstract : Astrometric positions of extragalactic radio sources derived from VLBI data are used to build highly-accurate reference frames such as the International Celestial Reference Frame. Despite their distant locations, instabilities in the position of these sources are often seen on time scales of months to years, which is generally thought to be caused by source structure evolution. In this paper, we compare position instabilities and structural evolution for a sample of 68 sources observed over a 10-year period (1994--2003). Our results indicate that the two phenomena are linked at some level although the correlation is not perfect.
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Contributeur : Marie-Paule Pomies <>
Soumis le : jeudi 12 juin 2014 - 11:29:20
Dernière modification le : lundi 13 octobre 2014 - 15:43:25




R. Bouffet, P. Charlot, S. Lambert. Correlation between source structure evolution and VLBI position instabilities. -, 2013, Espoo, Finland. pp.185-188, 2013. <hal-01005229>



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