Source structure and VLBI position instabilities

Romuald Bouffet 1 P. Charlot 1 Sébastien Lambert 2
1 M2A 2012
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
2 SYRTE - Systèmes de Référence Temps Espace
Abstract : Most of the extragalactic radio sources that materialize the International Celestial Reference Frame (ICRF) exhibit spatially - extended structures on milliarcsecond scales which limit the accuracy of the source positions estimated from Very Long Baseline Interferometry (VLBI) data. These structures when varying with time may also lead to instabilities in the source positions. Structural variations are generally due to ejection of material from the VLBI core in a recurrent although unpredictable manner. Based on the available VLBI astrometric data and source images, we compare position instabilities and structural variations and conclude about the level of correlation between the two phenomena.
Type de document :
Communication dans un congrès
IAU Joint Discussion 7: Space-Time Reference Systems for Future Research at IAU General Assembly-Beijing. 27-29 August 2012 in Beijing, China Online at http://referencesystems.info/iau-joint-discussion-7.html, id.P15, 2012, beijing, China
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https://hal.archives-ouvertes.fr/hal-00838698
Contributeur : Marie-Paule Pomies <>
Soumis le : mercredi 26 juin 2013 - 12:19:42
Dernière modification le : mardi 29 mai 2018 - 12:51:07

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L3AB | INSU | OBSPM | UPMC | SYRTE | PSL

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Romuald Bouffet, P. Charlot, Sébastien Lambert. Source structure and VLBI position instabilities. IAU Joint Discussion 7: Space-Time Reference Systems for Future Research at IAU General Assembly-Beijing. 27-29 August 2012 in Beijing, China Online at http://referencesystems.info/iau-joint-discussion-7.html, id.P15, 2012, beijing, China. 〈hal-00838698〉

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