Aligning VLBI and Gaia Extragalactic Celestial Reference Frames: source selection scenario

G. Bourda 1 P. Charlot 1 A. Collioud 1
1 M2A 2015
LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac]
Abstract : The European space astrometry mission Gaia will construct a dense optical celestial reference frame based on Quasi Stellar Objects. Accordingly, by 2020, two extragalactic celestial reference frames will coexist: the VLBI frame (Very Long Baseline Interferometry) in the radio domain, currently adopted by the IAU as the fundamental one, and the Gaia frame determined from direct optical observations of quasars by the satellite.For consistency between optical and radio positions of any celestial targets, it will be fundamental to align the Gaia and VLBI frames with the highest accuracy. This issue is also important in the framework of astrophysics, for example to probe properly the jets properties and the physics of the Active Galactic Nuclei.In this paper, based on the ICRF2 catalogue (International Celestial Reference Frame) and specific dedicated VLBI projects (e.g. designed to observe additional weaker extragalactic radio sources), we will discuss the selection of the VLBI-Gaia transfer sources, present our initiatives to reach this alignment, review the status of the various projects in question and draw plans for the future.
Type de document :
Communication dans un congrès
2015IAUGA.2252277B - IAU General Assembly, Meeting #29, #2252277 - held 4-8 January 2015 in Seattle, USA, Jan 2015, Seattle, United States. 22, pp.52277, 2015
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https://hal.archives-ouvertes.fr/hal-01197387
Contributeur : Marie-Paule Pomies <>
Soumis le : vendredi 11 septembre 2015 - 15:50:21
Dernière modification le : samedi 12 septembre 2015 - 01:03:49

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G. Bourda, P. Charlot, A. Collioud. Aligning VLBI and Gaia Extragalactic Celestial Reference Frames: source selection scenario. 2015IAUGA.2252277B - IAU General Assembly, Meeting #29, #2252277 - held 4-8 January 2015 in Seattle, USA, Jan 2015, Seattle, United States. 22, pp.52277, 2015. <hal-01197387>

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