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A VLBI survey of weak extragalactic radio sources for the alignment of the ICRF and the future Gaia frame

hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
dc.contributor.authorBOURDA, G.
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
dc.contributor.authorCHARLOT, P.
hal.structure.identifierMPIfR
dc.contributor.authorPORCAS, R.
hal.structure.identifierJodrell Bank Observatory
dc.contributor.authorGARRINGTON, S.
dc.contributor.editorN. Capitaine, Paris: Observatoire de Paris
dc.date.issued2008
dc.date.conference2007-09-17
dc.description.abstractEnThe space astrometry mission Gaia will construct a dense optical QSO-based celestial reference frame. For consistency between the optical and radio positions, it will be important to align the Gaia frame and the International Celestial Reference Frame (ICRF) with the highest accuracy. Currently, it is found that only 10% of the ICRF sources are suitable to establish this link, either because they are not bright enough at optical wavelengths or because they have significant extended radio emission which precludes reaching the highest astrometric accuracy. In order to improve the situation, we have initiated a VLBI survey dedicated to finding additional high-quality radio sources for aligning the two frames. The sample consists of about 450 sources, typically 20 times weaker than the current ICRF sources, which have been selected by cross-correlating optical and radio catalogues. The paper presents the observing strategy and includes preliminary results of observation of 224 of these sources with the European VLBI Network in June 2007.
dc.language.isoen
dc.source.titleProceedings of the "Journées Systèmes de Référence Spatio-temporels 2007 - 2008jsrs.meet...36B
dc.title.enA VLBI survey of weak extragalactic radio sources for the alignment of the ICRF and the future Gaia frame
dc.typeCommunication dans un congrès
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.identifier.arxiv0803.1395
bordeaux.page36
bordeaux.countryFR
bordeaux.title.proceedingProceedings of the "Journées Systèmes de Référence Spatio-temporels 2007 - 2008jsrs.meet...36B
bordeaux.conference.cityParis
bordeaux.peerReviewedoui
hal.identifierhal-00261888
hal.version1
hal.invitednon
hal.proceedingsoui
hal.conference.end2007-09-19
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00261888v1
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