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VLBI observations of weak extragalactic radio sources for the alignment of the future Gaia frame with the ICRF

hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
hal.structure.identifierUniversité Sciences et Technologies - Bordeaux 1 [UB]
dc.contributor.authorBOURDA, G.
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
hal.structure.identifierUniversité Sciences et Technologies - Bordeaux 1 [UB]
dc.contributor.authorCHARLOT, P.
hal.structure.identifierMPIfR
dc.contributor.authorPORCAS, R.
hal.structure.identifierJodrell Bank Observatory
dc.contributor.authorGARRINGTON, S.
dc.contributor.editorW.-J. Jin
dc.contributor.editorI. Platais
dc.contributor.editorM. Perryman
dc.date.issued2008
dc.date.conference2008
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. This 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 IAU Symposium 2008 - 2008IAUS..248..324B
dc.subject.enastrometry
dc.subject.enreference systems
dc.subject.enquasars
dc.title.enVLBI observations of weak extragalactic radio sources for the alignment of the future Gaia frame with the ICRF
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.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.identifier.arxiv0711.3455
bordeaux.pagep. 324-325
bordeaux.volume248
bordeaux.countryCN
bordeaux.title.proceedingProceedings IAU Symposium 2008 - 2008IAUS..248..324B
bordeaux.conference.cityShangai
bordeaux.peerReviewedoui
hal.identifierhal-00189628
hal.version1
hal.invitednon
hal.proceedingsoui
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00189628v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.btitle=Proceedings%20IAU%20Symposium%202008%20-%202008IAUS..248..324B&rft.date=2008&rft.volume=248&rft.spage=p.%20324-325&rft.epage=p.%20324-325&rft.au=BOURDA,%20G.&CHARLOT,%20P.&PORCAS,%20R.&GARRINGTON,%20S.&rft.genre=unknown


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