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Astrometric Suitability of ICRF Sources Based on Intrinsic VLBI Structure

hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorCHARLOT, P.
hal.structure.identifierUS Naval Observatory [US NAVAL OBSERVATORY]
dc.contributor.authorFEY, A. L.
hal.structure.identifierUS Naval Observatory [US NAVAL OBSERVATORY]
dc.contributor.authorOJHA, R.
hal.structure.identifierUS Naval Observatory [US NAVAL OBSERVATORY]
dc.contributor.authorBOBOLTZ, D. A.
dc.date.issued2006
dc.date.conference2006
dc.description.abstractEnThe intrinsic radio structure of the extragalactic sources is one of the limiting errors in the analysis of astrometric and geodetic VLBI observations. Based on VLBI images obtained with the VLBA and other VLBI telescopes around the world, we evaluate this effect for 557 sources (78% of the ICRF) and calculate a so-called ``structure index" to define the astrometric source quality. The structure index ranges from 1 for the most compact sources to 4 for the most extended sources. The most recent addition to our data base is for a hundred southern hemisphere sources. We discuss the overall distribution of structure index in the ICRF and the structure index variability with time for those sources that have VLBI images available at multiple epochs. Based on these data, we identify a set of 239 sources that have good or excellent astrometric suitability. We also suggest that the structure index indicator be used as a primary criterion to select defining sources for the next ICRF realization.
dc.language.isoen
dc.source.titleInternational VLBI Service for Geodesy and Astrometry 2006 General Meeting Proceedings}, Concepción, Chili, 9-11 January 2006, Eds. D. Behrend and K. D. Baver, NASA/CP-2006-214140,
dc.title.enAstrometric Suitability of ICRF Sources Based on Intrinsic VLBI Structure
dc.typeCommunication dans un congrès
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]
bordeaux.pageProceedings edited by Dirk Behrend and Karen Baver, 2006, NASA/CP-2006-214140, p. 321
bordeaux.issue321-325
bordeaux.countryCL
bordeaux.title.proceedingInternational VLBI Service for Geodesy and Astrometry 2006 General Meeting Proceedings}, Concepción, Chili, 9-11 January 2006, Eds. D. Behrend and K. D. Baver, NASA/CP-2006-214140,
bordeaux.conference.cityConcepción
bordeaux.peerReviewedoui
hal.identifierhal-00109303
hal.version1
hal.invitednon
hal.proceedingsoui
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00109303v1
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