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Selecting Highly-Compact Radio Sources for the Definition of the Celestial Reference Frame

hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
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.
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
dc.contributor.authorCAMARGO, J. I. B.
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
dc.contributor.authorCOLLIOUD, 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 definition of the celestial reference frame. Based on multi-epoch VLBI images obtained with the VLBA and other VLBI telescopes around the world between 1994 and 2005, we evaluate this effect for 557 ICRF sources (about 80% of the current frame) and calculate a so-called "structure index" to define the astrometric suitability of the sources. The structure index ranges from 1 for the most compact sources to 4 for the most extended sources. The number of epochs for which the structure index is available for a given source varies from 1 for the least-observed sources to 20 for the intensively-observed sources. From this calculation, we identify a subset of 242 ICRF sources which have very good or good astrometric suitability (i.e a structure index of either 1 or 2) at any of the available epochs. We argue that these compact sources are potential candidates for defining the celestial frame with the highest accuracy when a future realization of the ICRF is made.
dc.language.isoen
dc.source.titleNomenclature, Precession and New Models in Fundamental Astronomy, 26th meeting of the IAU, Joint Discussion 16, 22-23 August 2006, Prague, Czech Republic, JD16, #4 - 2006IAUJD..16E...4C
dc.title.enSelecting Highly-Compact Radio Sources for the Definition of the Celestial Reference Frame
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.page-
bordeaux.countryCZ
bordeaux.title.proceedingNomenclature, Precession and New Models in Fundamental Astronomy, 26th meeting of the IAU, Joint Discussion 16, 22-23 August 2006, Prague, Czech Republic, JD16, #4 - 2006IAUJD..16E...4C
bordeaux.peerReviewedoui
hal.identifierhal-00401846
hal.version1
hal.invitednon
hal.proceedingsnon
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00401846v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.btitle=Nomenclature,%20Precession%20and%20New%20Models%20in%20Fundamental%20Astronomy,%2026th%20meeting%20of%20the%20IAU,%20Joint%20Discussion%2016,%2022-23%20August%202006,%20&rft.date=2006&rft.spage=-&rft.epage=-&rft.au=CHARLOT,%20P.&FEY,%20A.%20L.&OJHA,%20R.&BOBOLTZ,%20D.%20A.&CAMARGO,%20J.%20I.%20B.&rft.genre=unknown


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