| hal.structure.identifier | Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB] | |
| hal.structure.identifier | Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB] | |
| hal.structure.identifier | Observatoire aquitain des sciences de l'univers [OASU] | |
| dc.contributor.author | CHARLOT, P. | |
| hal.structure.identifier | U.S. Naval Observatory | |
| dc.contributor.author | FEY, A. L. | |
| hal.structure.identifier | U.S. Naval Observatory | |
| dc.contributor.author | OJHA, R. | |
| hal.structure.identifier | U.S. Naval Observatory | |
| dc.contributor.author | BOBOLTZ, D. A. | |
| hal.structure.identifier | Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB] | |
| hal.structure.identifier | Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB] | |
| hal.structure.identifier | Observatoire aquitain des sciences de l'univers [OASU] | |
| dc.contributor.author | CAMARGO, J. I. B. | |
| hal.structure.identifier | Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB] | |
| hal.structure.identifier | Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB] | |
| hal.structure.identifier | Observatoire aquitain des sciences de l'univers [OASU] | |
| dc.contributor.author | COLLIOUD, A. | |
| dc.date.issued | 2006 | |
| dc.date.conference | 2006 | |
| dc.description.abstractEn | The 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.iso | en | |
| dc.source.title | Nomenclature, 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.en | Selecting Highly-Compact Radio Sources for the Definition of the Celestial Reference Frame | |
| dc.type | Communication dans un congrès | |
| dc.subject.hal | Physique [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO] | |
| dc.subject.hal | Planète et Univers [physics]/Astrophysique [astro-ph] | |
| bordeaux.page | - | |
| bordeaux.conference.title | 2006IAUJD..16E...4C - Nomenclature, Precession and New Models in Fundamental Astronomy, 26th meeting of the IAU, Joint Discussion 16, 22-23 August 2006, Prague, Czech Republic, JD16, #4 | |
| bordeaux.country | CZ | |
| bordeaux.title.proceeding | Nomenclature, 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.peerReviewed | oui | |
| hal.identifier | hal-00401846 | |
| hal.version | 1 | |
| hal.invited | non | |
| hal.proceedings | non | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00401846v1 | |
| bordeaux.COinS | ctx_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 | |
