Astrometric Suitability of ICRF Sources Based on Intrinsic VLBI Structure
| hal.structure.identifier | Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB] | |
| hal.structure.identifier | Observatoire aquitain des sciences de l'univers [OASU] | |
| hal.structure.identifier | Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB] | |
| 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. | |
| 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 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.iso | en | |
| dc.source.title | International 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.en | Astrometric Suitability of ICRF Sources Based on Intrinsic VLBI Structure | |
| 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 | Proceedings edited by Dirk Behrend and Karen Baver, 2006, NASA/CP-2006-214140, p. 321 | |
| bordeaux.issue | 321-325 | |
| bordeaux.conference.title | International VLBI Service for Geodesy and Astrometry 2006 | |
| bordeaux.country | CL | |
| bordeaux.title.proceeding | International 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.city | Concepción | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00109303 | |
| hal.version | 1 | |
| hal.invited | non | |
| hal.proceedings | oui | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00109303v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.btitle=International%20VLBI%20Service%20for%20Geodesy%20and%20Astrometry%202006%20General%20Meeting%20Proceedings%7D,%20Concepci%C3%B3n,%20Chili,%209-11%20January%202006,%20Eds&rft.date=2006&rft.issue=321-325&rft.spage=Proceedings%20edited%20by%20Dirk%20Behrend%20and%20Karen%20Baver,%202006,%20NASA/CP-2006-214140,%20p.%20321&rft.epage=Proceedings%20edited%20by%20Dirk%20Behrend%20and%20Karen%20Baver,%202006,%20NASA/CP-2006-214140,%20p.%20321&rft.au=CHARLOT,%20P.&FEY,%20A.%20L.&OJHA,%20R.&BOBOLTZ,%20D.%20A.&rft.genre=unknown |
Files in this item
| Files | Size | Format | View |
|---|---|---|---|
|
There are no files associated with this item. |
|||