ANDREI, A. H.; ASSAFIN, M.; BARACHE, C.; BOUQUILLON, S.; BOURDA, G.; CAMARGO, J. I. B.; LE CAMPION, J.-F.; CHARLOT, P.; GONTIER, A.-M.; LAMBERT, S.; OSÓRIO, J. J. Pereira; DA SILVA NETO, D. N.; SOUCHAY, J.; MARTINS, R. Vieira

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ANDREI, A. H.
Systèmes de Référence Temps Espace [SYRTE]

ASSAFIN, M.

BARACHE, C.
Systèmes de Référence Temps Espace [SYRTE]

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Communication dans un congrès

Ce document a été publié dans

Proceedings of the "Journées Systèmes de Référence Spatio-temporels 2007" -2008jsrs.meet...32A, Proceedings of the "Journées Systèmes de Référence Spatio-temporels 2007" -2008jsrs.meet...32A, « The Celestial Reference Frame for the future", Proc. Journées Systèmes de Référence Spatio-Temporels 2007: " ed. N. Capitaine, Meudon – France, 17-19 Septembre 2007, 2007, Meudon. 2008p. 32

Résumé en anglais

Gaia photometric capabilities should distinguish quasars to a high degree of certainty. With this, they should also be able to deliver a clean sample of quasars with a negligible trace of stellar contaminants. However, a purely photometric sample could miss a non negligible percentage of ICRF sources counterparts - and this interface is required to align with the ICRS and de-rotate the GCRF (Gaia Celestial Reference Frame), on grounds of continuity. To prepare a minimum clean sample forming the initial quasar catalogue for the Gaia mission, an all sky ensemble was formed containing 128,257 candidates. Among them there is at least one redshift determination for 98.75%, and at least one magnitude determination for 99.20% of the targets. The sources were collected from different optical and radio lists. We analyze the redshift, magnitude, and color distributions, their relationships, as well as their degree of completeness. Complementary, the candidate sources enable to form an optical representation of the ICRS from first principles, namely, kinematically non-rotating with respect to the ensemble of distant extragalactic objects, aligned to the mean equator and dynamical equinox of J2000, and realized by a list of adopted coordinates of extragalactic sources.< Réduire

Mots clés en anglais

astronomical data bases: miscellaneous

astrometry

reference systems

quasars: general

Origine

Importé de hal

Unités de recherche

Laboratoire d'Astrophysique de Bordeaux (LAB) - UMR 5804