EAS Publications Series
Volume 2, 2002GAIA: A European Space Project
|Page(s)||327 - 339|
|Section||Section VI: Outside our Galaxy|
|Published online||25 September 2002|
O. Bienaymé and C. Turon (eds)
EAS Publications Series, 2 (2002) 327-339
Observations of QSOs and Reference Frame with GAIA
OCA/CERGA, avenue Copernic, 06130 Grasse, France
The astrometric mission GAIA will provide a flux limited census of quasi stellar objects to V=20 mag. This paper addresses the main physical and observational properties of the quasars, the existing surveys and the relevant statistical distributions of the compilation catalogue of Véron-Cetty & Véron. Then I consider the detection and recognition with GAIA which should be based on the multicolour photometry complemented by hints on the parallaxes and proper motions. In the last section I discuss the possibility to materialize directly in the optical the quasi-inertial frame to the sub-μas accuracy. It is shown that that with a clean sample of less than 10 000 quasars the residual spin of the GAIA reference frame can be determined to 0.5 μas yr-1.
© EAS, EDP Sciences, 2002
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