Celestial Reference Frames in the Gaia era

Details Celestial Reference Frames in the Gaia era Celestial Reference Frames in the Gaia era

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sf2a.conf...33b&link_type=abstract

SF2A-2009: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics, held 29 June - 4 July 2009 in

Astronomy and Astrophysics

Astrophysics

Scientific paper

A working meeting about Gaia and celestial reference frames, funded by the French AS-Gaia, took place in Bordeaux in October~2008. Researchers from Paris, Nice and Bordeaux observatories met in order to lay the foundations of future studies and collaborations in this field. The fundamental celestial reference system is materialized by the International Celestial Reference Frame (ICRF), based on the VLBI (Very Long Baseline Interferometry) position of extragalactic radio sources with sub-milliarcsecond accuracy. On the basis of at least 10,000 Quasi Stellar Objects (QSOs), Gaia will permit to create its own celestial reference frame by 2015--2020, with an unprecedented positional accuracy (ranging from a few tens of microarcseconds (μas) at magnitude 15--18 to about 200 μas at magnitude 20). For consistency between optical and radio positions, it will be important in the future to align these two frames (the Gaia reference frame and the ICRF) with the highest accuracy. This alignment will be important not only for guaranteeing the proper transition if moving from the radio domain to the optical domain, but also for registering the radio and optical images of any celestial target with the highest accuracy. In this paper, we present the context and the goals of this meeting, review the work carried out in each of the three observatories, and present the outcome of the meeting as well as prospects for the future.

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