Véron & Véron based extragalactic reference frame

Details Véron & Véron based extragalactic reference frame Véron & Véron based extragalactic reference frame

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jsrs.meet..228a&link_type=abstract

In: Journées 2004 - systèmes de référence spatio-temporels. Fundamental astronomy: new concepts and models for high accuracy obs

Astronomy and Astrophysics

Astronomy

1

Extragalactic Reference Frames

Scientific paper

The Gaia Extragalactic Celestial Reference Frame (GCRF) will be formed by about 500,000 quasars, up to magnitude G=20, to typical precision of 100 μas. It is pivotal for many of the mission objectives, starting with the astrometry catalogue. We present a restricted representation of the GCRF, based on the Véron-Cetty & Véron list of 48,921 quasars. This representation brings the original list to a fully coherent placement on the ICRS. The sources positions have been collected from the USNO B1.0 catalog, which is complete to V=20. Around each source, fields of size as small as 6' were detailed, in which were picked up B1.0 stars and their corresponding positions from catalogs extending the HCRS to dimmer magnitudes. The UCAC2 (48 million stars, to R=16, precise to 50 mas) and the 2MASS (470 million objects, complete to J=16, precise to 100 mas) acted as the astrometric reference catalogs. Taking as paradigm the B1.0 positions corrected by the UCAC2, it is obtained a reference frame containing 37,513 quasars, globally aligned to 1 mas with the ICRF. The optical minus radio standard deviation is at 150 mas, much smaller than the nominal 200 mas B1.0 accuracy (the o-r standard deviation is above 300 mas for the original V&V entries). The extragalactic reference frame so obtained enables to gather insights on the distribution and luminosity of the GCRF. At the same time it provides an useful frame for all purpose observations.

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