Véron&Véron Based Optical Extragalactic Reference Frame - Progress Report

Details Véron&Véron Based Optical Extragalactic Reference Frame - Progress Report Véron&Véron Based Optical Extragalactic Reference Frame - Progress Report

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..16e...5a&link_type=abstract

Nomenclature, Precession and New Models in Fundamental Astronomy, 26th meeting of the IAU, Joint Discussion 16, 22-23 August 200

Astronomy and Astrophysics

Astronomy

Scientific paper

The axis of the International Celestial Reference System (ICRS) are defined by positions of extragalactic sources. The International Celestial Reference Frame (ICRF) is the materialization of the ICRS. The ICRF catalog consists of VLBI radio positions of point-like quasars of astro-geodetic observations over many years. At optical wavelengths the standard materialization of the ICRS is the Hipparcos stellar catalogue. In this project, the aim is to build a dense, optical extagalactic reference frame on the ICRS, directly aligned by the ICRF, and bridging the magnitude gap to the Hipparcos frame Here we report on the addition of 62,021 quasars from the SDSS Fourth Release, most of which are not part of the original Veron & Veron 48,921 list of quasars. The added sources are not all-sky distributed, however they do present a much larger spatial density (over 10/sq.deg). Stars within a radius of 10 arcmin around each of the selected SDSS extragalactic objects were also retrieved from SDSS data. Typically there are 2,000 stars in each such region. Using the UCAC2 as reference star catalog this enables an accurate astrometry independent of the USNO B1.0 catalog. The preliminary B1.0 positions are locally corrected using UCAC2 stars. Now, the northernmost portion of the V&V list is also corrected using preliminary extracts of the UCAC2. With this project the sample of quasars with precise radio position was expanded to 4,400 objects (30% increase). Preliminary reductions using harmonic functions relate the VLBI obtained positions to the Hipparcos frame (through the UCAC2). The final positions are precise to better than 100mas, while the resulting frame adheres to the ICRF at the level of 1mas

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