Densification of the International Celestial Reference Frame in the Northern Hemisphere

Details Densification of the International Celestial Reference Frame in the Northern Hemisphere Densification of the International Celestial Reference Frame in the Northern Hemisphere

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sf2a.conf...11c&link_type=abstract

SF2A-2004: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 14-18, 2004. Edited by F. Combes, D. Barret

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Scientific paper

The current realization of the International Celestial Reference Frame (ICRF) comprises a total of 717 extragalactic radio sources distributed over the entire sky. We present an observing program underway to densify the ICRF in the northern hemisphere using the European VLBI network (EVN) and other geodetic antennas in Spitsbergen, Canada and USA. The approach used in this project is designed to improve the overall source distribution in the ICRF by filling the ``empty regions'' of the frame. A total of 150 new sources at specific sky locations have been observed for this purpose during three EVN experiments. Only sources with no or limited extended VLBI structures have been selected for this densification in order to ensure high astrometric accuracy.

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