Milliarcsecond Accurate Astrometry for Extension of the ICRF in the Southern Hemisphere

Details Milliarcsecond Accurate Astrometry for Extension of the ICRF in the Southern Hemisphere Milliarcsecond Accurate Astrometry for Extension of the ICRF in the Southern Hemisphere

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.9903f&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #99.03; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astrophysics

Scientific paper

We report new milliarcsecond accurate radio positions in the International Celestial Reference Frame for 74 Southern Hemisphere radio sources obtained by a continuing VLBI research program in Southern Hemisphere astrometry and imaging which is a collaboration between the U.S. Naval Observatory, the Australia Telescope National Facility and associated facilities. These results are part of an effort to increase the sky density of Southern Hemisphere sources with accurate positions in order to better define the ICRF and to provide additional phase-reference sources for use in astrophysical observations. The positions for all these sources are south of declination -20 degrees and they represent the largest group of new milliarcsecond accurate astrometric positions for sources in this declination range since the initial definition of the ICRF. The impact of these new sources on the improvement of the ICRF in the Southern Hemisphere will be discussed.

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