Radio source positions from very-long-baseline interferometry observations

Details Radio source positions from very-long-baseline interferometry observations Radio source positions from very-long-baseline interferometry observations

Aug 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976aj.....81..599c&link_type=abstract

Astronomical Journal, vol. 81, Aug. 1976, p. 599-603. Research supported by the Swedish Natural Science Research Council and Swe

Astronomy and Astrophysics

Astronomy

42

Extragalactic Radio Sources, Position (Location), Radio Interferometers, Radio Sources (Astronomy), Astronomical Catalogs, Data Reduction, Eclipsing Binary Stars, Reference Stars

Scientific paper

Accurate positions of compact radio sources have been determined from very-long-baseline interferometry (VLBI) observations based on the bandwidth-synthesis technique. The coordinates for 18 extragalactic sources were obtained from sets of observations spread over the period from April 1972 to January 1975; the scatter among the independent determinations of the source coordinates from the separate sets of observations is about 0.05 arcsec, except for the declinations of near-equatorial sources, where the scatter is about 0.15 arcsec. Comparison of these positions with those determined with the Cambridge 5-km radio interferometer shows the rms scatter about the mean difference to be about 0.04 arcsec in each coordinate (no sources of low declination were in common). A similar comparison of the present results with those obtained by the Jet Propulsion Laboratory from separate VLBI observations yields a slightly larger rms scatter, after exlusion of the declinations of the near-equatorial sources. A position is also obtained for the galactic object Beta Persei (Algol), which agrees well with the position given in the FK 4 catalogue.

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