Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2011-09-06
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
31 pages, 3 figures, AJ, accepted
Scientific paper
We present the results of spectroscopic observations of the optical counterparts of 47 southern radio sources from the candidate International Celestial Reference Catalogue (ICRC), as part of a Very Long Baseline Interferometry (VLBI) program to strengthen the celestial reference frame, especially in the south. The observations were made with the 3.58-meter European Southern Observatory New Technology Telescope (NTT). We obtained redshifts for 30 quasars and one radio galaxy, with a further 7 objects being probable BL Lac objects with featureless spectra. Of the remainder, four were clear misidentifications with Galactic stars and five had low signal-to-noise spectra and could not be classified. These results, in combination with new VLBI data of the radio sources with redshifts more than 2, add significantly to the existing data needed to refine the distribution of source proper motions over the celestial sphere.
Christensen Lars Lindberg
Hunstead Richard W.
Jauncey David L.
Johnston Helen M.
Titov Oleg
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