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We present the results of spectroscopic observations of the opticalcounterparts of 47 southern radio sources from the candidate InternationalCelestial Reference Catalogue (ICRC), as part of a Very Long BaselineInterferometry (VLBI) program to strengthen the celestial reference frame,especially in the south. The observations were made with the 3.58-meterEuropean Southern Observatory New Technology Telescope (NTT). We obtainedredshifts for 30 quasars and one radio galaxy, with a further 7 objects beingprobable BL Lac objects with featureless spectra. Of the remainder, four wereclear misidentifications with Galactic stars and five had low signal-to-noisespectra and could not be classified. These results, in combination with newVLBI data of the radio sources with redshifts more than 2, add significantly tothe existing data needed to refine the distribution of source proper motionsover the celestial sphere.

Optical Spectra of Candidate Southern Hemisphere International Celestial Reference Frame (ICRF) radio sources