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In extending our spectroscopic program, which targets sources drawn from theInternational Celestial Reference Frame (ICRF) Catalog, we have obtainedspectra for about 160 compact flat-spectrum radio sources and determinedredshifts for 112 quasars and radio galaxies. A further 14 sources withfeatureless spectra have been classified as BL Lac objects. Spectra wereobtained at three telescopes: the 3.58-m ESO New Technology Telescope (NTT),and the two 8.2-m Gemini telescopes in Hawaii and Chile. While most of thesources are powerful quasars, a significant fraction of radio galaxies is alsoincluded from the list of non-defining ICRF radio sources.

Optical Spectra of Candidate International Celestial Reference Frame (ICRF) Flat-Spectrum Radio Sources. III