Optical Spectra of Candidate International Celestial Reference Frame (ICRF) Flat-Spectrum Radio Sources. III
ASTRONOMICAL JOURNAL(2017)
Abstract
In extending our spectroscopic program, which targets sources drawn from the International Celestial Reference Frame ( ICRF) Catalog, we have obtained spectra for similar to 160 compact, flat-spectrum radio sources and determined redshifts for 112 quasars and radio galaxies. A further 14 sources with featureless spectra have been classified as BL Lac objects. Spectra were obtained at three telescopes: the 3.58m European Southern Observatory New Technology Telescope, and the two 8.2m Gemini telescopes in Hawaii and Chile. While most of the sources are powerful quasars, a significant fraction of radio galaxies is also included from the list of non-defining ICRF radio sources.
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Key words
BL Lacertae objects: general,galaxies: active,quasars: emission lines,radio continuum: general,reference systems
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