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

Created 17/10/2025

Updated 17/10/2025

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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 add significantly to the existing data needed to refine the distribution of source proper motions over the celestial sphere. Citation: Titov, O., Jauncey, D. L., Johnston, H. M., Hunstead, R. W., & Christensen, L. (2011). Optical spectra of candidate Southern Hemisphere International Celestial Reference Frame (ICRF) radio sources. The Astronomical Journal, 142(5), 165. https://doi.org/10.1088/0004-6256/142/5/165

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Title Optical Spectra of Candidate Southern Hemisphere International Celestial Reference Frame (ICRF) radio sources
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/en/dataset/5519e644-e5fe-4f88-b3fe-92f4ee61a9bf
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 22/07/2025
Geospatial Coverage
Map data © OpenStreetMap contributors
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      ],
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      ],
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      ],
      [
        -180.0,
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      ],
      [
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  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Optical Spectra of Candidate Southern Hemisphere International Celestial Reference Frame (ICRF) radio sources". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/optical-spectra-of-candidate-southern-hemisphere-international-celestial-reference-frame-icrf-r