3627 International Celestial Reference Frame sources Virtual Observatory Resource

Authors
  1. Hunt L.R.
  2. Johnson M.C.
  3. Cigan P.J.
  4. Gordon D.
  5. Spitzak J.
  6. Published by
    CDS
Abstract

The third iteration of the International Celestial Reference Frame (ICRF3) is made up of 4536 quasars observed at S/X bands using very-long-baseline interferometry. These sources are high-redshift quasars, typically between 1<z<2, that are believed to host active galactic nuclei at their centers. The position of compact radio sources can be determined better than sources with large amounts of extended radio structure. Here we report information on a series of 20 observations from 2017 January through December 2017 that were designed for precise astrometry and to monitor the structure of sources included in the ICRF3. We targeted 3627 sources over the one year campaign and found the median flux density of 2697 detected sources at S band is 0.13Jy, and the median flux density of 3209 sources detected at X band is 0.09Jy. We find that 70% of detected sources in our campaign are considered compact at X band and ideal for use in the ICRF and 89% of the 2615 sources detected at both frequencies have a flat spectral index, {alpha}>0.5

Keywords
  1. quasars
  2. active-galactic-nuclei
  3. radio-spectroscopy
Bibliographic source Bibcode
2021AJ....162..121H
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/162/121
IVOA Identifier IVOID
ivo://CDS.VizieR/J/AJ/162/121
Document Object Identifer DOI
doi:10.26093/cds/vizier.51620121

Access

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http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/162/121
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/162/121
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/162/121
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http://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/162/121/table4?
https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/162/121/table4?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/162/121/table4?

History

2021-12-22T07:34:52Z
Resource record created
2021-12-22T07:34:52Z
Created
2022-03-16T12:11:36Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr