ICRF3 sources monitoring with VLBA J/AJ/162/121 ivo://CDS.VizieR/J/AJ/162/121 doi:10.26093/cds/vizier.51620121 CDS Hunt L.R. Johnson M.C. Cigan P.J. Gordon D. Spitzak J. 2026-05-18T20:04:32Z 2021-12-22T07:34:52Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr quasars active-galactic-nuclei radio-spectroscopy 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 2021AJ....162..121H https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/162/121 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to J/A+A/544/A34 : Bright AGN VLBI imaging study at 2 and 8GHz (Pushkarev+, 2012) J/AJ/150/58 : VLBI ICRF2 (Fey+, 2015) J/AJ/151/154 : Second epoch VLBA Calibrator Survey (VCS-II) (Gordon+, 2016) J/A+A/644/A159 : The third realization of the ICRF, ICRF3 (Charlot+, 2020) https://cds.unistra.fr/vizier-org/licences_vizier.html https://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 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/162/121 https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/162/121 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/162/121 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/AJ/162/121/table4 (Radio properties of ICRF sources) https://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? 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43451 43483 43501 43549 43566 43578 43595 43616 43628 43633 43694 43712 43739 43753 43757 43765 43786 43821-43822 43828 43835 43837 43841 43854 43863 43865 43870 43876 43888 43891 43914 43916 43918 43924 43954 43956 43967 43978 43980 43986 43995 44000 44034-44035 44047 44052 44059 44075 44088 44099 44106 44113 44122 44128 44131 44147 44149 44155 44166 44170 44208 44260 44265 44269 44272 44282 44293 44307 44313 44335 44338 44350 44358 44361 44365 44377 44381 44389 44392 44412 44441 44443 44449 44468 44484 44489 44513 44523 44525-44526 44534 44542 44547 44554 44563 44574 44597 44600 44612 44641 44648-44650 44656 44661 44669-44670 44681 44695 44699-44700 44705 44711 44714-44715 44717-44718 44724 44729-44730 44735 44742 44753 44761 44774 44776 44799 44802 44809 44815 44840 44873 44885 44896 44899 44907-44908 44911 44937 44944 44955 45006 45026 45044 46040 46331 46379 46388 46394 46398 46419 46439 46444 46448 46529 46542 46545 46552 46562 46568 46709 46717 46739 46762 46764 46782 46801 46810 46831 46835 46859 46867-46868 46887 46893 46921 46931 46939 46948 46963-46966 47001 47050 47057 47064 47070 47080 47093 47095 47354 47419 47453 47470 47478 47534 47540 47585 47605 47672 47675 47747 47796 47805 47847 47882 47912 47922 47943 47945 47969 47971 47978 47980 48023 48025 48047-48048 48053 48063 48091 48102 48123-48124 48126 48143 48182 48187 48207 48228 48238 48252 48286 48292 48300 48306 48310 48315 48341 48345 48362 48388 48392 48398 48404 48407 48420-48422 48433-48434 48460 48476 48483 48491 48493 48496 48507 48513-48514 48529-48530 48533 48535 48538 48541-48542 48546 48582 48595 48605 48610 48618 48629 48646 48648 48660 48666 48685 48693 48708 48715-48716 48724 48729 48732 48736 48744 48757-48758 48761 48767 48783 48786 48792 48797-48798 48814 48816 48821 48846 48885 48890 48893 48901 48918 48952 48995 49002 49014 49019 49023 49029 49037 49049 49069 49083-49084 49097 49127 1.5239959695752804e-24 5.764680399785721e-24 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/162/121?format=ascii Radio default J/AJ/162/121/table4 Radio properties of ICRF sources recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int IERS Source IERS Name meta.id;meta.main char m_IERS Number of observations for this source meta.number int nullable RAICRS [0/360] Right ascension (ICRF) at Ep=2015.0 (1) deg pos.eq.ra;meta.main DEICRS [-50/89] Declination (ICRF) at Ep=2015.0 (1) deg pos.eq.dec;meta.main alpha [-5.1/4.9]? Clean 2.3GHz to 8.7GHz spectral * index spect.index;em.radio.3-6GHz float nullable Session Session (2) meta.code char Obs [2017] Observation, year time.epoch Srms-t [0.0001/0.008]? 2.3GHz theoretical RMS in image mJy/beam instr.det.noise double nullable Srms [4.1e-5/1.4]? 2.3GHz measured RMS in image mJy/beam instr.det.noise double nullable Speak [7.9e-5/5.6]? 2.3GHz peak flux density of the brightest pixel Jy/beam phot.flux.density;em.radio.1500-3000MHz double nullable Stot [0.001/7.9]? 2.3GHz total flux density (3) Jy phot.flux.density;em.radio.1500-3000MHz double nullable Sgau [0.003/6.9]? 2.3GHz Gaussian fit flux density (4) Jy phot.flux.density;em.radio.1500-3000MHz double nullable Ssnr [1.2/866]? 2.3GHz Signal-to-noise ratio (5) stat.snr float nullable Xrms-t [9.1e-5/0.006]? 8.7GHz theoretical RMS in image mJy/beam instr.det.noise double nullable Xrms [0.0001/1.9]? 8.7GHz measured RMS in image mJy/beam instr.det.noise double nullable Xpeak [0.005/7.2]? 8.7GHz peak flux density of the brightest pixel Jy/beam phot.flux.density;em.radio.6-12GHz double nullable Xtot [0.009/7.6]? 8.7GHz total flux density (3) Jy phot.flux.density;em.radio.6-12GHz double nullable Xgau [-1.8e6/7.5]? 8.7GHz Gaussianfit flux density (4) Jy phot.flux.density;em.radio.6-12GHz double nullable Xsnr [0.4/1776]? 8.7GHz Signal-to-noise ratio (5) stat.snr float nullable