Radio dichotomy of active galactic nuclei J/PASJ/74/239 ivo://CDS.VizieR/J/PASJ/74/239 CDS Xiao H. Zhu J. Fu L. Zhang S. Fan J. 2023-07-03T13:25:07Z 2022-09-30T14:52:45Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr active-galactic-nuclei quasars radio-sources The question of radio dichotomy in active galactic nuclei (AGNs) is still in debate, even though it has been discussed for more than 40 years. In order to solve this old riddle, we collect a sample of AGNs with optical B band and radio 6 cm wavelength data to analyze the radio loudness log R. Our results indicate a separation of log R=<1.37+/=0.02> between radio-loud (RL) AGNs and radio-quiet (RQ) AGNs, suggesting the existence of an RL/RQ dichotomy. For the first time, we suggest combining radio luminosity and radio loudness as a double criterion to divide AGNs into RLs and RQs to avoid misclassification problems that may happen in the single-criterion scenario; we propose the double-criterion dividing line log L_6cm_=-2.7logR+44.3 by using a machine-learning method. In addition, the key point of the RL/RQ dichotomy is the origin of radio emission for the two classes, and we suggest the radio emission from RLs and RQs share the same origin, e.g., jets and mini-jets (aborted-jet or outflow), through a correlation study between radio 6 cm luminosity and optical B-band luminosity. 2022PASJ...74..239X https://cdsarc.cds.unistra.fr/viz-bin/cat/J/PASJ/74/239 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to VII/258 : Quasars and Active Galactic Nuclei (13th Ed.) (Veron+ 2010) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/PASJ/74/239 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/PASJ/74/239 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/PASJ/74/239 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/PASJ/74/239 https://vizier.iucaa.in/viz-bin/votable?-source=J/PASJ/74/239 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/PASJ/74/239 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/PASJ/74/239/table1 (Radio sources of our sample) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/PASJ/74/239/table1? https://vizier.iucaa.in/viz-bin/conesearch/J/PASJ/74/239/table1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/PASJ/74/239/table1? 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49128 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/PASJ/74/239?format=ascii Radio default J/PASJ/74/239/table1 Radio sources of our sample Name Source name (1) meta.id;meta.main char recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Class [ABQ] Sources classification (1) (2) meta.code.class char z Redshift (1) src.redshift float F6cm Radio flux density at 6 cm (1) Jy phot.flux.density;em.radio.3-6GHz float Vmag Optical magnitude at V band (1) mag phot.mag;em.opt.V float B-V Color index of B-V (1) mag phot.color;em.opt.B;em.opt.V float E(B-V) Galaxy extinction mag phot.color.excess float RClass [RL RQ] New classification at radio band in this work (3) meta.code.class char _RA Positions from Quasars and Active Galactic Nuclei (13th Ed.), Veron-Cetty and Veron (2010, Cat. VII/258) (right ascension part) deg pos.eq.ra;meta.main _DE Positions from Quasars and Active Galactic Nuclei (13th Ed.), Veron-Cetty and Veron (2010, Cat. VII/258) (declination part) deg pos.eq.dec;meta.main