J/A+A/622/A11ivo://CDS.VizieR/J/A+A/622/A11doi:10.26093/cds/vizier.36220011CDSGuerkan G.Hardcastle M.J.Best P.N.Morabito L.K.Prandoni I.,Jarvis M.J.Duncan K.J.Calistro Rivera G.Callingham J.R.,Cochrane R.K.Croston J.H.Heald G.Mingo B.Mooney S.Sabater J.,Roettgering H.J.A.Shimwell T.W.Smith D.J.B.Tasse C.Williams W.L.2020-11-04T15:57:33Z2019-02-21T17:07:22ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frsurveysquasarsradio-sourcesThe radio-loud/radio-quiet (RL/RQ) dichotomy in quasars is still an open question. Although it is thought that accretion onto supermassive black holes in the centre the host galaxies of quasars is responsible for some radio continuum emission, there is still a debate as to whether star formation or active galactic nuclei (AGN) activity dominate the radio continuum luminosity. To date, radio emission in quasars has been investigated almost exclusively using high-frequency observations in which the Doppler boosting might have an important effect on the measured radio luminosity, whereas extended structures, best observed at low radio frequencies, are not affected by the Doppler enhancement. We used a sample of quasars selected by their optical spectra in conjunction with sensitive and high-resolution low-frequency radio data provided by the LOw Frequency ARray (LOFAR) as part of the LOFAR Two-Metre Sky Survey (LoTSS) to investigate their radio properties using the radio loudness parameter (R=L_144MHz_/L_iband_). The examination of the Li band radio continuum emission and RL/RQ dichotomy in quasars exhibits that quasars show a wide continuum of radio properties (i.e. no clear bimodality in the distribution of R). Radio continuum emission at low frequencies in low-luminosity quasars is consistent with being dominated by star formation. We see a significant albeit weak dependency of R on the source nuclear parameters. For the first time, we are able to resolve radio morphologies of a considerable number of quasars. All these crucial results highlight the impact of the deep and high-resolution low-frequency radio surveys that foreshadow the compelling science cases for the Square Kilometre Array (SKA).2019A&A...622A..11Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/622/A11CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)J/ApJS/228/9 : Physical parameters of ~300000 SDSS-DR12 QSOs (Kozlowski, 2017)J/A+A/622/A1 : LOFAR Two-metre Sky Survey DR1 source catalog (Shimwell+, 2019)J/A+A/622/A4 : LOFAR observations XMM-LSS field (Hale+, 2019)J/A+A/622/A8 : NGC 3184, 4736, 5055 and 5194 LOFAR & WSRT maps (Heesen+, 2019)J/A+A/622/A11 : LoTSS/HETDEX. Optical quasars. I. (Guerkan+, 2019)J/A+A/622/A13 : VLA double-double radio galaxy candidates imagesJ/A+A/622/A15 : Broad absorption line quasars in LDR1 (Morabito+, 2019)J/A+A/622/A22 : Abell 1914 multiwavelength radio images (Mandal+, 2019)J/A+A/622/A23 : LoTSS HCG and MLCG systems (Nikiel-wroczynski+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/622/A11https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/622/A11http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/622/A11https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/622/A11https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/622/A11http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/622/A11GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/622/A11/catalog (Measured properties of SDSS quasars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/622/A11/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/622/A11/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/622/A11/catalog?GETtext/xml+votable180.050000true161.228208354.84530560.0055555555555555563/162 4/349-351 369 372-374 642-643 646 652 669-671 685-687 689-694 696-698 706-707 713 1757 5/1375 1391 1395 1485 1487 1500 1509 1511 1520 2566-2567 2588 2590 2612 2614 2616-2617 2655 2671 2675 2688-2689 2691-2693 2735 2739 2780 2796 2800 2819 2822-2823 2834 2840 2842 2848-2849 2851 2857-2860 2864 2944 7005-7007 7037 6/5495 5499 5559 5563 5575 5579 5937 5939 5945 5947 6004 6008 6033 6084 6088 10253-10255 10258-10259 10262 10314 10358 10364 10366 10452 10454 10460 10472 10474 10480 10615 10617-10619 10677 10679 10683 10694-10695 10699 10760-10761 10776-10778 10780 10816 10939 10951 10955 11015 11019 11021-11023 11124 11128 11188 11192 11204 11208 11270-11271 11275 11282-11283 11286-11287 11342 11364 11366 11372 11400-11401 11403 11425-11427 11444 11446 11448 11450 11464-11466 11780 11784 28015 28019 28101 28103 28109 28111 28144-28145 28147 28157 28159 28501 285039.54153977050123e-26 9.54153977050123e-26https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/622/A11?format=asciiRadiodefaultJ/A+A/622/A11/catalogMeasured properties of SDSS quasarsSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS name (HHMMSS.ss+DDMMSS.s)meta.id;meta.mainchariMAGSDSS i-band magnitude (z=2 k-corrected)magphot.mag;em.opt.IdoubleLOFARUnique LOFAR name (ILTJHHMMSS.ss+DDMMSS.s) (1)meta.idcharF150LOFAR 144 MHz flux densityJyphot.flux.density;em.radio.100-200MHzdoublee_F150Error on LOFAR 144 MHz flux densityJystat.errordoubleF100? Herschel 100micron flux density (2)Jyphot.flux.density;em.IR.60-100umdoublenullablee_F100? Error on Herschel 100micron flux densityJystat.errordoublenullableF160? Herschel 160micron flux density (2)Jyphot.flux.density;em.mm.1500-3000GHzdoublenullablee_F160? Error on Herschel 160micron flux densityJystat.errordoublenullableF250? Herschel 250micron flux density (2)Jyphot.flux.density;em.mm.750-1500GHzdoublenullablee_F250? Error on Herschel 250micron flux densityJystat.errordoublenullableF350? Herschel 350micron flux density (2)Jyphot.flux.density;em.mm.750-1500GHzdoublenullablee_F350? Error on Herschel 350micron flux densityJystat.errordoublenullableF500? Herschel 500micron flux density (2)Jyphot.flux.density;em.mm.400-750GHzdoublenullablee_F500? Error on Herschel 500micron flux densityJystat.errordoublenullableRLRadio loudness parameterphot.flux;arith.ratiodoubleBHmass? Black hole mass (3)solMassphys.massfloatnullableEddratio? Eddington ratiophys.luminosity;arith.ratiodoublenullable_RAPositions from SDSS name (right ascension part)degpos.eq.ra;meta.mainindexed_DEPositions from SDSS name (declination part)degpos.eq.dec;meta.mainindexed