J/ApJ/831/168ivo://CDS.VizieR/J/ApJ/831/168doi:10.26093/cds/vizier.18310168CDSKellermann K.I.Condon J.J.Kimball A.E.Perley R.A.Ivezic Z.2018-02-06T12:47:12Z2017-04-21T13:13:18ZCDS support team

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

cds-question@unistra.frquasarsradio-continuum-emissionvisible-astronomysloan-photometryredshiftedWe discuss 6GHz JVLA observations covering a volume-limited sample of 178 low-redshift (0.2<z<0.3) optically selected quasi-stellar objects (QSOs). Our 176 radio detections fall into two clear categories: (1) about 20% are radio-loud QSOs (RLQs) with spectral luminosities of L_6_>~10^23.2^W/Hz that are primarily generated in the active galactic nucleus (AGN) responsible for the excess optical luminosity that defines a bona fide QSO; and (2) the remaining 80% that are radio-quiet QSOs (RQQs) that have 10^21^<~L_6_<~10^23.2^W/Hz and radio sizes <~10kpc, and we suggest that the bulk of their radio emission is powered by star formation in their host galaxies. "Radio-silent" QSOs (L_6_<~10^21^W/Hz) are rare, so most RQQ host galaxies form stars faster than the Milky Way; they are not "red and dead" ellipticals. Earlier radio observations did not have the luminosity sensitivity of L_6_<~10^21^W/Hz that is needed to distinguish between such RLQs and RQQs. Strong, generally double-sided radio emission spanning >>10kpc was found to be associated with 13 of the 18 RLQ cores with peak flux densities of S_p_>5mJy/beam (log(L)>~24). The radio luminosity function of optically selected QSOs and the extended radio emission associated with RLQs are both inconsistent with simple "unified" models that invoke relativistic beaming from randomly oriented QSOs to explain the difference between RLQs and RQQs. Some intrinsic property of the AGNs or their host galaxies must also determine whether or not a QSO appears radio-loud.2016ApJ...831..168Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/831/168CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)J/MNRAS/455/4191 : Radio emission from radio-quiet quasars (Zakamska+, 2016)J/ApJ/798/134 : MOJAVE. XII. Acceleration of blazar jets (Homan+, 2015)J/MNRAS/444/2498 : Radio-Quiet BAL quasars sample (Rochais+, 2014)J/MNRAS/440/476 : Low-redshift quasars in SDSS Stripe 82 (Falomo+, 2014)J/MNRAS/436/3759 : ECDFS sources optical/IR counterparts (Bonzini+, 2013)J/ApJS/205/13 : VLA 1.4GHz survey of ECDF-S (DR2) (Miller+, 2013)J/ApJ/768/37 : Radio emission from SDSS quasars (Condon+, 2013)J/MNRAS/421/1569 : Properties of 18286 SDSS radio galaxies (Best+, 2012)J/AJ/138/1874 : MOJAVE VI. Kinematic analysis of blazar jets (Lister+, 2009)J/AJ/137/42 : Matched SDSS and FIRST Sample (Rafter+, 2009)J/ApJS/179/114 : VLA 1.4GHz survey of E-CDF-S (Miller+, 2008)J/ApJS/179/71 : VLA survey of the CDF-S I. (Kellermann+, 2008)J/MNRAS/383/1513 : 2MASS, SDSS and FIRST fluxes of QSOs (Labita+, 2008)J/ApJ/658/815 : Radio loudness of active galactic nuclei (Sikora+, 2007)J/MNRAS/341/993 : u_j_br photometry and redshifts of QSOs (Cirasuolo+, 2003)J/ApJS/126/133 : The FIRST bright quasar survey. II. (White+, 2000)J/ApJ/511/612 : Comparison of Radio-loud & Quiet QSOs (Goldschmidt+, 1999)J/AJ/108/1163 : Radio structure of Quasars (Kellermann+ 1994)J/MNRAS/263/425 : Low-z BQS Quasars (Miller+, 1993)J/ApJ/269/352 : Quasar evolution (Schmidt+, 1983)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/831/168https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/831/168http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/831/168https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/831/168https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/831/168http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/831/168GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/831/168/table1 (Results)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/831/168/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/831/168/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/831/168/table1?GETtext/xml+votable180.050000true118.51548.24111110.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/ApJ/831/1686/4101 4181 4289 4290 4309 4411 4418 4438 4462 4463 4471 4510 4536 4545 4604 4702 4911 5070 5175 5202 5216 5220 5247 5274 5377 5384 5481 5483 5498 5599 5610 5647 5680 5685 5687 5733 5820 5821 5825 5831 5855 5865 5947 5957 6015 6473 6501 6515 6593 6600 6608 6633 7222 7256 7280 7321 7381 7397 7445 8246 8300 8324 8352 8577 8597 8631 8641 8700 8731 8742 8812 8848 8853 8863 8989 9016 9019 9031 9038 9072 9115 9200 9260 9322 9422 9471 9483 9948 9954 9967 9980 10017 10019 10115 10234 10390 10433 10470 10471 10578 10584 10612 10624 10647 10665 10674 10678 10709 10765 10830 10899 11276 11297 11382 11475 11502 11848 11854 11930 11936 19456 25586 25939 26019 26103 26225 26233 26237 26287 26297 26316 26396 26401 26406 26500 26614 26965 27002 27252 27331 27360 27475 27565 27580 27628 27653 27654 27686 27715 27784 27879 27894 27909 27924 27928 27983 28049 28067 28113 28138 28200 28282 28380 28471 28483 28508 28512 28552 28589 28629 28654 31315 31413 31535 31623 31635 324033.975641742184806e-24 2.821731604724377e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/831/168?format=asciiRadioOpticaldefaultJ/ApJ/831/168/table1ResultsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSource name (HHMMSS.SS+DDMMSS.S; J2000)meta.id;meta.maincharRAJ2000VLA hour of right ascension (J2000) (1)pos.eq.raDEJ2000VLA degree of declination (J2000) (1)pos.eq.decdelta[0/8.8] Separation between the radio and optical positionsarcsecpos.angDistancefloatz[0.2/0.3] Redshift from the SDSSsrc.redshiftfloatS6[16/770000] VLA 6GHz Integrated flux density ({mu}Jy)uJyphot.flux.density;em.radio.3-6GHzdoublee_S6[4/23103] rms error in S6 (2)uJystat.errorfloatS6pk[16/322000] 6GHz Peak flux density at 3.5" resolution (S_p_; {mu}Jy/beam solid angle)uJy/beamphot.flux.density;em.radio.3-6GHzdoublee_S6pk[4/9661] rms error in S6pkuJy/beamstat.errorfloatSpk/S[0.009/1] Ratio of peak to integrated flux densityphot.flux;arith.ratiofloatlogL[21.4/26.2] Log of 6GHz spectral luminosityW/Hzphys.luminosity;em.radiofloatimag[15.1/17.8] i-band apparent magnitude from the SDSS catalogmagphot.mag;em.opt.IfloatIMag[-24.8/-22.5] I-band absolute magnitudemagphot.mag;em.opt.IfloatRatio[0.01/523] Ratio of radio (6 GHz) to optical (i band) flux density (3)phot.flux;arith.ratiofloatAssocDataAssociated Data web pagemeta.ref.urlcharImgDownload the 6GHz VLA image fits file from the subdirectory "images"meta.ref.urlcharSloanDisplay the online SDSS data for the nearest objectmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlchar_RAPositions from SDSS names (right ascension part)degpos.eq.ra;meta.main_DEPositions from SDSS names (declination part)degpos.eq.dec;meta.main