J/ApJS/201/23ivo://CDS.VizieR/J/ApJS/201/23doi:10.26093/cds/vizier.22010023CDSEracleous M.Boroson T.A.Halpern J.P.Liu J.2017-06-01T08:52:33Z2012-11-08T15:00:51ZCDS support team

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

cds-question@unistra.frspectroscopyquasarsactive-galactic-nucleiWe have carried out a systematic search for subparsec supermassive black hole (BH) binaries among z<~0.7 Sloan Digital Sky Survey quasars. These are predicted by models of supermassive BH and host galaxy coevolution, therefore their census and population properties constitute an important test of these models. In our working hypothesis, one of the two BHs accretes at a much higher rate than the other and carries with it the only broad emission line region of the system, making the system analogous to a single-lined spectroscopic binary star. Accordingly, we used spectroscopic principal component analysis to search for broad H{beta} emission lines that are displaced from the quasar rest frame by |{Delta}{nu}|>~1000km/s. This method also yields candidates for rapidly recoiling BHs. Of the 88 candidates, several were previously reported in the literature. We found a correlation between the peak offset and skewness of the broad H{beta} profiles, suggesting a common physical explanation for these profiles. We carried out follow-up spectroscopic observations of 68 objects to search for changes in the peak velocities of the H{beta} lines.2012ApJS..201...23Ehttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/201/23CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)J/AJ/140/390 : Karhunen-Loeve transform of SDSS QSOs (Boroson+, 2010)J/ApJ/699/800 : Mass functions of active black holes (Vestergaard+, 2009)J/ApJ/692/758 : BAL QSOs in SDSS-DR5 (Gibson+, 2009)J/ApJ/683/L115 : Intermediate-line region in quasars (Hu+, 2008)J/ApJ/674/668 : SDSS J102839.11+450009.4 FeII emission lines (Wang+, 2008)J/AJ/126/1720 : ugriz and H{alpha} of double-peaked AGN (Strateva+, 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/201/23https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/201/23http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/201/23https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/201/23https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/201/23http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/201/23GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/201/23/lines (Properties of narrow- and broad-line profiles)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/201/23/lines?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/201/23/lines?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/201/23/lines?GETtext/xml+votable180.050000true3.1000833-10.37394440.0055555555555555566/1703 4258 4309 4952 4984 5002 5247 5498 5586 5594 5683 5749 5831 5881 5898 5985 5996 6109 6240 6544 6563 6619 6633 7256 7321 7345 7537 8300 8451 8460 8486 8523 8606 8668 8943 9181 9329 9459 9484 9519 9614 9768 10115 10234 10321 10558 10571 10648 10774 10786 10984 11014 11146 11335 11446 11825 17251 17497 17499 17668 17727 18096 21844 26057 26316 26412 26614 27043 27105 27108 27255 27287 27317 27331 27656 27758 27826 27850 27982 28120 28161 28293 28351 31375 31462 31679 31728 32519https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/201/23?format=asciiOpticaldefaultJ/ApJS/201/23/linesProperties of narrow- and broad-line profilesSDSSSimbad column added by the CDSmeta.id;meta.maincharprimaryl_Ne5Limit flag on Ne5meta.code.errorcharl_O2Limit flag on O2meta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject name (JHHMMSS, shortened SDSS name)meta.idcharf_Name[f] two sets of narrow lines (1)meta.codecharNe5? Observed [NeV]/[OIII] flux ratio (2)phot.flux;arith.ratiofloatnullableu_Ne5Uncertainty flag on Ne5 (3)meta.code.errorcharO2? Observed [OII]/[OIII] flux ratio (2)phot.flux;arith.ratiofloatnullableu_O2Uncertainty flag on O2 (3)meta.code.errorcharl_Ne3Limit flag on Ne3meta.code.errorcharNe3? Observed [NeIII]/[OIII] flux ratio (2)phot.flux;arith.ratiofloatnullableu_Ne3Uncertainty flag on Ne3 (3)meta.code.errorcharl_HbLimit flag on Hbmeta.code.errorcharHbObserved H{beta}/[OIII] flux ratio (2)phot.flux;arith.ratiofloatO3Observed [OIII] flux; erg/s/cm^2^ (2)mW.m**-2phot.flux;arith.ratiodoublel_Ne5.cLimit flag on Ne5.cmeta.code.errorcharNe5.c? Corrected [NeV]/[OIII] flux ratio (4)phot.flux;arith.ratiofloatnullableu_Ne5.cUncertainty flag on Ne5.c (3)meta.code.errorcharl_O2.cLimit flag on O2.cmeta.code.errorcharO2.c? Corrected [OII]/[OIII] flux ratio (4)phot.flux;arith.ratiofloatnullableu_O2.cUncertainty flag on O2.c (3)meta.code.errorcharl_Ne3.cLimit flag on Ne3.cmeta.code.errorcharNe3.c? Corrected [NeIII]/[OIII] flux ratio (4)phot.flux;arith.ratiofloatnullableu_Ne3.cUncertainty flag on Ne3.c (3)meta.code.errorcharl_Hb.cLimit flag on Hb.cmeta.code.errorcharHb.cCorrected H{beta}/[OIII] flux ratio (4)phot.flux;arith.ratiofloatO3.cCorrected [OIII] flux; erg/s/cm^2^ (4)mW.m**-2phot.flux;arith.ratiodoubleLumO3The [OIII] luminosity; erg/s (5)1e-07Wphys.luminositydoubleWNe5? Full-Width at Half-Maximum of [NeV] (6)km/sspect.line.widthintnullableWNe3? Full-Width at Half-Maximum of [OII] (6)km/sspect.line.widthintnullableWHb? Full-Width at Half-Maximum of H{beta} (6)km/sspect.line.widthintnullableWO3Full-Width at Half-Maximum of [OIII] (6)km/sspect.line.widthintDR7Display the data from the SDSS-DR7 quasar catalog within 1.5"meta.ref.urlcharSloanDisplay the SDSS online data for this quasarmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.refcharNEDSimbad column added by the CDSmeta.refcharFWHM? Full-Width at Half-Maximum of H{beta} linekm/sspect.line.widthintnullableFWQM? Full-Width at Quarter-Maximum of H{beta} linekm/sspect.line.widthintnullabledVp? H{beta} peak velocity shiftkm/sphys.atmol.lineShift;stat.maxintnullablee_dVp? Uncertainty in dVpkm/sstat.errorintnullabledVc? H{beta} centroid velocity shiftkm/sphys.atmol.lineShift;spect.lineintnullablesigma? Velocity dispersionkm/sphys.veloc.dispersionintnullableSkew? Skewness coefficientstat.fit.paramfloatnullablePSkew? Pearson skewness coefficientstat.fit.paramfloatnullable_RAPosition, from SDSS name (right ascension part)degpos.eq.ra;meta.main_DEPosition, from SDSS name (declination part)degpos.eq.dec;meta.mainJ/ApJS/201/23/table1Log of spectroscopic observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS name (HHMMSS.ss+DDMMSS.s; J2000)meta.id;meta.maincharz[0.0767/0.7128] Redshift (1)src.redshiftfloatVmag[15.81/19.83] Apparent V band magnitude (2)magphot.mag;em.opt.VfloatAVGalactic visual extinction (3)magphys.absorption.galfloatVMagAbsolute V band magnitude (2)magphys.magAbs;em.opt.VfloatDateUT date of the observationtime.epoch;obsnullableInstrInstrument code (4)meta.code;instrcharExpExposure timestime.duration;obs.exposureintS/N[4/88] Signal-to-noise ratio (5)stat.snrintlam1Lower rest-frame wavelength0.1nminstr.bandwidthintlam2Upper rest-frame wavelength0.1nminstr.bandwidthint