J/ApJS/221/7ivo://CDS.VizieR/J/ApJS/221/7doi:10.26093/cds/vizier.22210007CDSRunnoe J.C.Eracleous M.Mathes G.Pennell A.Boroson T.,Sigurosson S.Bogdanovic T.Halpern J.P.Liu J.2023-06-09T09:36:55Z2016-02-04T12:52:13ZCDS support team

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

cds-question@unistra.frquasarsgalaxy-kinematicsredshiftedspectroscopyline-intensitiesWe present new spectroscopic observations that are part of our continuing monitoring campaign of 88 quasars at z<0.7 whose broad H{beta} lines are offset from their systemic redshifts by a few thousand km/s. These quasars have been considered as candidates for hosting supermassive black hole binaries (SBHBs) by analogy with single-lined spectroscopic binary stars. We present the data and describe our improved analysis techniques, which include an extensive evaluation of uncertainties. We also present a variety of measurements from the spectra that are of general interest and will be useful in later stages of our analysis. Additionally, we take this opportunity to study the variability of the optical continuum and integrated flux of the broad H{beta} line. We compare the variability properties of the SBHB candidates to those of a sample of typical quasars with similar redshifts and luminosities observed multiple times during the Sloan Digital Sky Survey. We find that the variability properties of the two samples are similar (variability amplitudes of 10%-30% on timescales of approximately 1-7 years) and that their structure functions can be described by a common model with parameters characteristic of typical quasars. These results suggest that the broad-line regions of SBHB candidates have a similar extent as those of typical quasars. We discuss the implications of this result for the SBHB scenario and the ensuing constraints on the orbital parameters.2015ApJS..221....7Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/221/7CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/270 : SDSS quasar catalog: tenth data release (Paris+, 2014)J/ApJ/799/72 : Binary AGNs from the VLA Stripe 82 survey (Fu+, 2015)J/ApJ/779/109 : Long-term monitoring of NGC 5548 (Peterson+, 2013)J/ApJ/777/64 : A search for double-peaked AGNs in AGES (Comerford+, 2013)J/ApJ/769/95 : [NeV] or [NeIII] double peaked SDSS quasars (Barrows+, 2013)J/MNRAS/426/1701 : High-frequency QPO in black hole binaries (Belloni+, 2012)J/ApJS/201/31 : Emission-line galaxies from SDSS. I. (Ge+, 2012)J/ApJS/201/23 : Spectroscopy of 88 z<0.7 SDSS QSOs (Eracleous+, 2012)J/ApJ/753/42 : Double-peaked AGN. I. Dual AGN candidates (Comerford+, 2012)J/ApJ/746/L22 : Dual AGNs in the nearby Universe (Koss+, 2012)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/716/866 : SDSS search for binary AGN (Smith+, 2010)J/ApJ/708/427 : Type 2 AGNs with double-peaked [OIII] lines (Liu+, 2010)J/ApJ/705/L76 : AGNs with double-peaked [OIII] lines (Wang+, 2009)J/A+A/417/515 : I Zw 1 unusual emission line spectrum (Veron-Cetty+, 2004)J/ApJ/599/886 : Emission lines of radio-loud AGN (Eracleous+, 2003)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/221/7https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/221/7http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/221/7https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/221/7https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/221/7http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/221/7GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/221/7/table1 (Log of Spectroscopic Observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/221/7/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/221/7/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/221/7/table1?GETtext/xml+votable180.050000true3.100125-10.37394440.0055555555555555566/1703 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/221/7?format=asciidefaultJ/ApJS/221/7/table1Log of Spectroscopic ObservationsSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlam1[2462/4628]? Lower rest-frame wavelength range0.1nminstr.bandwidthintnullablelam2[3869/8824]? Upper rest-frame wavelength range0.1nminstr.bandwidthintnullableID[001224/180545] Abbreviated object SDSS identifier (as in tables 3 and 4; column added by CDS)meta.idintprimaryPapIDisplay data from Paper I (Eracleous+, 2012, J/ApJS/201/23) within 1"meta.ref.urlintnullableNEDNED column added by the CDSmeta.ref.urlcharLEDAmeta.ref.urlchar_RAPositions from SDSS names (right ascension part)degpos.eq.ra;meta.main_DEPositions from SDSS names (declination part)degpos.eq.dec;meta.mainSDSSObject SDSS name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharz[0.07/0.8] Spectroscopic redshift (1)src.redshiftfloatVmag[15.8/19.9] Apparent V band magnitude (2)magphot.mag;em.opt.VfloatAv[0.02/0.7] Galactic visual extinction in V band (3)magphys.absorption.galfloatVMag[-26.3/-21.2] Absolute V band magnitude (4)magphys.magAbsfloatNo[2/17] Total number of observations (5)meta.numberintDate? UT date of the observationtime.epoch;obsnullableFlag[hN] Observation flag (6)meta.code.errorcharInstrInstrument code (7)meta.code;instrcharExp[480/7200]? Exposure timestime.duration;obs.exposureintnullableS/N[3/134]? Signal-to-Noise (8)stat.snrintnullableJ/ApJS/221/7/table3Spectral measurements for broad H{beta}FWQMFull-Width at Quarter-Maximumkm/sspect.line.widthintID[001224/180545] Abbreviated object SDSS identifiermeta.idintprimaryDate? UT date of the observationtime.epoch;obsnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFWHM[1900/19800] Full-Width at Half-Maximumkm/sspect.line.widthinte_FWHM[60/4000] Uncertainty in FWHMkm/sstat.error;phys.angSizeinte_FWQMUncertainty in FWQMkm/sstat.errorintPShift[-5900/6800] Peak velocity shiftkm/sspect.dopplerVelocinte_PShift[30/1000] Uncertainty in PShiftkm/sspect.dopplerVelocintCShiftCentroid velocity shiftkm/sspect.dopplerVelocinte_CShiftUncertainty in Shiftkm/sspect.dopplerVelocintsigma[1100/9500] Velocity dispersionkm/sphys.veloc.dispersioninte_sigma[20/900] Uncertainty in sigmakm/sstat.errorintSkew[-0.2/0.4] Pearson skewness coefficientstat.fit.paramfloate_Skew[0.008/0.06] Uncertainty in Skewstat.errorfloatKurt[2.1/5.5] Kurtosis coefficientstat.fit.paramfloate_Kurt[0.03/0.3] Uncertainty in Kurtstat.errorfloatFlux[45/32000] Integrated flux (broad H{beta})1e-17mW.m**-2phot.fluxinte_Flux[2/2000] Uncertainty in Integrated Flux1e-17mW.m**-2stat.error;phot.fluxintEW[8/2000] Equivalent width0.1nmspect.line.eqWidthinte_EW[1/200] Uncertainty in EW0.1nmstat.error;spect.line.eqWidthintJ/ApJS/221/7/table4Spectral measurements for [OIII]{lambda}5007ID[001224/180545] Abbreviated object SDSS identifiermeta.idintprimarysigma[100/800] Velocity dispersionkm/sphys.veloc.dispersionintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDate? UT date of the observationtime.epoch;obsnullableF5100[0.1/673] Flux density at 5100 Angstroms1e-17cW.m**-2.nm**-1phot.flux.densityfloate_F5100[0.1/0.3] Uncertainty in F51001e-17cW.m**-2.nm**-1stat.errorfloatFWHM[200/1100] FWHM Full-Width at Half-Maximum (1)km/sspect.line.widthinte_sigma[7/20000] Uncertainty in sigmakm/sstat.errorintSkew[-0.3/0.4] Pearson skewness coefficientstat.fit.paramfloate_Skew[0.01/0.2] Uncertainty in Skewstat.errorfloatKurt[2.4/9.8] Kurtosis coefficientstat.fit.paramfloate_Kurt[0.01/0.4] Uncertainty in Kurtstat.errorfloatFlux[20/10000] Integrated flux ([OIII]{lambda}5007)1e-17mW.m**-2phot.fluxinte_Flux[1/1000] Uncertainty in Flux1e-17mW.m**-2stat.error;phot.fluxintEW[3/1300] Equivalent width0.1nmspect.line.eqWidthfloate_EW[0.2/200] Uncertainty in EW0.1nmstat.error;spect.line.eqWidthfloat