J/ApJ/882/4ivo://CDS.VizieR/J/ApJ/882/4doi:10.26093/cds/vizier.18820004CDSWang S.Shen Y.Jiang L.Horne K.Brandt W.N.Grier C.J.Ho L.C.,Homayouni Y.Li J.I.-H.Schneider D.P.Trump J.R.2021-04-28T12:34:32Z2021-02-24T07:29:57ZCDS support team

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

cds-question@unistra.frquasarsspectroscopygalaxy-kinematicsredshiftedvisible-astronomysurveysThe width of the broad emission lines in quasars is commonly characterized by either the FWHM or the square root of the second moment of the line profile ({sigma}line) and used as an indicator of the virial velocity of the broad-line region (BLR) in the estimation of black hole (BH) mass. We measure FWHM and {sigma}line for H{alpha}, H{beta}, and MgII broad lines in both the mean and rms spectra of a large sample of quasars from the Sloan Digital Sky Survey Reverberation Mapping project. We introduce a new quantitative recipe to measure {sigma}line that is reproducible, is less susceptible to noise and blending in the wings, and scales with the intrinsic width of the line. We compare the four definitions of line width (FWHM and {sigma}line in mean and rms spectra, respectively) for each of the three broad lines and among different lines. There are strong correlations among different width definitions for each line, providing justification for using the line width measured in single-epoch spectroscopy as a virial velocity indicator. There are also strong correlations among different lines, suggesting that alternative lines to H{beta} can be used to estimate virial BH masses. We further investigate the correlations between virial BH masses using different line width definitions and the stellar velocity dispersion of the host galaxies and the dependence of line shape (characterized by the ratio FWHM/{sigma}line) on physical properties of the quasar. Our results provide further evidence that FWHM is more sensitive to the orientation of a flattened BLR geometry than {sigma}line, but the overall comparison between the virial BH mass and host stellar velocity dispersion does not provide conclusive evidence that one particular width definition is significantly better than the others.2019ApJ...882....4Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/882/4CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)VII/286 : SDSS quasar catalog, fourteenth data release (Paris+, 2018)J/ApJ/613/682 : AGN central masses & broad-line region sizes (Peterson+, 2004)J/ApJ/680/169 : SDSS DR5 virial black hole masses (Shen+, 2008)J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)J/ApJ/753/125 : NIR spectroscopy follow-up of 60 SDSS-DR7 QSOs (Shen+, 2012)J/ApJ/805/96 : SDSS-RM project: velocity dispersions of QSOs (Shen+, 2015)J/ApJS/217/26 : Lick AGN monitoring 2011: light curves (Barth+, 2015)J/MNRAS/454/3864 : Orientation & QSO black hole masses (Brotherton+ 2015)J/ApJS/216/4 : SDSS-RM project: technical overview (Shen+, 2015)J/ApJ/805/96 : SDSS-RM project: velocity dispersions of QSOs (Shen+, 2015)J/ApJ/818/30 : Lag measurements for 15 z<0.8 QSOs from SDSS-RM (Shen+, 2016)J/ApJ/831/7 : SDSS-RM project: peak velocities of QSOs (Shen+, 2016)J/ApJ/851/21 : SDSS RM project first year of observations (Grier+, 2017)J/ApJS/235/11 : Absorption features in SDSS. I. MgII doublets (Chen+, 2018)J/ApJS/250/10 : SDSS-RM AGNs CFHT & Bok photometry over 4yrs (Kinemuchi+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/882/4https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/882/4http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/882/4https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/882/4https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/882/4http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/882/4GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/882/4/table3 (Line width measurements)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/882/4/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/882/4/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/882/4/table3?GETtext/xml+votable180.050000true213.654341353.07299320.0055555555555555565/2856 6/10741 10743 10749 11402 11403 11406 11428 11430 11432 11433 11436https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/882/4?format=asciiOpticaldefaultJ/ApJ/882/4/table3Line width measurementsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRMID[0/848]? SDSS-RM identification numbermeta.idintnullableSDSSSDSS name (HHMMSS.ss+DDMMSS.s; J2000) (SDSS_name)meta.id;meta.maincharRAJ2000[211.2/216.2] Right ascension (J2000) (RA)degpos.eq.ra;meta.mainDEJ2000[51.6/54.6] Declination (J2000) (DEC)degpos.eq.dec;meta.mainz[0.11/4.4] Redshift (Redshift)src.redshiftdoublesigma[43/380]? Stellar velocity dispersion (SIGMA_HOST1)km/sphys.veloc.dispersiondoublenullablee_sigma[1.8/74.3]? Sigma uncertainty (SIGMA_HOST2)km/sstat.errordoublenullableFWHMHa[1035/8700]? H{alpha} FWHM in mean spectra (HALPHA_FWHM_mean1)km/sspect.line.widthfloatnullablee_FWHMHa[32/1341]? FWHMHa uncertainty (HALPHA_FWHM_mean2)km/sstat.errorfloatnullablesigHa[503/3459]? H{alpha} {sigma}_line_ in mean spectra (HALPHA_SIGMA_mean1)km/sphys.veloc.dispersiondoublenullablee_sigHa[11/563]? SigHa uncertainty (HALPHA_SIGMA_mean2)km/sstat.errordoublenullableFWHMHar[1035/9399]? H{alpha} FWHM in rms spectra (HALPHA_FWHM_rms1)km/sspect.line.widthfloatnullablee_FWHMHar[28/1922]? FWHMHar uncertainty (HALPHA_FWHM_rms2)km/sstat.errorfloatnullablesigHar[474/3942]? H{alpha} {sigma}_line_ in rms spectra (HALPHA_SIGMA_rms1)km/sphys.veloc.dispersiondoublenullablee_sigHar[1/308]? SigHar uncertainty (HALPHA_SIGMA_rms2)km/sstat.errordoublenullableFWHMHb[34/11804]? H{beta} FWHM in mean spectra (HBETA_FWHM_mean1)km/sspect.line.widthfloatnullablee_FWHMHb[29/2620]? FWHMHb uncertainty (HBETA_FWHM_mean2)km/sstat.errorfloatnullablesigHb[666/4385]? H{beta} {sigma}_line_ in mean spectra (HBETA_SIGMA_mean1)km/sphys.veloc.dispersiondoublenullablee_sigHb[9/925]? SigHb uncertainty (HBETA_SIGMA_mean2)km/sstat.errordoublenullableFWHMHbr[622/10607]? H{beta} FWHM in rms spectra (HBETA_FWHM_rms1)km/sspect.line.widthfloatnullablee_FWHMHbr[16/2623]? FWHMHbr uncertainty (HBETA_FWHM_rms2)km/sstat.errorfloatnullablesigHbr[427.3/5091]? H{beta} {sigma}_line_ in rms spectra (HBETA_SIGMA_rms1)km/sphys.veloc.dispersiondoublenullablee_sigHbr[0.09/210]? SigHbr uncertainty (HBETA_SIGMA_rms2)km/sstat.errordoublenullableFWHMMgII[482/45728]? MgII FWHM in mean spectra (MGII_FWHM_mean1)km/sspect.line.widthfloatnullablee_FWHMMgII[21/21482]? FWHMMgII uncertainty (MGII_FWHM_mean2)km/sstat.errorfloatnullablesigMgII[721/42134]? MgII {sigma}_line_ in mean spectra (MGII_SIGMA_mean1)km/sphys.veloc.dispersiondoublenullablee_sigMgII[6/2399]? SigMgII uncertainty (MGII_SIGMA_mean2)km/sstat.errordoublenullableFWHMMgIIr[68/10732]? MgII FWHM in rms spectra (MGII_FWHM_rms1)km/sspect.line.widthfloatnullablee_FWHMMgIIr[10/2883]? FWHMMgIIr uncertainty (MGII_FWHM_rms2)km/sstat.errorfloatnullablesigMgIIr[714.2/6488]? MgII {sigma}_line_ in rms spectra (MGII_SIGMA_rms1)km/sphys.veloc.dispersiondoublenullablee_sigMgIIr[0.006/1300]? SigMgIIr uncertainty (MGII_SIGMA_rms2)km/sstat.errordoublenullableFeII[-0/4.85] Optical FeII strength (relative to broad H{beta}) (R_FE)spect.line.intensity;arith.ratiofloatChi2cHa[0/32.1] Reduced {chi}^2^ of the continuum fit around H{alpha} (REDCHI2_CONTINUUMFIT1)stat.fit.chi2;spect.linefloatChi2cHb[0/35.2] Reduced {chi}^2^ of the continuum fit around H{beta} (REDCHI2_CONTINUUMFIT2)stat.fit.chi2;spect.linefloatChi2cMgII[0/77.9] Reduced {chi}^2^ of the continuum fit around MgII (REDCHI2_CONTINUUMFIT3)stat.fit.chi2;spect.linefloatChi2Ha[0/539.2] Reduced {chi}^2^ of line fit of H{alpha} (REDCHI2_LINEFIT1)stat.fit.chi2;spect.linefloatChi2Hb[0/56.7] Reduced {chi}^2^ of line fit of H{beta} (REDCHI2_LINEFIT2)stat.fit.chi2;spect.linefloatChi2MgII[0/44.9] Reduced {chi}^2^ of line fit of MgII (REDCHI2_LINEFIT3)stat.fit.chi2;spect.linefloatmHa[0/1] Is in the H{alpha} good mean subsample (1=yes) (FLAG_GOOD_MEAN_HALPHA)meta.codeintrHa[0/1] Is in the H{alpha} good rms subsample (1=yes) (FLAG_GOOD_RMS_HALPHA)meta.codeintmHb[0/1] Is in the H{beta} good mean subsample (1=yes) (FLAG_GOOD_MEAN_HBETA)meta.codeintrHb[0/1] Is in the H{beta} good rms subsample (1=yes) (FLAG_GOOD_RMS_HBETA)meta.codeintmMgII[0/1] Is in the MgII good mean subsample (1=yes) (FLAG_GOOD_MEAN_MGII)meta.codeintrMgII[0/1] Is in the MgII good rms subsample (1=yes) (FLAG_GOOD_RMS_MGII)meta.codeintSloanDisplay the online SDSS-DR14 data for the nearest objectmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlchar