FeII emission in quasars J/ApJ/687/78 ivo://CDS.VizieR/J/ApJ/687/78 doi:10.26093/cds/vizier.16870078 CDS Hu C. Wang J.-M. Ho L.C. Chen Y.-M. Zhang H.-T. Bian W.-H. Xue S.-J. 2017-12-22T05:32:41Z 2010-12-09T11:11:39Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr spectroscopy redshifted quasars line-intensities Broad FeII emission is a prominent feature of the optical and ultraviolet spectra of quasars. We report on a systematical investigation of optical FeII emission in a large sample of 4037 z<0.8 quasars selected from the SDSS-DR5 quasar catalog (Cat. VII/252). We have developed and tested a detailed line-fitting technique, taking into account the complex continuum and narrow and broad emission-line spectra. Our primary goal is to quantify the velocity broadening and velocity shift of the FeII spectrum in order to constrain the location of the FeII-emitting region and its relation to the broad-line region. We find that the majority of quasars show FeII emission that is redshifted, typically by ~400km/s, but up to 2000km/s, with respect to the systemic velocity of the narrow-line region or of the conventional broad-line region as traced by the H{beta} line. Moreover, the line width of FeII is significantly narrower than that of the broad component of H{beta}. We show that the magnitude of the FeII redshift correlates inversely with the Eddington ratio, and that there is a tendency for sources with redshifted FeII emission to show red asymmetry in the H{beta} line. These characteristics strongly suggest that FeII originates from a location different from, and most likely exterior to, the region that produces most of H{beta}. The FeII-emitting zone traces a portion of the broad-line region of intermediate velocities whose dynamics may be dominated by infall. 2008ApJ...687...78H https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/687/78 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010) J/ApJ/674/668 : SDSS J102839.11+450009.4 Fe II emission lines (Wang+, 2008) J/ApJ/683/L115 : Intermediate-line region in quasars (Hu+, 2008) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/687/78 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/687/78 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/687/78 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/687/78 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/687/78 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/687/78 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJ/687/78/table2 (Spectrophotometric measurements) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/687/78/table2? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/687/78/table2? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/687/78/table2? 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Error in v(Mg) (1) km/s stat.error float nullable L(OIII) OIII{lambda}5007 luminosity 1e-07W phys.luminosity double recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int SDSS SDSS DR5 designation (HHMMSS.ss+DDMMSS.s) meta.id;meta.main char z Redshift determined using peak of [OIII]5007 src.redshift float L(Fe) Luminosity of FeII emission between 4434 & 4686 Angstroms 1e-07W phys.luminosity double e_L(Fe) Error in L(Fe) 1e-07W stat.error double W(Fe) FeII FWHM km/s spect.line.width float e_W(Fe) Error in FWHM(Fe) km/s stat.error float v(Fe) FeII velocity shift (1) km/s spect.dopplerVeloc float e_v(Fe) Error in v(Fe) (1) km/s stat.error float L(HbB) Broad H{beta} component luminosity 1e-07W phys.luminosity double e_L(HbB) Error in L(HbB) 1e-07W stat.error double e_W(HbB) Error in W(HbB) km/s stat.error float v(HbB) Broad H{beta} component velocity shift (1) km/s spect.dopplerVeloc float e_v(HbB) Error in v(HbB) (1) km/s stat.error float L5100 Specific continuum luminosity at 5100{AA} (in erg/s/{AA}) uW/nm phys.luminosity double e_L5100 Error in L5100 uW/nm stat.error double alpha Power law spectral index of continuum [F({lambda}){prop.to}{lambda}^{alpha}^) spect.index;spect.continuum float e_alpha Error in alpha stat.error;pos.eq.ra float l_L6cm Upper limit flag on L6cm meta.code.error char L6cm ? Specific luminosity at 6cm (2) 1e-07W.Hz**-1 phys.luminosity double nullable L2kev ? Specific luminosity at 2kev (3) 1e-07W.Hz**-1 phys.luminosity double nullable L(Mg) ? MgII luminosity 1e-07W phys.luminosity double nullable e_L(Mg) ? Error in L(Mg) 1e-07W stat.error double nullable W(Mg) ? MgII FWHM km/s spect.line.width float nullable e_W(Mg) ? Error in W(Mg) km/s stat.error float nullable v(Mg) ? MgII velocity shift (1) km/s spect.dopplerVeloc float nullable e_L(OIII) Error in L(OIII) 1e-07W stat.error double W(OIII) OIII{lambda}5007 FWHM km/s spect.line.width float e_W(OIII) Error in W(OIII) km/s stat.error float HbN/OIII Ratio of H{beta}_NC_ to OIII{lambda}5007 spect.line.intensity;arith.ratio double e_HbN/OIII Error in HbN/OIII stat.error double v(HbN) Hb_NC_ velocity shift (1) km/s spect.dopplerVeloc float e_v(HbN) Error in v(HbN) (1) km/s stat.error float L(OII) ? OII luminosity 1e-07W phys.luminosity double nullable e_L(OII) ? Error in L(OII) 1e-07W stat.error double nullable W(OII) ? OII FWHM km/s spect.line.width float nullable e_W(OII) ? Error in W(OII) km/s stat.error float nullable v(OII) ? OII velocity shift (1) km/s spect.dopplerVeloc float nullable e_v(OII) ? Error in v(OII) (1) km/s stat.error float nullable sigHb Square root of second moment of H{beta}_BC_ km/s stat.variance float MBH Mass of the central Black Hole solMass phys.mass double Lb/LEd Ratio of bolometric to Eddtington luminosity phys.luminosity;arith.ratio float FeII/HbB Ratio of FeII to H{beta}_BC_ spect.line.intensity;arith.ratio float DR7 Display the SDSS-DR7 quasar catalog data (Schneider et al. 2010, Cat. VII/260) meta.ref.url char Sloan Display the SDSS data for this quasar meta.ref.url char Simbad Simbad column added by the CDS char _RA Position from SDSS name (right ascension part) deg pos.eq.ra;meta.main _DE Position from SDSS name (declination part) deg pos.eq.dec;meta.main