J/MNRAS/448/3354ivo://CDS.VizieR/J/MNRAS/448/3354doi:10.26093/cds/vizier.74483354CDSTammour A.Gallagher S.C.Richards G.2024-08-14T20:20:28Z2015-03-17T08:07:41ZCDS support team

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

cds-question@unistra.frquasarsspectroscopyIn a single optical spectrum, the quasar narrow-line region (NLR) reveals low density, photoionized gas in the host galaxy interstellar medium, while the immediate vicinity of the central engine generates the accretion disk continuum and broad emission lines. To isolate these two components, we construct a library of high S/N optical composite spectra created from the Sloan Digital Sky Survey (SDSS-DR7). We divide the sample into bins of continuum luminosity and H{beta} FWHM that are used to construct median composites at different redshift steps up to 0.75. We measure the luminosities of the narrow-emission lines [NeV]{lambda}3427, [NeIII]{lambda}3870, [OIII]{lambda}5007, and [OII]{lambda}3728 with ionization potentials (IPs) of 97, 40, 35, and 13.6eV respectively. The high IP lines' luminosities show no evidence of increase with redshift consistent with no evolution in the AGN SED or the host galaxy ISM illuminated by the continuum. In contrast, we find that the [OII] line becomes stronger at higher redshifts, and we interpret this as a consequence of enhanced star formation contributing to the [OII] emission in host galaxies at higher redshifts. The SFRs estimated from the [OII] luminosities show a flatter increase with z than non-AGN galaxies given our assumed AGN contribution to the [OII] luminosity. Finally, we confirm an inverse correlation between the strength of the FeII{lambda}4570 complex and both the [OIII] EW (though not the luminosity) and the width of the H{beta} line as known from the eigenvector 1 correlations.2015MNRAS.448.3354Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/448/3354CatalogResearchIsServedByTAP VizieR generic servicerelated-toVII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/448/3354https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/448/3354http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/448/3354https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/448/3354https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/448/3354http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/448/3354GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapAssociated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/MNRAS/448/3354defaultJ/MNRAS/448/3354/table3Measured line luminosities for the four forbidden lines [OII], [OIII], [NeIII], and [NeV]recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFileNameName of the composite spectrum (1)meta.id;meta.maincharzCentre of the redshift binsrc.redshiftfloatLNeV? Line luminosity of the [Ne V] line1e+33Wphys.luminosityfloatnullablee_LNeV? rms uncertainty on LNeV1e+33Wstat.errorfloatnullableLNeIII? Line luminosity of the [Ne III] line1e+33Wphys.luminosityfloatnullablee_LNeIII? rms uncertainty on LNeIII1e+33Wstat.errorfloatnullableLOII? Line luminosity of the [OII] line1e+33Wphys.luminosityfloatnullablee_LOII? rms uncertainty on LOII1e+33Wstat.errorfloatnullableLOIII? Line luminosity of the [OIII] line1e+33Wphys.luminosityfloatnullablee_LOIII? rms uncertainty on LOIII1e+33Wstat.errorfloatnullablesp[*] * indicates spectrum file in sp sudirectorymeta.notecharJ/MNRAS/448/3354/listList of FITS average spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCre.DateCreation datetime.creationnullablelam.min[2300] Lower value of wavelength interval0.1nminstr.bandwidthintlam.max[7000] Upper value of wavelength interval0.1nminstr.bandwidthintdlam[1] Spectral resolution0.1nmspect.resolutionintspShow the spectrummeta.ref.urlcharsize[39/45] Size of FITS fileKibytephys.size;meta.fitsintfitsDownload the FITS filemeta.ref.urlcharHb.min[0/4] Lower range of H{beta} FWHM binMm/sphys.velocintHb.max[2/20] Upper range of H{beta} FWHM binMm/sphys.velocintLo.min[43.15/44.63] Lower range of log(L_5100_) luminosity bin [log(erg/s)]log(1e-07W)phys.luminosity;em.optfloatLo.max[44.17/44.72] Upper range of log(L_5100_ ) luminosity bin [log(erg/s)]log(1e-07W)phys.luminosity;em.optfloatz.min[0/0.75] Lower range of redshift binsrc.redshift;pos.heliocentricfloatz.max[0.15/0.75] Upper range of redshift binsrc.redshift;pos.heliocentricfloatFileNameName of the FITS spectrum in subdirectory spmeta.id;meta.fitscharTitleTitle of the filemeta.title;meta.filecharAssocDataAssociated Data web pagemeta.ref.urlchar