J/MNRAS/438/2317ivo://CDS.VizieR/J/MNRAS/438/2317doi:10.26093/cds/vizier.74382317CDSHill A.R.Gallagher S.C.Deo R.P.Peeters E.Richards G.T.2024-08-08T20:12:21Z2015-02-19T15:02:58ZCDS support team

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

cds-question@unistra.frquasarsinfrared-astronomyspectroscopyMid-infrared (MIR) quasar spectra exhibit a suite of emission features including high ionization coronal lines from the narrow-line region illuminated by the ionizing continuum, broad dust bumps from silicates and graphites, and polycyclic aromatic hydrocarbon (PAH) features from star formation in the host galaxy. However, in Spitzer Infared Spectrograph (IRS) data, few features are detected in most individual spectra because of typically low signal-to-noise ratios (S/N). By generating spectral composites from over 180 IRS observations of Sloan Digital Sky Survey broad-line quasars, we boost the S/N and reveal features in the complex spectra that are otherwise lost in the noise. In addition to an overall composite, we generate composites in three different luminosity bins that span the range of 5.6{mu}m luminosities of 10^40^-10^46^ (erg/s). We detect the high-ionization, forbidden emission lines of [SIV], [OIV] and [NeV] {lambda}14um in all templates and PAH features in all but the most luminous template.2014MNRAS.438.2317Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/438/2317CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/438/2317https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/438/2317http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/438/2317https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/438/2317https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/438/2317http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/438/2317GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/438/2317/table1 (*All objects used in generating the mid-IR and optical composites)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/438/2317/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/438/2317/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/438/2317/table1?GETtext/xml+votable180.050000true168.477763912.744180.0055555555555555566/4215 4285 4540 4545 4649 4787 4834 4990 4992 5016 5049 5284 5367 5500 5576 5597 5687 5712 5817 5839 5865 6028 6047 6070 6076 6093 6112 6252 6391 6446 6462 6532 6593 6625 7184 7212 7246 7254 7277 7298 7321 7361 7364 7386 7425 7466 7484-7486 7522 8216 8225 8268 8547 8590 8597 8636 8881 8893 8922 9018-9019 9146 9246 9262 9445 9471 9512 9608 9639-9640 9750 9796-9797 9816 9820 9852 9959 10085 10146-10147 10182 10190-10191 10217 10219 10288 10394 10432 10454 10512 10578 10637 10694 10706 10709 10716 11029 11132 11380-11381 11388 11406 11416 11481 11491 11504 11585 11875 17506 17727 17812 17814 18010 18065 18367 18519 18769 18864 19688 19738 19741 19762 21847 21873 23194 23210-23211 25919 25972 25982 26041 26070 26096 26167 26173 26178 26183 26198 26228 26230 26260 26300 26310 26393 26509 26547 26942 26973 27005 27023 27225 27227 27293 27343 27349 27446 27590 27699 27721 27857 27955 28060 28172 28188 28249 28254 28471 28535 28609 30040 31401 31650 36764https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/438/2317?format=asciiInfrareddefaultJ/MNRAS/438/2317/table1*All objects used in generating the mid-IR and optical compositesNmeta.ref.urlintnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPlatePlate SDSS identifier (1)meta.id;instr.plateintFiberFiber SDSS identifier (1)meta.id;meta.mainintMJDMJD SDSS identifier (1)time.epochintAORKEYAORKEY Spitzer IRS identifiermeta.idintlogL5.6[39.7/46.1] 5.6{mu}m luminosity (log(erg/s))log(1e-07W)phys.luminosity;em.IR.4-8umfloatiMAGAbsolute i-band magnitudemagphys.magAbsfloatTemp[1/3] Template number (2)src.classint_RAPosition from SDSS spectroscopic name (right ascension part)degpos.eq.ra;meta.main_DEPosition from SDSS spectroscopic name (declination part)degpos.eq.dec;meta.mainProgIDProgram ID Spitzer IRS identifiermeta.id;obsintzRedshift from Hewett & Wild (2010MNRAS.405.2302H, Cat. J/MNRAS/405/2302)src.redshiftfloatJ/MNRAS/438/2317/table2Values for the templates generated from the objects listed in Table 1recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[1.69/34.70] Wavelengthumem.wlfloatLnuTotal template spectral luminosity (spectral average of all objects) (1)phys.luminosityfloatLnu1? Spectral luminosity of most luminous QSOs (1)phys.luminosityfloatnullableLnu2? Spectral luminosity of intermediate QSOs (1)phys.luminosityfloatnullableLnu3? Spectral luminosity of least luminous QSOs (1)phys.luminosityfloatnullable