Improved redshifts for SDSS quasar spectra J/MNRAS/405/2302 ivo://CDS.VizieR/J/MNRAS/405/2302 doi:10.26093/cds/vizier.74052302 CDS Hewett P.C. Wild V. 2024-07-11T20:16:51Z 2011-01-14T09:47:40Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr surveys quasars redshifted A systematic investigation of the relationship between different redshift estimation schemes for more than 91000 quasars in the Sloan Digital Sky Survey (SDSS) Data Release 6 is presented. The publicly available SDSS quasar redshifts are shown to possess systematic biases of {Delta}z/(1+z)>=0.002 (600km/s) over both small ({delta}z~=0.1) and large ({delta}z~=1) redshift intervals. Empirical relationships between redshifts based on (i) CaII H&K host galaxy absorption, (ii) quasar [OII] {lambda}{lambda}3728, (iii) [OIII] {lambda}{lambda} 4960, 5008 emission and (iv) cross-correlation (with a master-quasar template) that includes, at increasing quasar redshift, the prominent MgII {lambda}{lambda} 2799, CIII] {lambda}{lambda} 1908 and CIV {lambda}{lambda} 1549 emission lines are established as a function of quasar redshift and luminosity. New redshifts in the resulting catalogue possess systematic biases, a factor of ~=20 lower compared to the SDSS redshift values; systematic effects are reduced to the level of {Delta}z/(1+z) (30km/s) per unit redshift or <=2.5x10^-5^ per unit absolute magnitude. Redshift errors, including components due both to internal reproducibility and to the intrinsic quasar-to-quasar variation among the population, are available for all quasars in the catalogue. The improved redshifts and their associated errors have wide applicability in areas such as quasar absorption outflows, quasar clustering, quasar-galaxy clustering and proximity-effect determinations. 2010MNRAS.405.2302H https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/405/2302 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010) http://www.sdss.org : Home Page https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/405/2302 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/405/2302 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/405/2302 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/405/2302 https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/405/2302 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/405/2302 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/MNRAS/405/2302/table4 (Quasar redshift catalogue) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/405/2302/table4? https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/405/2302/table4? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/405/2302/table4? 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36721-36723 36759 36761-36763 36792-36794 36796 36812 36816-36818 36832 36861-36863 40959 45023 45039 45043 48983 48987 49005 49007 49020-49022 49077-49079 49091 49108 49112 49124 49126 49128-49130 49149-49151 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/405/2302?format=ascii Optical default J/MNRAS/405/2302/table4 Quasar redshift catalogue z Redshift src.redshift float recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int SDSS SDSS object name (JHHMMSS.ss+DDMMSS.s) meta.id;meta.main char e_z Redshift error stat.error;src.redshift float Det [-1/1] FIRST Detection status: 1=detected, -1=not detected, 0=outside FIRST footprint meta.code int z1 ? Alternate redshift for objects with Det=0 and cross-correlation redshift estimate >1.1 src.redshift float nullable n_z [1/7] Redshift estimation method code (2) meta.note int Plate SDSS spectroscopic plate pos.parallax.spect;instr.plate int MJD SDSS MJD of spectroscopic observation d time.epoch;obs int Fiber SDSS spectroscopic fibre number meta.number;pos.parallax.spect int Sloan Display the SDSS data for this quasar meta.ref.url char DR7 Display the details of the SDSS-DR7 photometry for this source meta.ref.url char RAJ2000 Right ascension (J2000) deg pos.eq.ra;meta.main indexed DEJ2000 Declination (J2000) deg pos.eq.dec;meta.main indexed
J/MNRAS/405/2302/table5 Quasar cross-correlation templates recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int lambda Wavelength (Angstroms) 0.1nm em.wl float rFlux1 Relative flux (per unit wavelength) for the master quasar cross-correlation template (1) stat.correlation float Nqso1 Number of quasars contributing at given wavelength meta.number int rFlux2 ? Relative flux (per unit wavelength) for the FIRST-detected quasar cross-correlation template (1) stat.correlation double nullable Nqso2 Number of quasars contributing at given wavelength meta.number int