J/MNRAS/399/2231ivo://CDS.VizieR/J/MNRAS/399/2231doi:10.26093/cds/vizier.73992231CDSScaringi S.Cottis C.Knigge C.Goad M.2024-07-09T20:15:56Z2009-12-31T22:30:38ZCDS support team

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

cds-question@unistra.frsurveysquasarsredshiftedWe apply a recently developed method for classifying broad absorption line quasars (BALQSOs) to the latest QSO catalogue constructed from Data Release 5 of the Sloan Digital Sky Survey. Our new hybrid classification method combines the power of simple metrics, supervised neural networks and visual inspection. The resulting BALQSO catalogue is both more complete and more robust than all previous BALQSO catalogues, containing 3552 sources selected from a parent sample of 28421 QSOs in the redshift range 1.7<z<4.2. This equates to a raw BAL QSO fraction of 12.5%. In the process of constructing a robust catalogue we shed light on the main problems encountered when dealing with BALQSO classification, in particular when the astronomical objects in question do not yet have a formal definition as is the case for BALQSOs. This introduces some subjectivity on what is meant by BALQSO, and because of this we also provide meta-data of our catalogue, comprising our whole parent sample which can be used to quickly isolate and explore various sub-samples.2009MNRAS.399.2231Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/399/2231CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/252 : SDSS-DR5 quasar catalog (Schneider+, 2007)J/AJ/133/313 : AGN from RASS and SDSS DR5 (Anderson+, 2007)J/ApJ/685/773 : X-Ray-UV relations in SDSS DR5 QSOs (Gibson+, 2008)http://www.sdss.org : SDSS Home Pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/399/2231https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/399/2231http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/399/2231https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/399/2231https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/399/2231http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/399/2231GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/399/2231/catalog (DR5 meta-catalogue (1.7<z<4.2))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/399/2231/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/399/2231/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/399/2231/catalog?GETtext/xml+votable180.050000true0.02722810.51534890.0055555555555555563/75 79 83 94-95 113 116 4/256-258 260-262 264 296 299 307-309 311 313-314 341 343-344 347 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49149-49151https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/399/2231?format=asciiOpticaldefaultJ/MNRAS/399/2231/catalogDR5 meta-catalogue (1.7<z<4.2)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS DR5 Designation HHMMSS.ss+DDMMSS.s (J2000)meta.id;meta.maincharzRedshiftsrc.redshiftfloatiMAGAbsolute i magnitudemagphys.magAbsfloatlz[0/1] Low-z Quasar (color selection only) target flag (1)meta.codeinthz[0/1] High-z Quasar (color selection only) target flag (1)meta.codeintBIBalnicity Index taken from Gibson et al., 2008, Cat. <J/ApJ/685/773> (2)km/smeta.code;spect.indexintLVQ[0/1] BALQSO tag from "Learning Vector Quantization" network (Kohonen) (1)meta.codeintBAL[0/1] Final BALQSO tag using hybrid-LVQ method (1)meta.codeintSloanDisplay the SDSS data for this quasarmeta.ref.urlcharDR5Display the details from the SDSS-DR5 catalog (II/276)meta.ref.urlcharRAJ2000Right Ascenscion in decimal degrees, J2000degpos.eq.ra;meta.mainindexedDEJ2000Declination in decimal degrees, J2000degpos.eq.dec;meta.mainindexed