J/ApJ/613/129ivo://CDS.VizieR/J/ApJ/613/129doi:10.26093/cds/vizier.16130129CDSWise J.H.Eracleous M.Charlton J.C.Ganguly R.2017-09-19T14:24:04Z2005-06-17T17:15:35ZCDS support team

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

cds-question@unistra.frquasarsline-intensitiesredshiftedspectroscopyultraviolet-astronomyWe present the results of a search for variability in the equivalent widths (EWs) of narrow, associated (|{Delta}v|<=5000km/s) absorption lines found in the UV spectra of z<=1.5 quasars. The goal of this search was to use variability as a means of identifying absorption lines arising in gas that is intrinsic to the quasar central engine. We have compared archival Hubble Space Telescope (HST) Faint Object Spectrograph (FOS) spectra of quasars with recent spectra obtained as part of our own snapshot survey of the same objects with the Space Telescope Imaging Spectrograph (STIS). The intervals between observations are 4-10yr. We primarily focused on the C IV absorption lines, although we also studied other lines available in the same spectra (e.g., Ly{alpha}, N V, O VI).2004ApJ...613..129Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/613/129CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/613/129https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/613/129http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/613/129https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/613/129https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/613/129http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/613/129GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/613/129/table2 (Line Identifications and Equivalent Width Measurements)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/613/129/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/613/129/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/613/129/table2?GETtext/xml+votable180.050000true46.20775-22.1978330.0055555555555555566/5731 7426 8927 9705 10217 10472 10691 11829 17075 19315 27964 28167 36086 40809 48614https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/613/129?format=asciiUVOpticaldefaultJ/ApJ/613/129/table2Line Identifications and Equivalent Width MeasurementszRedshiftdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameQuasar namecharl(STIS)? STIS observed wavelength in Angstroms0.1nmfloatnullablel_EW(STIS)Limit flag on EW(STIS)charEW(STIS)? STIS equivalent width in Angstroms0.1nmfloatnullablee_EW(STIS)p? STIS Poisson noise uncertainty in Angstroms (1)0.1nmfloatnullablee_EW(STIS)c? STIS continuum fit uncertainty in Angstroms (1)0.1nmfloatnullablef_l(STIS)STIS blend flag (2)charl(FOS)? FOS observed wavelength in Angstroms0.1nmfloatnullablel_EW(FOS)Limit flag on EW(FOS)charEW(FOS)? FOS equivalent width in Angstroms0.1nmfloatnullablee_EW(FOS)p? FOS Poisson noise uncertainty in Angstroms (1)0.1nmfloatnullablee_EW(FOS)c? FOS continuum fit uncertainty in Angstroms (1)0.1nmfloatnullablef_l(FOS)[o] Indicates FOS values out of rangecharl_DEWLimit flag on DEWcharDEW? Difference between FOS and STIS equivalent widths in Angstroms0.1nmfloatnullablel_DEW/sigLimit flag on DEW/sigcharDEW/sig? Deviation normalized to error (3)floatnullablef_DEW/sig[u] Indicates a variable absorption linecharLineLine identificationcharf_LineFlag on Line (4)charWave? Adopted rest wavelength in Angstroms0.1nmfloatnullablef_Wave[ae] Flag on Wave (5)charDlambda? Difference between observed and expected wavelength in Angstroms0.1nmfloatnullablezAbs? Redshift of the absorption-line systemdoublenullableDVel? Velocity offset of an absorption line (6)km/sintnullablef_DVel[u] Indicates variable absorption for DVelcharSimbadSimbad column added by the CDScharNEDSimbad column added by the CDSchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main