J/MNRAS/468/L6ivo://CDS.VizieR/J/MNRAS/468/L6doi:10.26093/cds/vizier.74689006CDSLu W.-J.Lin Y.-R.Qin Y.-P.Huang W.-R.Pan C.-J.Huang H.-Y.,Yao M.Nong W.-J.Yao Z.-K.Lu M.-M.Pan D.-S.Huang H.-Q.Han Q.-L.2024-08-17T20:19:00Z2020-04-21T14:53:37ZCDS support team

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

cds-question@unistra.frquasarsredshiftedline-intensitiesIn this Letter, we report the discovery of a strong correlation between the variability of narrow absorption lines (NALs) and the ionizing continuum from a two-epoch spectral sample of 40 quasars containing 52 variable CIV {lambda}{lambda}1548, 1551 absorption doublets. According to the concordance index, this sample is classified into two subsamples. Subsample I shows an anti-correlation between the variations of absorption lines and the continuum, while Subsample II exhibits a positive correlation. These results imply that these variable CIV {lambda}{lambda}1548, 1551 absorption doublets are intrinsic to the corresponding quasars and that their variations are caused primarily by the fluctuations of the ionizing continuum. Based on our analysis, we propose that there might be two kinds of absorption gas: one that is very sensitive to the continuum variations, and another that is not. In addition, we suggest that in many cases the emergence or disappearance of NALs is caused by fluctuations of the ionizing continuum.2017MNRAS.468L...6Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/468/L6CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/405/2302 : Improved redshifts for SDSS quasar spectra (Hewett+, 2010)J/MNRAS/450/3904 : Quasars narrow absorption lines from SDSS (Chen+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/468/L6https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/468/L6http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/468/L6https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/468/L6https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/468/L6http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/468/L6GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/468/L6/table1 (CIV absorption systems and the continuum data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/468/L6/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/468/L6/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/468/L6/table1?GETtext/xml+votable180.050000true12.9885450.06521810.0055555555555555566/4625 4646 4667 4813 5337 5363 5434 5504 6198 6213 6599 6916 8192 9374 9394 9406 9410-9411 10765 17754 17821 17840 18025 18834 19025 19094 19099 26023 26093 26199 26257 26331 27045 27058 27260 27303 27333 27658 27666 31531https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/468/L6?format=asciidefaultJ/MNRAS/468/L6/table1CIV absorption systems and the continuum datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS identifier, HHMMSS.ss+DDMMSS.smeta.id.partcharzemRedshift derived from emission lines (1)src.redshiftfloatzabsRedshift derived from absorption lines (2)src.redshiftfloatFcont1Flux of the pseudo-continuum for the earlier epoch (3)1e-19W.m**-2.nm**-1phot.fluxfloate_Fcont1Error of Fcont11e-19W.m**-2.nm**-1stat.errorfloatFcont2Flux of the pseudo-continuum for the later epoch (3)1e-19W.m**-2.nm**-1phot.fluxfloate_Fcont2Error of Fcont21e-19W.m**-2.nm**-1stat.errorfloatDFcontFlux variability amplitudesrc.var.amplitudefloate_DFcontError of flux variability amplitudestat.errorfloatDEW48Equivalent widths variability amplitude of C IV {lambda}1548src.var.amplitudee_DEW48Error of equivalent widths variability amplitudestat.errorfloatDEW51Equivalent widths variability amplitude of C IV {lambda}1551src.var.amplitudee_DEW51Error of equivalent widths variability amplitudestat.errorfloatIndex[-1/1]? The concordance index (4)meta.codeintnullableNoteChange of the absorption line (2)meta.notecharSloanDisplay the online SDSS data for the nearest objectmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar_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