J/MNRAS/462/3285ivo://CDS.VizieR/J/MNRAS/462/3285doi:10.26093/cds/vizier.74623285CDSPerrotta S.D'odorico V.Prochaska J.X.Cristiani S.Cupani G.,Ellison S.Lopez S.Becker G.D.Berg T.A.M.Christensen L.,Denney K.D.Hamann F.Paris I.Vestergaard M.Worseck G.2024-08-16T20:18:35Z2018-05-15T08:17:14ZCDS support team

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

cds-question@unistra.frsurveysquasarsspectroscopyredshiftedWe statistically study the physical properties of a sample of narrow absorption line (NAL) systems looking for empirical evidences to distinguish between intrinsic and intervening NALs without taking into account any a priori definition or velocity cut-off. We analyse the spectra of 100 quasars with 3.5<z_em_<4.5, observed with X-shooter/Very Large Telescope in the context of the XQ-100 Legacy Survey. We detect an ~8{sigma} excess in the CIV number density within 10000km/s of the quasar emission redshift with respect to the random occurrence of NALs. This excess does not show a dependence on the quasar bolometric luminosity and it is not due to the redshift evolution of NALs. It extends far beyond the standard 5000km/s cut-off traditionally defined for associated absorption lines. We propose to modify this definition, extending the threshold to 10000km/s when weak absorbers (equivalent width <0.2{AA}) are also considered. We infer NV is the ion that better traces the effects of the quasar ionization field, offering the best statistical tool to identify intrinsic systems. Following this criterion, we estimate that the fraction of quasars in our sample hosting an intrinsic NAL system is 33 per cent. Lastly, we compare the properties of the material along the quasar line of sight, derived from our sample, with results based on close quasar pairs investigating the transverse direction. We find a deficiency of cool gas (traced by C II) along the line of sight connected to the quasar host galaxy, in contrast with what is observed in the transverse direction.2016MNRAS.462.3285Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/462/3285CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/462/3285https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/462/3285http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/462/3285https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/462/3285https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/462/3285http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/462/3285GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/462/3285/sources (XQ-100 targets)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/462/3285/sources?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/462/3285/sources?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/462/3285/sources?GETtext/xml+votable180.050000true0.8449583-26.05538890.0055555555555555566/514 592 4169 4177 4233 4263 4267 4369 4648 4761 5124 6219 8215 8218 8277 8344-8345 8627 8765 16417 16589 16656 16666 16894 17679 17735 17751 17818 18007 18200 18209 18381 18414 18466 18499 18642 19490 19759 21885 25597 25827 25863 26037 26167 26233 26369 26375 26492 26520 26560 26596 26846 26882 26976 27057 27062 27083 27232 27286 27436 27445 27484 27498 27511 27524 27542 27588 27646 27790 27846 27917 28171 28173 28312 28332 30836 31313 31659 31706 32466 33746 34262 34271 34375 34809 34850 35002 35241 35759 35764 35770 36217 36271 36466 36834 37533 43983 45460https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/462/3285?format=asciidefaultJ/MNRAS/462/3285/sourcesXQ-100 targetsONameOther namemeta.idcharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainSimbadNameSimbad column added by the CDSmeta.idcharNameName of the targetmeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJ/MNRAS/462/3285/table2Data for the XQ-100 targetsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the targetmeta.id;meta.maincharzemEmission redshift of the targetsrc.redshiftfloatLbolBolometric luminosity of the target1e-07Wphys.luminosityfloate_LbolBolometric luminosity error1e-07Wstat.errorfloatRTypeRadio type (1)meta.notecharzabsRedshift of the absorbers (NAL)src.redshiftfloatlogNCIVCIV 1548 column densitylog(cm**-2)phys.columnDensityfloate_logNCIVCIV 1548 column density errorlog(cm**-2)stat.errorfloatEWCIVCIV 1548 rest-frame equivalent width0.1nmspect.line.eqWidthfloate_EWCIVCIV 1548 rest-frame equivalent width error0.1nmstat.errorfloatlogNSiIV? SiIV 1393 column densitylog(cm**-2)phys.columnDensityfloatnullablee_logNSiIV? SiIV 1393 column density errorlog(cm**-2)stat.errorfloatnullableEWSiIV? SiIV 1393 rest-frame equivalent width0.1nmspect.line.eqWidthfloatnullablee_EWSiIV? SiIV 1393 rest-frame equivalent width error0.1nmstat.errorfloatnullablelogNNV? NV 1238 column densitylog(cm**-2)phys.columnDensityfloatnullablee_logNNV? NV 1238 column density errorlog(cm**-2)stat.errorfloatnullableEWNV? NV 1238 rest-frame equivalent width0.1nmspect.line.eqWidthfloatnullablee_EWNV? NV 1238 rest-frame equivalent width error0.1nmstat.errorfloatnullablelogNCII? CII 1334 column densitylog(cm**-2)phys.columnDensityfloatnullablee_logNCII? CII 1334 column density errorlog(cm**-2)stat.errorfloatnullableEWCII? CII 1334 rest-frame equivalent width0.1nmspect.line.eqWidthfloatnullablee_EWCII? CII 1334 rest-frame equivalent width error0.1nmstat.errorfloatnullable