Quasars narrow absorption lines from SDSS J/MNRAS/450/3904 ivo://CDS.VizieR/J/MNRAS/450/3904 doi:10.26093/cds/vizier.74503904 CDS Chen Z.-F. Gu Q.-S. Chen Y.-M. Cao Y. 2024-08-14T20:22:02Z 2017-12-18T09:25:22Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr quasars visible-astronomy sloan-photometry redshifted line-intensities We assemble 3524 quasars from the Sloan Digital Sky Survey (SDSS) with repeated observations to search for variations of the narrow C IV {lambda}{lambda}1548, 1551 and Mg II {lambda}{lambda}2796, 2803 absorption doublets in spectral regions shortward of 7000{AA} in the observed frame, which corresponds to time-scales of about 150-2643d in the quasar rest frame. In these quasar spectra, we detect 3580 CIV absorption systems with z_abs_=1.5188-3.5212 and 1809 MgII absorption systems with z_abs_=0.3948-1.7167. In term of the absorber velocity ({beta}) distribution in the quasar rest frame, we find a substantial number of CIV absorbers with {beta}<0.06, which might be connected to absorption of quasar outflows. The outflow absorption peaks at {upsilon}~2000km/s and drops rapidly below this peak value. Among 3580 CIV absorption systems, 52 systems (~1.5 percent) show obvious variations in equivalent widths in the absorber rest frame (W_r_): 16 enhanced, 16 emerged, 12 weakened and 8 disappeared systems, respectively. We find that changes in W_r_{lambda}1548 are related neither to the time-scales of the two SDSS observations nor to absorber velocities in the quasar rest frame. Variable absorption in low-ionization species is important to constrain the physical conditions of the absorbing gas. There are two variable MgII absorption systems measured from SDSS spectra detected by Hacker et al. (2013, J/MNRAS/434/163). However, in our MgII absorption sample, we find that neither shows variable absorption with confident levels of >4{sigma} for {lambda}2796 lines and >3{sigma} for {lambda}2803 lines. 2015MNRAS.450.3904C https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/450/3904 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to VII/269 : SDSS Quasar Catalog, DR9Q (Paris+, 2012) VII/279 : SDSS quasar catalog: twelfth data release (Paris+, 2017) J/ApJ/613/129 : Equivalent widths of QSOs (Wise+, 2004) J/MNRAS/405/2302 : Improved redshifts for SDSS quasar spectra (Hewett+, 2010) J/ApJS/199/3 : The quasars MMT-BOSS pilot survey (Ross+, 2012) J/MNRAS/434/163 : QSOs narrow absorption line variability (Hacker+, 2013) J/ApJS/210/7 : BOSS narrow CIV absorption lines. I. zem<=2.4 (Chen+, 2014) J/ApJS/215/12 : BOSS narrow CIV absorption lines. II. zem>2.4 (Chen+, 2014) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/450/3904 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/450/3904 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/450/3904 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/450/3904 https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/450/3904 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/450/3904 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/MNRAS/450/3904/tablea1 (Catalog of C IV {lambda}{lambda}1548, 1551 Absorption Systems) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/450/3904/tablea1? https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/450/3904/tablea1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/450/3904/tablea1? GET text/xml+votable 180.0 50000 true 0.8757681 0.1370081 0.005555555555555556 Cone search capability for table J/MNRAS/450/3904/tablea2 (Catalog of Mg II {lambda}{lambda}2796, 2803 Absorption Systems) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/450/3904/tablea2? https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/450/3904/tablea2? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/450/3904/tablea2? 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36792 36863 45046 45048-45049 45054-45055 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/450/3904?format=ascii Optical default J/MNRAS/450/3904/tablea1 Catalog of C IV {lambda}{lambda}1548, 1551 Absorption Systems SimbadName Simbad column added by the CDS meta.id char recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int SDSS SDSS identifier (HHMMSS.ss+DDMMSS.s) meta.id;meta.main char zem Redshift derived from emission lines src.redshift float zabs Redshift derived from absorption lines src.redshift float Plate-S SDSS-I/II plate identifier meta.id;instr.plate int MJD-S Modified Julian Date of the observation d time.epoch int Fiber-S SDSS-I/II fiber identifier meta.id int EW1548-S SDSS-I/II Rest equivalent width of C IV 1548{AA} (G1) 0.1nm spect.line.eqWidth float e_EW1548-S SDSS-I/II EW1548-S divided by its 1{sigma} error 0.1nm stat.error float EW1551-S SDSS-I/II Rest equivalent width of C IV 1551{AA} (G1) 0.1nm spect.line.eqWidth float e_EW1551-S SDSS-I/II EW1551-S divided by its 1{sigma} error 0.1nm stat.error float Plate-B BOSS plate identifier meta.id;instr.plate int MJD-B Modified Julian Date of the observation d time.epoch int Fiber-B BOSS fiber identifier meta.id int EW1548-B BOSS Rest equivalent width of C IV 1548{AA} (G1) 0.1nm spect.line.eqWidth float e_EW1548-B BOSS EW1548-B divided by its 1{sigma} error 0.1nm stat.error float EW1551-B BOSS Rest equivalent width of C IV 1551{AA} (G1) 0.1nm spect.line.eqWidth float e_EW1551-B BOSS EW1551-B divided by its 1{sigma} error 0.1nm stat.error float DR12 Display data from Paris et al. (2017, Cat. VII/279) meta.ref.url char _RA Explain (right ascension part) deg pos.eq.ra;meta.main _DE Explain (declination part) deg pos.eq.dec;meta.main
J/MNRAS/450/3904/tablea2 Catalog of Mg II {lambda}{lambda}2796, 2803 Absorption Systems SimbadName Simbad column added by the CDS meta.id char recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int SDSS SDSS identifier (HHMMSS.ss+DDMMSS.s) meta.id;meta.main char zem Redshift derived from emission lines src.redshift float zabs Redshift derived from absorption lines src.redshift float Plate-S SDSS-I/II plate identifier meta.id;instr.plate int MJD-S Modified Julian Date of the observation d time.epoch int Fiber-S SDSS-I/II fiber identifier meta.id int EW2796-S SDSS-I/II Rest equivalent width of Mg II 2796{AA} (G1) 0.1nm spect.line.eqWidth float e_EW2796-S SDSS-I/II EW2796-S divided by its 1{sigma} error 0.1nm stat.error float EW2803-S SDSS-I/II Rest equivalent width of Mg II 2803{AA} (G1) 0.1nm spect.line.eqWidth float e_EW2803-S SDSS-I/II EW2803-S divided by its 1{sigma} error 0.1nm stat.error float Plate-B SDSS-III plate identifier meta.id;instr.plate int MJD-B Modified Julian Date of the observation d time.epoch int Fiber-B BOSS fiber identifier meta.id int EW2796-B BOSS Rest equivalent width of Mg II 2796{AA} (G1) 0.1nm spect.line.eqWidth float e_EW2796-B BOSS EW2796-B divided by its 1{sigma} error 0.1nm stat.error float EW2803-B BOSS Rest equivalent width of Mg II 2803{AA} (G1) 0.1nm spect.line.eqWidth float e_EW2803-B BOSS EW2803-B divided by its 1{sigma} error 0.1nm stat.error float DR12 Display data from Paris et al. (2017, Cat. VII/279) meta.ref.url char _RA Explain (right ascension part) deg pos.eq.ra;meta.main _DE Explain (declination part) deg pos.eq.dec;meta.main