Variable MgII NALs in SDSS DR14 J/ApJS/250/3 ivo://CDS.VizieR/J/ApJS/250/3 doi:10.26093/cds/vizier.22500003 CDS Chen Z.-F. Qin H.-C. Gui R.-J. Yi S.-X. Chen Z.-G. Gao Y.-C.,Pang T.-T. Mo X.-H. 2021-04-27T12:02:07Z 2021-02-24T15:03:08Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr quasars visible-astronomy spectroscopy redshifted line-intensities Compared to high ionization CIV absorption lines, variable MgII absorption lines are rare. Using spectra from the Sloan Digital Sky Survey, we investigate the variations in MgII narrow absorption lines (NALs) for quasars with multi-epoch observations. We have compiled 8958 MgII NALs in the spectral regions from the red wings of CIV emission lines to the red wings of MgII emission lines. Among these 8958 MgII NALs, 22 variable NALs are detected with |{Delta}W_r_^{lambda}2796^|>=3{sigma}_W_ and with velocity offsets ranging from {upsilon}_r_=522 to 145513km/s. We find that: (1) the detected frequency of MgII NALs with {upsilon}_r_<=10000km/s is significantly larger than the uniformly random value expected for the MgII NALs with {upsilon}_r_>10000km/s, (2) the incidence rates of the variable MgII NALs with {upsilon}_r_<=10000km/s are much larger than those with {upsilon}_r_>10000km/s, (3) the velocity offsets of variable MgII NALs with {upsilon}_r_<=10000km/s are much smaller than the maximum velocities expected from radiation-driven outflows, and (4) the variations of variable MgII NALs with {upsilon}_r_<=10000km/s are obviously correlated with the changes in the quasar radiative output. Therefore, the 16 variable MgII NALs, whose velocities are smaller than the maximum velocities expected from radiation-driven outflows, are likely related to quasar outflows, while the 6 variable MgII NALs, whose velocities are much larger than the maximum velocities expected from radiation-driven outflows, possibly originated in intervening gas. We also find that both the variations and fractional variations in absorption strengths are not related to the velocity offsets of MgII NALs and the time intervals between the two epochs of observations. Also, the fractional variations in absorption strengths are inversely correlated with absorption strengths. In addition, both the associated and intervening MgII NALs can significantly vary on a timescale of days. 2020ApJS..250....3C https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/250/3 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to VII/269 : SDSS Quasar Catalog, DR9Q (Paris+, 2012) V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015) VII/286 : SDSS quasar catalog, fourteenth data release (Paris+, 2018) J/AJ/106/848 : QSO MgII absorption line systems (Drinkwater+, 1993) J/A+AS/108/287 : Atomic data (Verner+, 1994) J/MNRAS/354/L25 : MgII absorbers in SDSS QSOs (Bouche+, 2004) J/ApJ/613/129 : Equivalent widths of QSOs (Wise+, 2004) J/ApJ/633/638 : Variable quasar sample from SDSS (Wilhite+, 2005) J/ApJ/665/990 : SDSS DR2 BAL QSOs (Ganguly+, 2007) J/ApJS/171/1 : Census of QSOs Narrow Absorption Lines (Misawa+, 2007) J/ApJ/679/239 : Associated MgII absorbers (Vanden+, 2008) J/ApJ/714/1521 : Spectroscopy of galaxies around distant QSOs (Chen+, 2010) J/AJ/141/137 : Pittsburgh SDSS Mg II QSO catalog (Quider+, 2011) J/A+A/546/A67 : Catalog of strong MgII absorbers (Lawther+, 2012) J/A+A/548/A66 : SDSS Quasar Catalog, DR9Q (Paris+, 2012) J/ApJ/748/131 : MgII absorbers in SDSS-DR7 quasar catalog (Shen+, 2012) J/ApJ/777/168 : CIV & SiIV BAL troughs in SDSS (Filiz+, 2013) J/ApJ/779/161 : MgII absorbers in 0.4<z<2.3 SDSS QSOs (Seyffert+, 2013) J/MNRAS/434/163 : QSOs narrow absorption line variability (Hacker+, 2013) J/MNRAS/450/3904 : Quasars narrow absorption lines from SDSS (Chen+, 2015) J/ApJ/814/150 : Variability of SDSS broad absorption line QSOs (Wang+, 2015) J/ApJS/221/32 : Narrow MgII absorption lines from SDSS-DR9Q (Chen+, 2015) J/ApJS/235/11 : Absorption features in SDSS. I. MgII doublets (Chen+, 2018) J/ApJS/236/39 : CIV narrow absorption line syst. in SDSS-DR14 (Chen+, 2018) J/ApJS/239/23 : CIV NAL systems from SDSS-DR14 quasar spectra (Chen+, 2018) J/ApJ/862/22 : CIV BAL SDSS QSO obs. with Gemini (Rogerson+, 2018) J/ApJS/242/28 : MgII-BAL quasar variability in SDSS spectra (Yi+, 2019) J/ApJS/243/2 : SiIV & NV absorption line SDSS quasar systems (Chen+, 2019) http://data.sdss.org/sas/dr14/ : SDSS DR14 data https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/250/3 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/250/3 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/250/3 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/250/3 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/250/3 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/250/3 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJS/250/3/table1 (Catalog of Mg II absorption line systems) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/250/3/table1? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/250/3/table1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/250/3/table1? 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28573 28575 28578 28580 28586 28587 28588 28590 28594 28600 28601 28604 28606 28607 28609 28610 28612 28614 28619 28621 28622 28623 28630 28631 28632 28634 28635 28636 28637 28639 28640 28643 28645 28646 28660 28662 28664 28668 28671 31357 31374 31386 31388 31394 31398 31406 31409 31412 31418 31419 31420 31427 31430 31435 31439 31445 31446 31452 31454 31459 31463 31470 31471 31473 31485 31547 31550 31599 31616 31620 31622 31624 31628 31630 31631 31633 31634 31635 31636 31640 31641 31642 31646 31649 31653 31654 31656 31660 31662 31664 31665 31667 31668 31674 31684 31687 31688 31692 31694 31698 31704 31706 31707 31713 31714 31717 31735 31740 32399 32409 32410 32415 32421 32427 32434 32443 32445 32480 32481 32486 32489 32491 32497 32502 32510 32511 32680 32682 32686 36765 36766 36767 36788 36793 36795 36802 36803 36806 36812 36814 36832 36839 36846 36847 36859 36863 45049 45054 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/250/3?format=ascii Optical default J/ApJS/250/3/table1 Catalog of Mg II absorption line systems recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Seq [1/11373] Identification number of NAL pair meta.id.parent int SDSSo Quasar SDSS DR14Q identifier (position based names as in VII/286, sometimes incorrect) meta.id;meta.main char Plate [266/10000] SDSS plate number meta.id;instr.plate int MJD [51613/57520] SDSS Modified Julian Date of the observation d time.epoch int indexed Fiber [1/1000] SDSS fiber identifier meta.id int zem [0.54/2.34] Redshift from emission lines src.redshift float zabs [0.33/2.33] Redshift of MgII NAL src.redshift float EW2796 [0.07/8.7] Rest frame MgII 2796{AA} equivalent width; in Angstrom units 0.1nm spect.line.eqWidth float e_EW2796 [0.02/13.6] Uncertainty in EW2796 0.1nm stat.error float EW2803 [0.03/7.4] Rest frame MgII 2803{AA} equivalent width; in Angstrom units 0.1nm spect.line.eqWidth float e_EW2803 [0.02/17] Uncertainty in EW2803 0.1nm stat.error float F3000 [0.2/241.4]? Continuum flux at rest frame 3000{AA} (1) 1e-17cW.m**-2.nm**-1 phot.flux.density;spect.continuum float nullable e_F3000 [0.09/5.4]? Uncertainty in F3000 (1) 1e-17cW.m**-2.nm**-1 stat.error float nullable Vr [-5947/151956] Offset velocity of MgII NAL relative to quasar redshift km/s phys.veloc;arith.diff int ID [1/8958] Identification number of Mg II NAL meta.id int f_EW2796 [-2/1]? Flag on EW2796 (2) meta.code int nullable SL [0/9.9]? Significance level of the variation (3) stat.fit.goodness float nullable Sp Interactive spectrum from SDSS-DR14 meta.ref.url char SimbadName Simbad column added by the CDS meta.id char NED NED column added by the CDS meta.ref.url char _RA Right Ascension (J2000) from SIMBAD (not part of the original data) deg pos.eq.ra;meta.main indexed _DE Declination (J2000) from SIMBAD (not part of the original data) deg pos.eq.dec;meta.main indexed