J/ApJ/748/131ivo://CDS.VizieR/J/ApJ/748/131doi:10.26093/cds/vizier.17480131CDSShen Y.Menard B.2017-09-19T14:23:43Z2013-11-29T09:58:05ZCDS support team

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

cds-question@unistra.frquasarsredshiftedline-intensitiesA few percent of quasars show strong associated Mg II absorption, with velocities (v_off_) lying within a few thousand km/s from the quasar systemic redshift. These associated absorption line (AAL) systems are usually interpreted as absorbers that are either intrinsic to the quasar and its host, or arising from external galaxies clustering around the quasar. Using composite spectra of ~1800 Mg II AAL quasars selected from SDSS DR7 at 0.4<~z<~2, we show that quasars with AALs with v_off_<1500km/s have a prominent excess in [OII]{lambda}3727 emission (detected at >7{sigma}) at rest relative to the quasar host, compared to unabsorbed quasars. We interpret this [OII] excess as due to enhanced star formation in the quasar host. Our results suggest that a significant fraction of AALs with v_off_<1500km/s are physically associated with the quasar and its host. AAL quasars also have dust reddening lying between normal quasars and the so-called dust-reddened quasars. We suggest that the unique properties of AAL quasars can be explained if they are the transitional population from heavily dust-reddened quasars to normal quasars in the formation process of quasars and their hosts. This scenario predicts a larger fraction of young bulges, disturbed morphologies, and interactions of AAL quasar hosts compared to normal quasars. The intrinsic link between associated absorbers and quasar hosts opens a new window to probe massive galaxy formation and galactic-scale feedback processes, and provides a crucial test of the evolutionary picture of quasars.2012ApJ...748..131Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/748/131CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/269 : SDSS Quasar Catalog, DR9Q (Paris+, 2012)J/PASJ/65/8 : Catalog of SDSS quasar absorption redshift (Qin+, 2013)J/AJ/141/137 : Pittsburgh SDSS Mg II QSO catalog (Quider+, 2011)J/ApJ/732/110 : SDSS 2175{AA} extinction bump candidates (Jiang+, 2011)J/ApJ/714/1521 : Spectroscopy of galaxies around distant QSOs (Chen+, 2010)J/MNRAS/405/2302 : Improved redshifts for SDSS quasar spectra (Hewett+, 2010)J/ApJ/698/819 : MgII and LRGs cross-correlation analysis (Lundgren+, 2009)J/ApJ/679/239 : Associated MgII absorbers (Vanden+, 2008)J/AJ/106/848 : QSO MgII absorption line systems (Drinkwater+, 1993)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/748/131https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/748/131http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/748/131https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/748/131https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/748/131http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/748/131GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/748/131/table1 (The sample of associated absorption line systems (AALs), identified from SDSS-DR7 QSOs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/748/131/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/748/131/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/748/131/table1?GETtext/xml+votable180.050000true0.190708325.85169440.0055555555555555565/1830 6972 6/0 19 49 549 553 993 2040 2091 2206 2229 4099 4100 4102 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36793 36803 36807 36809 36832 45039 45049 45050 45053 45054 45055 49009 49015 49020 49085 49100 49106https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/748/131?format=asciiOpticaldefaultJ/ApJ/748/131/table1The sample of associated absorption line systems (AALs), identified from SDSS-DR7 QSOsMJDModified Julian Datetime.epochintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS-DR7 designation (HHMMSS.ss+DDMMSS.s; J2000)meta.id;meta.maincharPlateSDSS-DR7 Plate numbermeta.id;instr.plateintFibSDSS-DR7 Fiber numbermeta.idintz[0.3/2.3] Catalogued SDSS-DR7 redshiftsrc.redshiftfloatW2796[0.1/6.9] Restframe equivalent width of MgII(2796)0.1nmspect.line.eqWidthfloate_W2796Restframe equivalent width error of MgII(2796)0.1nmstat.errorfloatW2803[0.1/6.7] Restframe equivalent width of MgII(2803)0.1nmspect.line.eqWidthfloate_W2803Restframe equivalent width error of MgII(2803)0.1nmstat.errorfloatVoff1[-2969/2999] Absorber velocity offset based on fiducial systemic redshift (1)km/sphys.veloc;arith.diffintVoff2[-4171/4407] Absorber velocity offset based on SDSS systemic redshift (1)km/sphys.veloc;arith.diffintVoff3[-3385/4709] Absorber velocity offset based on H&W systemic redshift (1)km/sphys.veloc;arith.diffintDR7Display the SDSS-DR7 quasar catalog (Cat. VII/260) for this objectmeta.ref.urlcharSloanDisplay the SDSS online data for this quasarmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.refcharNEDSimbad column added by the CDSmeta.refchar_RAPositions from SDSS names (right ascension part)degpos.eq.ra;meta.main_DEPositions from SDSS names (declination part)degpos.eq.dec;meta.main