J/ApJ/746/27ivo://CDS.VizieR/J/ApJ/746/27doi:10.26093/cds/vizier.17460027CDSKozlowski S.Kochanek C.S.Jacyszyn A.M.Udalski A.Szymanski M.K.,Poleski R.Kubiak M.Soszynski I.Pietrzynski G.Wyrzykowski L.,Ulaczyk K.Pietrukowicz P.2017-07-05T07:00:18Z2013-09-12T12:26:00ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleimagellanic-cloudsinfrared-photometryvisible-astronomyphotometryredshiftedquasarssurveysWe quadruple the number of quasars known behind the Large Magellanic Cloud (LMC) from 56 (42 in the Optical Gravitational Lensing Experiment (OGLE)-III LMC fields) to 200 by spectroscopically confirming 169 (144 new) quasars from a sample of 845 observed candidates in four ~3 deg^2^ Anglo-Australian Telescope/AAOmega fields south of the LMC center. The candidates were selected based on their Spitzer mid-infrared colors, X-ray emission, and/or optical variability properties in the database of the OGLE microlensing survey. The contaminating sources can be divided into 115 young stellar objects (YSOs), 17 planetary nebulae (PNe), 39 Be and 24 blue stars, 68 red stars, and 12 objects classed as either YSO/PN or blue star/YSO. There are also 402 targets with either featureless spectra or too low signal-to-noise ratios for source classification. Our quasar sample is 50% (30%) complete at I = 18.6 mag (19.3 mag). The newly discovered active galactic nuclei (AGNs) provide many additional reference points for proper motion studies of the LMC, and the sample includes 10 bright AGNs (I < 18 mag) that are potentially suitable for absorption line studies. Their primary use, however, is for detailed studies of quasar variability, as they all have long-term, high cadence, continuously growing light curves from the microlensing surveys of the LMC. Completing the existing Magellanic Quasars Survey fields in the LMC and Small Magellanic Cloud should yield a sample of ~700 well-monitored AGNs, and expanding it to the larger regions covered by the OGLE-IV survey should yield a sample of ~3600 AGNs.2012ApJ...746...27Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/746/27CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/A+A/549/A29 : Quasars behind the Magellanic system (Cioni+, 2013)J/ApJ/747/107 : QSO Candidates in the MACHO LMC database (Kim+, 2012)J/ApJS/194/22 : Magellanic Quasars Survey: QSOs behind SMC (Kozlowski+, 2011)J/ApJS/184/172 : High- and intermediate-mass YSOs in the LMC (Gruendl+, 2009)J/ApJ/701/508 : 5000 AGNs behind the Magellanic clouds (Kozlowski+, 2009)J/AJ/136/18 : LMC SAGE. New candidate YSOs (Whitney+, 2008)J/ApJS/172/383 : AGN candidates in the COSMOS field (Trump+, 2007)J/AcA/52/241 : QSO candidates in OGLE-II data (Eyer+, 2002)J/A+AS/143/391 : ROSAT HRI catalogue of LMC X-ray sources (Sasaki+, 2000)J/AJ/114/2353 : AGNs and QSOs behind nearby galaxies (Crampton+, 1997)J/ApJS/194/22 : MQS. I. QSOs behind SMC (Kozlowski+, 2011)J/ApJ/775/92 : MQS. III. AGN behind LMC and SMC (Kozlowski+, 2013)http://ogle.astrouw.edu.pl/ : OGLE homepagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/746/27https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/746/27http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/746/27https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/746/27https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/746/27http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/746/27GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/746/27/table5 (Parameters of the remaining 677 targeted sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/746/27/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/746/27/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/746/27/table5?GETtext/xml+votable180.050000true72.1561667-70.60527780.005555555555555556Cone search capability for table J/ApJ/746/27/AGNs (New and known AGNs behind the LMC)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/746/27/AGNs?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/746/27/AGNs?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/746/27/AGNs?GETtext/xml+votable180.050000true72.6149583-70.1320.0055555555555555565/8263 8272 8274 6/33045 33046 33047 33049 33051 33072 33073 33075 33076 33077 33078 33100 33120https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/746/27?format=asciiOpticalInfrareddefaultJ/ApJ/746/27/table5Parameters of the remaining 677 targeted sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMQSSource name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharRAJ2000[4/5] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[68/72] Degree of Declination (J2000)pos.eq.dec;meta.mainVmag[15.318/22.46]? The V band magnitudemagphot.mag;em.opt.VfloatnullableImag[14.923/21.574] The I band magnitudemagphot.mag;em.opt.IfloatOGLEOGLE-III identification (lmcFFF.F.NNNNNN) (<OGLE LMCFFF.F NNNNNNN> in Simbad)meta.idcharClassOur spectral classification (1)src.classcharSclSimbad match code (object type) (1)src.classcharKK09Cross-match with Kozlowski et al., 2009, Cat. J/ApJ/701/508, within 2"meta.ref.urlintnullableJ/ApJ/746/27/AGNsNew and known AGNs behind the LMCrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMQSSource name (JHHMMSS.ss+DDMMSS.s(a))meta.id;meta.maincharf_MQS[*] Probable AGN (poor spectra) (1)meta.codecharRAJ2000[4,5] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[68,72] Degree of Declination (J2000)pos.eq.dec;meta.mainVmag[17.2,22.4]? The OGLE V band magnitudemagphot.mag;em.opt.VfloatnullableImag[16.7,21.2] The OGLE I band magnitudemagphot.mag;em.opt.Ifloatz[0.149,3.35] Spectroscopic redshiftsrc.redshiftfloatOGLEOGLE-III identification (lmcFFF.F.NNNNNN) (<OGLE LMCFFF.F NNNNNNN> in Simbad)meta.idcharClassKK09 (Cat. J/ApJ/701/508) class (2)src.classcharEmLinesList of emission linesmeta.id;spect.lineMIR?[Y/ ] Existence of mid-IR emission?meta.codecharX?[Y/ ] Existence of X-ray emission?meta.codecharVar?[Y/ ] Variable source?meta.codecharNoteVarious notes (3)meta.notecharKK09Cross-match with Kozlowski et al., 2009, Cat. J/ApJ/701/508, within 2"meta.ref.urlintnullable