J/MNRAS/356/331ivo://CDS.VizieR/J/MNRAS/356/331doi:10.26093/cds/vizier.73560331CDSSumi T.Wozniak P.R.Eyer L.Dobrzycki A.Udalski A.Szymanski M.K.,Kubiak M.Pietrzynski G.Soszynski I.Zebrun K.Szewczyk O.,Wyrzykowski L.2024-06-30T20:16:59Z2007-12-05T23:57:23ZCDS support team

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

cds-question@unistra.frquasarsccd-photometryWe present 97 QSO candidates in 48 Galactic bulge fields of the Optical Gravitational Lensing Experiment II (OGLE-II) covering ~11deg^2^, which are selected via their variability. We extend light curves of variable objects which were detected in a 3-yr baseline in the OGLE-II variable star catalogue to fourth year. We search for objects that are faint (16<I_0_<18.5) and slowly variable over 4-yr in this catalogue by using the variogram/structure function. Finding the QSOs in such stellar-crowded and high extinction fields is challenging, but should be useful for the astrometric reference frame. Spectroscopic follow-up observations are required to confirm these QSO candidates. Follow-up observations are being prepared for four of these fields (BUL_SC1, 2, 32 and 45). Follow-up observations for other fields are strongly encouraged. The complete list and light curves of all 97 candidates are available in electronic format at http://www.astro.princeton.edu/sumi/QSO-OGLEII/ .2005MNRAS.356..331Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/356/331CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toftp://sirius.astrouw.edu.pl/ogle : OGLE DataBasehttp://www.astro.princeton.edu/~sumi/QSO-OGLEII : Home Page of the paperJ/AcA/52/129 : DIA OGLE2 candidate variable stars catalog (Wozniak+ 2002)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/356/331https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/356/331http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/356/331https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/356/331https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/356/331http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/356/331GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/356/331/table2 (The list of the 97 QSO candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/356/331/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/356/331/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/356/331/table2?GETtext/xml+votable180.050000true270.6787917-29.91741670.0055555555555555565/7205 6/28706-28707 28713 28716 28719 28725 28730 28735 28770 28776 28778-28779 28782 28864-28866 28868-28869 28871 28880 28887 28910-28911 29059 29062 29065 29068 42349 42351https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/356/331?format=asciiOpticaldefaultJ/MNRAS/356/331/table2The list of the 97 QSO candidatesImagI magnitudemagphot.mag;em.opt.IfloatXposX positionpixpos.cartesian.x;instr.detfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFieldField number (field name is BUL_SC NN)meta.id;obs.fieldintVIDVariable number, in the field (1)meta.id;obs.fieldintIDIdentification number, in the field (2)meta.id;obs.fieldintYposY positionpixpos.cartesian.y;instr.detfloatRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainV-I? V-I colour indexmagphot.color;em.opt.V;em.opt.IfloatnullableIcmag? Extinction corrected I magnitudemagphot.mag;em.opt.Ifloatnullable(V-I)c? Extinction corrected V-I colour indexmagphot.color;em.opt.V;em.opt.IfloatnullableSvarVariogram slope (3)src.var.indexfloatOGLE2Display the details from the OGLE2 data (J/AcA/52/129)meta.ref.urlchar