J/MNRAS/498/L6ivo://CDS.VizieR/J/MNRAS/498/L6doi:10.26093/cds/vizier.74989006CDSMcGill P.Everall A.Boubert D.Smith L.C.2024-08-21T20:16:14Z2023-11-06T10:17:05ZCDS support team

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

cds-question@unistra.frgravitational-lensingvisible-astronomyPrecision astrometry from the second Gaia data release has allowed astronomers to predict 5787 microlensing events, with 528 of these having maximums within the extended Gaia mission (J2014.5-J2026.5). Future analysis of the Gaia time-series astrometry of these events will, in some cases, lead to precise gravitational mass measurements of the lens. We find that 61 per cent of events predicted during the extended Gaia mission with sources brighter than G=18 are likely to be spurious, with the background source in these cases commonly being either a duplicate detection or a binary companion of the lens. We present quality cuts to identify these spurious events and a revised list of microlensing event candidates. Our findings imply that half of the predictable astrometric microlensing events during the Gaia mission have yet to be identified.2020MNRAS.498L...6Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/498/L6CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)J/A+A/618/A44 : Predicted microlensing events from Gaia DR2 (Bramich, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/498/L6https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/498/L6http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/498/L6https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/498/L6https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/498/L6http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/498/L6GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap1.9867573869263685e-19 3.916500758235022e-19OpticaldefaultJ/MNRAS/498/L6/table1List of the microlensing events predicted using Gaia DR2GaiaDR2SGaia DR2 source identifier of the sourcemeta.id.assoc2MASSL2MASS source designation of the lensmeta.idchar2MASSS2MASS source designation of the sourcemeta.id.assoccharTminsepTime of closest approach of the lens and source (in julian years) as calculated by the study which found the eventyrtime.epochdoublevconfIndicates whether the source and lens have been identified in legacy imaging data (1)meta.codecharNobsNumber of times the source was observed by Gaia according to Boubert et al. 2020MNRAS.497.1826B)meta.numberintRefReference of the study that found the event (2)meta.ref;pos.framecharGmagLGaia DR2 G-band magnitude of the lensmagphot.mag;em.optfloatGmagSGaia DR2 G-band magnitude of the sourcemagphot.mag;em.optfloatsigmaALError in the along scan direction of the source (3)stat.errorfloatBP-RPL? Gaia DR2 BP-RP colour of the lensmagphot.color;em.opt.B;em.opt.RfloatnullableBP-RPS? Gaia DR2 BP-RP colour of the sourcemagphot.color;em.opt.B;em.opt.RfloatnullableMatchOALGaia DR2 number of astrometric matched observations for the lensmeta.numberintMatchOASGaia DR2 number of astrometric matched observations for the sourcemeta.numberintPsiAstrometric quality indicator {Psi} (4)meta.code.qualdoubleSolvedNumber of parameters of the source astrometric solution from Gaia DR2meta.numberintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaDR2LGaia DR2 source identifier of the lensmeta.id;meta.main