J/MNRAS/506/2482ivo://CDS.VizieR/J/MNRAS/506/2482doi:10.26093/cds/vizier.75062482CDSHusseiniova A.McGill P.Smith L.C.Evans N.W.2024-11-21T20:15:57Z2024-07-01T13:02:53ZCDS support team

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

cds-question@unistra.frmilky-way-galaxygravitational-lensinginfrared-sourcesinfrared-photometryThe VISTA Variables in the Via Lactea (VVV) survey and its extension have been monitoring about 560 deg^2^ of sky centred on the Galactic bulge and inner disc for nearly a decade. The photometric catalogue contains of order 10^9^ sources monitored in the K_s_ band down to 18 mag over hundreds of epochs from 2010 to 2019. Using these data we develop a decision tree classifier to identify microlensing events. As inputs to the tree, we extract a few physically motivated features as well as simple statistics ensuring a good fit to a microlensing model both on and off the event amplification. This produces a fast and efficient classifier trained on a set of simulated microlensing events and catacylsmic variables, together with flat baseline light curves randomly chosen from the VVV data. The classifier achieves 97 per cent accuracy in identifying simulated microlensing events in a validation set. We run the classifier over the VVV data set and then visually inspect the results, which produces a catalogue of 1959 microlensing events. For these events, we provide the Einstein radius crossing time via a Bayesian analysis. The spatial dependence on recovery efficiency of our classifier is well characterized, and this allows us to compute spatially resolved completeness maps as a function of Einstein crossing time over the VVV footprint. We compare our approach to previous microlensing searches of the VVV. We highlight the importance of Bayesian fitting to determine the microlensing parameters for events with surveys like VVV with sparse data.2021MNRAS.506.2482Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/506/2482CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/376 : VISTA Variable in the Via Lactea Survey (VVV) DR4.2J/ApJ/889/56 : VVV survey microlensing events; -3.7<b{<}-3.9{deg}J/ApJ/893/65 : VVV Survey microlensing events in the Gal. BulgeII/364 : VIRAC. The VVV Infrared Astrometric Catalogue (Smith+, 2019)J/ApJS/244/29 : Microlensing events toward the Galactic bulge (Mroz+, 2019)J/ApJS/216/12 : OGLE-III Galactic bulge microlensing eventshttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/506/2482https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/506/2482http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/506/2482https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/506/2482https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/506/2482http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/506/2482GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/506/2482/tablea1 (*Posterior inferences on the PSPL microlensing model parameters for all found microlensing events)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/506/2482/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/506/2482/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/506/2482/tablea1?GETtext/xml+votable180.050000true196.9165844-62.52477430.0055555555555555563/450 4/1804 1807 2653 5/7179 7181-7183 7194 7220 7222-7225 7266 7272 7316 10418 10420 10445 10453 10553 10556-10557 10594 10598 10609 10620 10624 6/28675 28686-28687 28696-28697 28700 28702 28706-28707 28709 28713-28715 28721-28723 28737-28739 28763 28768 28774 28780-28782 28787-28788 28790 28792 28794-28796 28798-28799 28884-28885 28887 28904 28906-28910 28940 28960 28969 28974 29058-29059 29096-29098 29189 29200-29201 29204-29205 29248-29250 29252-29254 29261 29268-29269 29271 29273 29276 29440 37893 37895 37904 37906 41466 41471 41597-41599 41631 41654-41655 41657 41660 41663 41676-41677 41684 41686-41687 41689 41696-41697 41704 41754 41759 41762-41763 41765 41767 41770 41772-41773 41778-41779 41794 41798-41799 41801-41804 41810-41811 41816 41820 41825 41857 42156 42159 42163 42166-42167 42169-42170 42172-42173 42175 42202-42203 42205-42209 42211 42216-42218 42220-42221 42232-42233 42333 42346 42355-42357 42365-42367 42380-42382 42387 42389-42391 42397 42399-42400 42404 42416 42421 42433-42435 42440-42441 42444-42445 42447 42465 42469 42471 42476-42477 42484-42485 42487-42488 42493-42495 42500-42502 42504 42516 43014-43015 43019-43021 43024-43025 43028 43033 43040 430427.952274030004205e-20 1.0188844282367877e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/506/2482?format=asciiInfrareddefaultJ/MNRAS/506/2482/tablea1*Posterior inferences on the PSPL microlensing model parameters for all found microlensing eventsu05050th posterior percentile of u_0_ impact parameter (u0_50) (3)src.impactParamdoubleu08484th posterior percentile of u_0_ impact parameter (u0_84) (3)src.impactParamdoubletE1616th posterior percentile of t_E_ Einstein time (tE_16) (4)dtime.epochdoubletE5050th posterior percentile of t_E_ Einstein time (tE_50) (4)dtime.epochdoubletE8484th posterior percentile of t_E_ Einstein time (tE_84) (4)dtime.epochdoublet01616th posterior percentile of closest approach time in modified julian date (t0_16) (5)dtime.epochdoublet05050th posterior percentile of closest approach time in modified julian date (t0_50) (5)dtime.epochdoublet08484th posterior percentile of closest approach time in modified julian date (t0_84) (5)dtime.epochdoublefbl1616th posterior percentile of blending fraction (fbl_16) (6)meta.numberdoublefbl5050th posterior percentile of blending fraction (fbl_50) (6)meta.numberdoublefbl8484th posterior percentile of blending fraction (fbl_84) (6)meta.numberdoubleDETEvent detected in previous search (8)meta.codecharSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDEvent designation name (Event_ID) (1)meta.id;meta.maincharRA_ICRSBarycentric right ascension (ICRS) at Ep=2015.5 (ra) (2)degpos.eq.ra;meta.mainDE_ICRSBarycentric declination (ICRS) at Ep=2015.5 (dec) (2)degpos.eq.dec;meta.mainu01616th posterior percentile of u_0_ impact parameter (u0_16) (3)src.impactParamdoublem016mag16th posterior percentile of m_0_ baseline magnitude in the infrared Ks band at 2.15 {mu}m (m0_16) (7)magphot.mag;em.IR.Kdoublem050mag50th posterior percentile of m_0_ baseline magnitude in the infrared Ks band at 2.15 {mu}m (m0_50) (7)magphot.mag;em.IR.Kdoublem084mag84th posterior percentile of m_0_ baseline magnitude in the infrared Ks band at 2.15 {mu}m (m0_84) (7)magphot.mag;em.IR.Kdouble