J/AJ/170/328ivo://CDS.VizieR/J/AJ/170/328CDSZelakiewicz A.S.Johnson S.A.Gaudi B.S.Bryden G.Nataf D.M.,Shvartzvald Y.2026-09-01T08:08:46Z2026-09-01T09:04:49ZCDS support team

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

cds-question@unistra.frextinctioninfrared-photometrygalactic-centermilky-way-galaxyinterstellar-reddeningtwo-color-diagramsThe Galactic bulge is one of the most information-dense regions to study resolved stellar populations, variables, and transients, such as microlensing events. Studies toward the Galactic bulge are complicated by the large and variable extinction along the line of sight. We measure the near-infrared A_KS_ extinction and E(H-K_S_) reddening in this region using H- and K-band photometry obtained with the 2017 UKIRT microlensing survey. We fit the apparent magnitude and color distribution of bright giants in the bulge to recover the apparent magnitude and color of Red Clump stars, which are known to be standard candles and crayons. We present 2'x2' resolution maps in UKIRT fields between -2.15{deg}<=l<=2.71{deg} and -2.69{deg}<=b<=2.03{deg} of the A_KS_ extinction and the E(H-K_S_) reddening. We find large variations in the KS-band extinction and E(H-K_S_) reddening on all the scales we probe. We find that a constant, standard extinction law is a poor representation of the relationship between the extinction and reddening we measure in fields of different latitudes. These maps will be useful for understanding the near-infrared extinction law for sight lines close to the Galactic plane, as well as for final field selection for the Nancy Grace Roman Space Telescope Galactic Bulge Time Domain Survey.2025AJ....170..328Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/170/328CatalogResearchIsServedByTAP VizieR generic servicerelated-toII/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)II/361 : MDFC Version 10 (Cruzalebes+, 2019)J/A+A/349/L69 : Interstellar extinction (Schultheis+, 1999)J/ApJ/809/77 : Transiting Exoplanet Survey Satellite (TESS) (Sullivan+, 2015)J/ApJ/827/139 : Microlens. opt. depth & event rates from MOA-II (Sumi+, 2016)J/ApJ/885/131 : ~200 high-mass SFR plx & proper motion with VLBI (Reid+, 2019)J/A+A/644/A140 : VVVEXMAP-BULGE High resolution reddening map (Surot+, 2020)J/A+A/649/A83 : Milky Way nuclear disk KMOS survey (Fritz+, 2021)J/A+A/680/A56 : DES supernova host galaxies fits (Duarte+, 2023)J/AJ/166/107 : 6111 micro-lensing events with MOA (Koshimoto+, 2023)J/ApJS/269/28 : Microlensing event rate in the GC. I. UKIRT obs. (Wen+, 2023)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/170/328https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/170/328http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/170/328https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/170/328https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/170/328http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/170/328GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfrareddefaultJ/AJ/170/328/table2Lines of sight from the UKIRT extinction and reddening mapsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintl[-2.16/2.72] Galactic longitudedegpos.galactic.londoubleb[-2.7/2.031] Galactic latitudedegpos.galactic.latdoubleAKs[-0.391/4.34] The Ks band extinctionmagphys.absorption;em.IR.KdoubleE_AKs[0.01/4.01] Difference between 84th & 50th percentiles of AKsmagstat.error;stat.min;phys.absorptiondoublee_AKs[0.01/3.85] Difference between 50th & 16th percentiles of AKsmagstat.error;stat.max;phys.absorptiondoubleE(H-Ks)[0.066/2.62]? The (H-Ks) redenningmagphot.color.excess;em.IR.H;em.IR.Kdoublenullablee_E(H-Ks)[0.028/1.28]? Square root of the variance in E(H-Ks)magstat.error;phot.color.excess;em.IR.HdoublenullableFlag[0/1] Boolean; Is the field flagged as a lower limit on the extinction and reddening? (1)meta.code.errorint