J/AJ/148/24ivo://CDS.VizieR/J/AJ/148/24doi:10.26093/cds/vizier.51480024CDSSchultheis M.Zasowski G.Allende Prieto C.Anders F.Beaton R.L.,Beers T.C.Bizyaev D.Chiappini C.Frinchaboy P.M.Garcia Perez A.E.,Ge J.Hearty F.Holtzman J.Majewski S.R.Muna D.Nidever D.,Shetrone M.Schneider D.P.2014-11-22T11:43:24Z2014-11-06T09:06:02ZCDS support team

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

cds-question@unistra.frmilky-way-galaxyextinctiongiant-starsGalactic interstellar extinction maps are powerful and necessary tools for Milky Way structure and stellar population analyses, particularly toward the heavily reddened bulge and in the midplane. However, due to the difficulty of obtaining reliable extinction measures and distances for a large number of stars that are independent of these maps, tests of their accuracy and systematics have been limited. Our goal is to assess a variety of photometric stellar extinction estimates, including both two-dimensional and three-dimensional extinction maps, using independent extinction measures based on a large spectroscopic sample of stars toward the Milky Way bulge. We employ stellar atmospheric parameters derived from high-resolution H-band Apache Point Observatory Galactic Evolution Experiment (APOGEE) spectra, combined with theoretical stellar isochrones, to calculate line-of-sight extinction and distances for a sample of more than 2400 giants toward the Milky Way bulge. We compare these extinction values to those predicted by individual near-IR and near+mid-IR stellar colors, two-dimensional bulge extinction maps, and three-dimensional extinction maps. The long baseline, near+mid-IR stellar colors are, on average, the most accurate predictors of the APOGEE extinction estimates, and the two-dimensional and three-dimensional extinction maps derived from different stellar populations along different sightlines show varying degrees of reliability. We present the results of all of the comparisons and discuss reasons for the observed discrepancies. We also demonstrate how the particular stellar atmospheric models adopted can have a strong impact on this type of analysis, and discuss related caveats.2014AJ....148...24Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/148/24CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/550/A42 : Extinction map towards the Galactic bulge (Chen+, 2013)J/AJ/146/133 : Stellar parameters from SDSSIII APOGEE DR10 (Meszaros+, 2013)J/ApJ/737/73 : Infrared extinction toward the Galactic Centre (Fritz+, 2011)J/ApJ/707/89 : Variation of mid-IR extinction (Gao+, 2009)J/A+A/453/635 : Modelling the Galactic Interstellar ExtinctionJ/MNRAS/338/253 : K extinction near the Galactic Centre (Dutra+, 2003)J/A+A/349/L69 : Interstellar extinction (Schultheis+, 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/148/24https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/148/24http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/148/24https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/148/24https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/148/24http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/148/24GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/148/24/table1 (Derived extinction and distances from our Apache Point Observatory Galactic Evolution Experiment (APOGEE) sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/148/24/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/148/24/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/148/24/table1?GETtext/xml+votable180.050000true258.9027406-27.76880250.0055555555555555564/1803 5/7194 7206 7207 7216 7224 7226 7227 7229 7297 7301 6/28727 28732 28733 28735 28770 28813 28815 28818 28823 28837 28839 28868 28872 28874 28875 28902 28903 28913 28915 28920 28921 28922 28924 28925 29185 29187 29196 29201 29203 29212 29213 29248 29250 29256https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/148/24?format=asciiOpticaldefaultJ/AJ/148/24/table1Derived extinction and distances from our Apache Point Observatory Galactic Evolution Experiment (APOGEE) sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS identifier (HHMMSSss+DDMMSSs; J2000)meta.id;meta.maincharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainAK[-0.24/3.9] Derived Ks band extinctionmagphys.absorption;em.IR.Kfloate_AK[0/0.19] Uncertainty in AKmagstat.error;phys.absorption;em.IR.KfloatDist[0.4/63] Derived distancekpcpos.distance;pos.heliocentricfloate_Dist[0.2/355] Percent uncertainty in Dist%stat.error;arith.ratio;pos.distancefloatAK1[0/2.8]? Rayleigh-Jeans color excess derived Ks band extinction (1)magphys.absorption;em.IR.KfloatnullableAK2[0/2.4]? Nidever et al. (2012ApJS..201...35N) derived Ks band extinction (2)magphys.absorption;em.IR.KfloatnullableAK3[0/2.4]? Gonzalez et al. 2012A&A...543A..13G derived Ks band extinction (3)magphys.absorption;em.IR.KfloatnullableAK4[0/4.9]? E(H-Ks) color-excess derived Ks band extinction (4)magphys.absorption;em.IR.Kfloatnullable