J/ApJ/751/122ivo://CDS.VizieR/J/ApJ/751/122doi:10.26093/cds/vizier.17510122CDSPopescu B.Hanson M.M.Elmegreen B.G.2017-09-27T05:55:48Z2014-02-13T16:35:56ZCDS support team

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

cds-question@unistra.fropen-star-clustersmagellanic-cloudsinfrared-photometryvisible-astronomybroad-band-photometryWe present new age and mass estimates for 920 stellar clusters in the Large Magellanic Cloud (LMC) based on previously published broadband photometry and the stellar cluster analysis package, MASSCLEANage. Expressed in the generic fitting formula, d^2^N/dMdt{prop.to}M^{alpha}^t^{beta}^, the distribution of observed clusters is described by {alpha}=-1.5 to -1.6 and {beta}=-2.1 to -2.2. For 288 of these clusters, ages have recently been determined based on stellar photometric color-magnitude diagrams, allowing us to gauge the confidence of our ages. The results look very promising, opening up the possibility that this sample of 920 clusters, with reliable and consistent age, mass, and photometric measures, might be used to constrain important characteristics about the stellar cluster population in the LMC. We also investigate a traditional age determination method that uses a {chi}^2^ minimization routine to fit observed cluster colors to standard infinite-mass limit simple stellar population models. This reveals serious defects in the derived cluster age distribution using this method. The traditional {chi}^2^ minimization method, due to the variation of U, B, V, R colors, will always produce an overdensity of younger and older clusters, with an underdensity of clusters in the log(age/yr)=[7.0,7.5] range. Finally, we present a unique simulation aimed at illustrating and constraining the fading limit in observed cluster distributions that includes the complex effects of stochastic variations in the observed properties of stellar clusters.2012ApJ...751..122Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/751/122CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/236 : UBVR CCD survey of the Magellanic clouds (Massey+, 2002)J/A+A/555/A131 : Fundamental parameters of LMC star clusters (Palma+, 2013)J/A+A/554/A16 : Age and metallicity relation in MC clusters (Livanou+, 2013)J/AJ/142/48 : LMC star clusters structural parameters (Werchan+, 2011)J/A+A/517/A50 : Ages of young SMC/LMC star clusters (Glatt+, 2010)J/MNRAS/389/678 : Extended objects in Magellanic Clouds (Bica+, 2008)J/MNRAS/386/1380 : BVRI photometry of LMC star clusters (Kumar+, 2008)J/AcA/50/337 : OGLE LMC star clusters (Pietrzynski+, 2000)J/AcA/49/521 : OGLE LMC star clusters BVI photometry (Pietrzynski+, 1999)J/AJ/117/2244 : HST color-magnitude diagrams of the LMC (Olsen, 1999)J/AJ/116/723 : LMC star clusters ages and metallicity (Bica+ 1998)http://www.physics.uc.edu/~popescu/massclean : MASSCLEAN package home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/751/122https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/751/122http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/751/122https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/751/122https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/751/122http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/751/122GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/751/122/table2 (Age and mass determination for 632 LMC clusters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/751/122/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/751/122/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/751/122/table2?GETtext/xml+votable180.050000true73.5041667-69.99666670.005555555555555556Cone search capability for table J/ApJ/751/122/table1 (Age and mass determination for 288 LMC clusters with CMD age)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/751/122/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/751/122/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/751/122/table1?GETtext/xml+votable180.050000true74.2708333-68.41333330.0055555555555555565/8269 8274 8280 6/33051 33053 33054 33055 33073 33074 33075 33084 33091 33094 33095 33100 33101 33102 33106 33107 33112 33126 33129https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/751/122?format=asciiOpticalInfrareddefaultJ/ApJ/751/122/table2Age and mass determination for 632 LMC clustersSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCluster namemeta.id;meta.maincharVMagIntegrated absolute V band magnitude (G1)magphys.magAbs;em.opt.Vfloate_VMagUncertainty in VMagmagstat.error;phot.mag;em.opt.VfloatU-BIntegrated (U-B)_0_ color index (G1)magphot.color;em.opt.U;em.opt.Bfloate_U-BUncertainty in U-Bmagstat.error;phot.color;em.opt.UfloatB-VIntegrated (B-V)_0_ color index (G1)magphot.color;em.opt.B;em.opt.Vfloate_B-VUncertainty in B-Vmagstat.error;phot.color;em.opt.BfloatV-RIntegrated (V-R)_0_ color index (G1)magphot.color;em.opt.V;em.opt.Rfloate_V-RUncertainty in V-Rmagstat.error;phot.color;em.opt.VfloatAge1Log of Hunter et al. 2003AJ....126.1836H agelog(yr)time.agefloatAgeLog of MASSCLEAN derived agelog(yr)time.agefloatE_AgeUpper uncertainty in Agelog(yr)stat.error;stat.maxfloate_AgeLower uncertainty in Agelog(yr)stat.error;time.agefloatMassMASSCLEAN derived masssolMassphys.massintE_MassUpper uncertainty in MasssolMassstat.error;stat.maxinte_MassLower uncertainty in MasssolMassstat.error;phys.massint_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.mainJ/ApJ/751/122/table1Age and mass determination for 288 LMC clusters with CMD ageSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCluster namemeta.id;meta.maincharVMagIntegrated absolute V band magnitude (G1)magphys.magAbs;em.opt.Vfloate_VMagUncertainty in VMagmagstat.error;phot.mag;em.opt.VfloatU-BIntegrated (U-B)_0_ color index (G1)magphot.color;em.opt.U;em.opt.Bfloate_U-BUncertainty in U-Bmagstat.error;phot.color;em.opt.UfloatB-VIntegrated (B-V)_0_ color index (G1)magphot.color;em.opt.B;em.opt.Vfloate_B-VUncertainty in B-Vmagstat.error;phot.color;em.opt.BfloatV-RIntegrated (V-R)_0_ color index (G1)magphot.color;em.opt.V;em.opt.Rfloate_V-RUncertainty in V-Rmagstat.error;phot.color;em.opt.VfloatAge1Log of Hunter et al. 2003AJ....126.1836H agelog(yr)time.agefloatAge2Log of Glatt et al. 2010, Cat. J/A+A/517/A50, CMD agelog(yr)time.agefloate_Age2Uncertainty in G10Agelog(yr)stat.errorfloatE(B-V)Glatt et al. 2010, Cat. J/A+A/517/A50, E(B-V) CMD color excessmagphot.color.excessfloatAgeLog of MASSCLEAN derived agelog(yr)time.agefloatE_AgeUpper uncertainty in Agelog(yr)stat.error;stat.maxfloate_AgeLower uncertainty in Agelog(yr)stat.error;time.agefloatMassMASSCLEAN derived masssolMassphys.massintE_MassUpper uncertainty in MasssolMassstat.error;stat.maxinte_MassLower uncertainty in MasssolMassstat.error;phys.massintG10Cross-match with Glatt et al., 2010 (J/A+A/517/A50) within 15"meta.ref.urlintnullable_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.main