J/ApJ/845/56ivo://CDS.VizieR/J/ApJ/845/56doi:10.26093/cds/vizier.18450056CDSBitsakis T.Bonfini P.Gonzalez-Lopezlira R.A.Ramirez-Siordia V.H.,Bruzual G.Charlot S.Maravelias G.Zaritsky D.2018-05-16T07:08:00Z2018-04-16T16:12:27ZCDS support team

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

cds-question@unistra.frstellar-associationsmagellanic-cloudssurveysWe present our new, fully automated method to detect and measure the ages of star clusters in nearby galaxies, where individual stars can be resolved. The method relies purely on statistical analysis of observations and Monte-Carlo simulations to define stellar overdensities in the data. It decontaminates the cluster color-magnitude diagrams and, using a revised version of the Bayesian isochrone fitting code of Ramirez-Siordia+ (2017, in prep.), estimates the ages of the clusters. Comparisons of our estimates with those from other surveys show the superiority of our method to extract and measure the ages of star clusters, even in the most crowded fields. An application of our method is shown for the high-resolution, multiband imaging of the Large Magellanic Cloud. We detect 4850 clusters in the 7deg^2^ we surveyed, 3451 of which have not been reported before. Our findings suggest multiple epochs of star cluster formation, with the most probable occurring ~310Myr ago. Several of these events are consistent with the epochs of the interactions among the Large and Small Magellanic Clouds, and the Galaxy, as predicted by N-body numerical simulations. Finally, the spatially resolved star cluster formation history may suggest an inside-out cluster formation scenario throughout the LMC, for the past 1Gyr.2017ApJ...845...56Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/845/56CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/183 : The Cluster System of the LMC (Kontizas+ 1990)VI/102 : Geneva stellar evolution tracks and isochrones (Lejeune+, 2001)II/305 : SAGE LMC and SMC IRAC Source Catalog (IPAC 2009)J/A+AS/110/533 : Clusters and field stars in LMC. I. (Linde+, 1995)J/AJ/116/723 : LMC star clusters ages and metallicity (Bica+ 1998)J/AJ/117/2244 : HST color-magnitude diagrams of the LMC (Olsen, 1999)J/AJ/119/1748 : WFPC 2 imaging of young LMC clusters (Keller+, 2000)J/AcA/50/337 : OGLE LMC star clusters (Pietrzynski+, 2000)J/AJ/128/1606 : Magellanic Clouds Photometric Survey: LMC (Zaritsky+, 2004)J/MNRAS/357/645 : LMC far-UV HST observations (Almoznino+, 2005)J/AJ/132/2268 : SAGE calibration stars (Meixner+, 2006)J/MNRAS/389/678 : Extended objects in Magellanic Clouds (Bica+, 2008)J/AJ/138/1243 : The star formation history of the LMC (Harris+, 2009)J/A+A/503/469 : Compact clusters in LMC catalogue of stars (Liu+, 2009)J/A+A/517/A50 : Ages & luminosities of SMC/LMC star clusters (Glatt+, 2010)J/MNRAS/403/1213 : Tracers of stellar mass-loss. I. (Gonzalez-Lopezlira+, 2010)J/AJ/142/48 : LMC star clusters structural parameters (Werchan+, 2011)J/MNRAS/425/3085 : CCD CT1 data of stars in the field of B119 (Piatti+, 2012)J/ApJ/749/124 : Spectroscopy on LMC clusters (Colucci+, 2012)J/ApJ/751/122 : Ages and masses for 920 LMC clusters (Popescu+, 2012)J/A+A/555/A131 : Fundamental param. of star clusters in LMC (Palma+, 2013)J/MNRAS/430/676 : Massive clusters in the LMC (Baumgardt+, 2013)J/MNRAS/436/136 : Ages and masses of LMC clusters (de Grijs+, 2013)J/MNRAS/454/839 : VMC survey. XVI. (Piatti+, 2015)J/A+A/586/A41 : LMC star clusters catalog (Palma+, 2016)J/A+A/606/A21 : LMC bar star clusters (Piatti, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/845/56https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/845/56http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/845/56https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/845/56https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/845/56http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/845/56GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/845/56/table2 (Star cluster catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/845/56/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/845/56/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/845/56/table2?GETtext/xml+votable180.050000true75.9815521-70.61355590.0055555555555555564/2068 5/8263 8268 8269 8276 8277 8278 8280 8281 6/33045 33046 33047 33049 33050 33051 33080 33081 33084 33085 33116 33117 33118 33128 33129 33132 33133 33136 33137 33138 37514 37536 37538 37544 37546https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/845/56?format=asciidefaultJ/ApJ/845/56/table2Star cluster catalogCIDCluster identifiermeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000[68.9/91.5] Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-72.5/-65.1] Declination (J2000)degpos.eq.dec;meta.mainRad[0.004/0.03] Cluster radiusdegphys.angSizedoublelogAge[6.7/9.8] Log cluster agelog(yr)time.agedoubleb_logAge[6.7/9.7] Lower logAge boundarylog(yr)time.age;stat.mindoubleB_logAge[6.8/10] Upper logAge boundarylog(yr)time.age;stat.maxdouble