J/ApJ/853/104ivo://CDS.VizieR/J/ApJ/853/104doi:10.26093/cds/vizier.18530104CDSBitsakis T.Gonzalez-Lopezlira R.A.Bonfini P.Bruzual G.Maravelias G.,Zaritsky D.Charlot S.Ramirez-Siordia V.H.2019-01-09T14:22:37Z2018-12-11T15:50:52ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsopen-star-clustersastronomical-object-identificationWe present a new study of the spatial distribution and ages of the star clusters in the Small Magellanic Cloud (SMC). To detect and estimate the ages of the star clusters we rely on the new fully automated method developed by Bitsakis+ (2017, J/ApJ/845/56). Our code detects 1319 star clusters in the central 18deg^2^ of the SMC we surveyed (1108 of which have never been reported before). The age distribution of those clusters suggests enhanced cluster formation around 240Myr ago. It also implies significant differences in the cluster distribution of the bar with respect to the rest of the galaxy, with the younger clusters being predominantly located in the bar. Having used the same setup, and data from the same surveys as for our previous study of the LMC, we are able to robustly compare the cluster properties between the two galaxies. Our results suggest that the bulk of the clusters in both galaxies were formed approximately 300Myr ago, probably during a direct collision between the two galaxies. On the other hand, the locations of the young (<=50Myr) clusters in both Magellanic Clouds, found where their bars join the HI arms, suggest that cluster formation in those regions is a result of internal dynamical processes. Finally, we discuss the potential causes of the apparent outside-in quenching of cluster formation that we observe in the SMC. Our findings are consistent with an evolutionary scheme where the interactions between the Magellanic Clouds constitute the major mechanism driving their overall evolution.2018ApJ...853..104Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/853/104CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+AS/125/229 : A standard stellar library (Lejeune+ 1997)J/AJ/123/855 : Magellanic Clouds Photometric Survey: the SMC (Zaritsky+, 2002)J/AJ/127/1531 : Star formation history of SMC (Harris+, 2004)J/AJ/129/2701 : UBVRI photometry of SMC star clusters (Rafelski+, 2005)J/A+A/452/179 : Ages of SMC young clusters and field stars (Chiosi+, 2006)J/ApJ/658/345 : CRIc photometry of Magellanic Bridge Fields (Harris, 2007)J/MNRAS/389/678 : Extended objects catalog in Magellanic Clouds (Bica+, 2008)J/AJ/138/1243 : The star formation history of the LMC (Harris+, 2009)J/A+A/517/A50 : Ages & luminosities of SMC/LMC star clusters (Glatt+, 2010)J/MNRAS/430/676 : Massive clusters in the LMC (Baumgardt+, 2013)J/A+A/597/A85 : NGC3627S and NGC3627N CO(1-0) data cubes (Beuther+, 2017)J/ApJ/845/56 : Star clusters automatically detected in LMC (Bitsakis+, 2017)J/A+A/616/A187 : SMC clusters age-dating + classification (Nayak+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/853/104https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/853/104http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/853/104https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/853/104https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/853/104http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/853/104GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/853/104/table1 (SMC star cluster catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/853/104/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/853/104/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/853/104/table1?GETtext/xml+votable180.050000true7.8256273-74.49140930.0055555555555555565/8323 8329 6/33287 33291 33296 33298 33304 33306 33307 33313 33315 33324 33326 33328 33329 33330 33336https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/853/104?format=asciidefaultJ/ApJ/853/104/table1SMC star cluster catalogIDCatalog identifiermeta.id;meta.tablecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000[7.5/18.6] Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-74.5/-70.7] Declination (J2000)degpos.eq.dec;meta.mainRad[0.006/0.03] Radiusdegphys.angSizedoublelogAge[6/10] Log of the agelog(yr)time.agedoublee_logAge[6/10] Lower 16% uncertainty bound in logAgelog(yr)stat.error;time.agedoubleE_logAge[6.8/10.2] Upper 84% uncertainty bound in logAgelog(yr)stat.error;stat.maxdoubleB08[31/542]? Bica+ (2008, J/MNRAS/389/678) catalog numbermeta.id.crossintnullableSimbadSimbadName for the Bica+ (2008, J/MNRAS/389/678) objectmeta.id.crosschar