J/ApJ/858/31ivo://CDS.VizieR/J/ApJ/858/31doi:10.26093/cds/vizier.18580031CDSSun N.-C.de Grijs R.Cioni M.-R.L.Rubele S.Subramanian S.,van Loon J.T.Bekki K.Bell C.P.M.Ivanov V.D.Marconi M.Muraveva T.,Oliveira J.M.Ripepi V.2019-05-07T11:54:30Z2019-04-26T13:29:47ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsyoung-stellar-objectsinfrared-sourcesIn this paper we report a clustering analysis of upper main-sequence stars in the Small Magellanic Cloud, using data from the VMC survey (the VISTA near-infrared YJKs survey of the Magellanic system). Young stellar structures are identified as surface overdensities on a range of significance levels. They are found to be organized in a hierarchical pattern, such that larger structures at lower significance levels contain smaller ones at higher significance levels. They have very irregular morphologies, with a perimeter-area dimension of 1.44+/-0.02 for their projected boundaries. They have a power-law mass-size relation, power-law size/mass distributions, and a log-normal surface density distribution. We derive a projected fractal dimension of 1.48+/-0.03 from the mass-size relation, or of 1.4+/-0.1 from the size distribution, reflecting significant lumpiness of the young stellar structures. These properties are remarkably similar to those of a turbulent interstellar medium, supporting a scenario of hierarchical star formation regulated by supersonic turbulence.2018ApJ...858...31Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/858/31CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/351 : VISTA Magellanic Survey (VMC) catalog (Cioni+, 2011)J/AcA/48/175 : OGLE LMC clusters (Pietrzynski+ 1998)J/ApJ/561/727 : BVI photometry in the Antennae galaxies (Zhang+, 2001)J/AJ/123/855 : Magellanic Clouds Photometric Survey: SMC (Zaritsky+, 2002)J/AJ/128/1606 : Magellanic Clouds Photometric Survey: LMC (Zaritsky+, 2004)J/MNRAS/389/678 : Cat. of extended objects in Magellanic Clouds (Bica+, 2008)J/MNRAS/403/996 : Clusters and associations in SMC and LMC (Bonatto+, 2010)J/ApJ/723/492 : Properties of GRS molecular clouds (Roman-Duval+, 2010)J/A+A/554/A33 : VMC Survey. VII. 30 Doradus reddening map (Tatton+, 2013)J/MNRAS/442/1680 : Red giants in SMC. Abundances (Dobbie+, 2014)J/ApJ/787/107 : Spatial structure of young stellar clusters. (Kuhn+, 2014)J/MNRAS/452/3508 : Young stellar structures in NGC 6503 (Gouliermis+, 2015)J/MNRAS/449/639 : VMC survey. XIV. SFR in SMC (Rubele+, 2015)J/ApJS/224/21 : VMC survey. XIX. Classical Cepheids in SMC (Ripepi+, 2016)J/ApJ/849/149 : VMC XXVII. Young stellar structures in the LMC (Sun+, 2017)http://horus.roe.ac.uk/vsa/ : VISTA Science Archive home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/858/31https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/858/31http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/858/31https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/858/31https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/858/31http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/858/31GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/858/31/table1 (Identified young stellar structures)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/858/31/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/858/31/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/858/31/table1?GETtext/xml+votable180.050000true13.6355-72.79210.0055555555555555566/33293 33294 33295 33297 33298 33299 33304 33306 33307 33316 33317 33319 33328 33409https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/858/31?format=asciiInfrareddefaultJ/ApJ/858/31/table1Identified young stellar structuresN*[5/31487] Stellar numbermeta.numberintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/566] Running sequence number for each young stellar structure (<[SDC2018] NNN> in Simbad)meta.id;meta.mainintlevel[1/15] Significance levelstat.fit.goodnessintRAJ2000[5.2/22.8] Right Ascension (J2000) (1)degpos.eq.ra;meta.mainDEJ2000[-73.7/-70.6] Declination (J2000) (1)degpos.eq.dec;meta.mainRad[2.8/1046.2] Size, radiuspcphys.size.radiusfloatsigma[0.004/0.5] Surface densitypc**-2phot.flux.density.sbfloat