J/ApJ/858/31      VMC survey. XXIX. Star formation in the SMC      (Sun+, 2018)

The VMC survey. XXIX. Turbulence-controlled hierarchical star formation in the Small Magellanic Cloud. Sun 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. <Astrophys. J., 858, 31 (2018)> =2018ApJ...858...31S 2018ApJ...858...31S
ADC_Keywords: Magellanic Clouds; YSOs; Infrared sources Keywords: galaxies: star clusters: general; infrared: stars; Magellanic Clouds; stars: formation Abstract: In 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. Description: Data used in this work come from the VMC survey, which is carried out with the VISTA telescope. We refer to Cioni+ (2011, II/351) for a comprehensive description of the VMC survey. The data are retrieved from the VISTA Science Archive. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 43 566 Identified young stellar structures -------------------------------------------------------------------------------- See also: II/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 page Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 3 I3 --- Seq [1/566] Running sequence number for each young stellar structure (<[SDC2018] NNN> in Simbad) 5- 6 I2 --- level [1/15] Significance level 8- 14 F7.4 deg RAdeg [5.2/22.8] Right Ascension (J2000) (1) 16- 23 F8.4 deg DEdeg [-73.7/-70.6] Declination (J2000) (1) 25- 30 F6.1 pc Rad [2.8/1046.2] Size, radius 32- 36 I5 --- N* [5/31487] Stellar number 38- 43 F6.4 pc-2 sigma [0.004/0.5] Surface density -------------------------------------------------------------------------------- Note (1): The right ascension and declination of the center of each young stellar structure, defined as RAdeg=(RAdeg-min+RAdeg-max)/2, where RAdegmin and RAdegmax are the minimum and maximum right ascension of the iso-density contour of each structure, respectively. -------------------------------------------------------------------------------- History: From electronic version of the journal References: Cioni et al. 2011Msngr.144...25C 2011Msngr.144...25C Cioni et al. Paper I 2011A&A...527A.116C 2011A&A...527A.116C Cat. II/351 Miszalski et al. Paper II 2011A&A...531A.157M 2011A&A...531A.157M Gullieuszik et al. Paper III 2012A&A...537A.105G 2012A&A...537A.105G Rubele et al. Paper IV 2012A&A...537A.106R 2012A&A...537A.106R Ripepi et al. Paper V 2012MNRAS.424.1807R 2012MNRAS.424.1807R Cat. J/MNRAS/424/1807 Cioni et al. Paper VI 2013A&A...549A..29C 2013A&A...549A..29C Cat. J/A+A/549/29 Tatton et al. Paper VII 2013A&A...554A..33T 2013A&A...554A..33T Cat. J/A+A/554/A33 Ripepi et al. Paper VIII 2014MNRAS.437.2307R 2014MNRAS.437.2307R Cat. J/MNRAS/437/2307 Cioni et al. Paper IX 2014A&A...562A..32C 2014A&A...562A..32C Moretti et al. Paper X 2014MNRAS.437.2702M 2014MNRAS.437.2702M Cat. J/MNRAS/437/2702 Li et al. Paper XI 2014ApJ...790...35L 2014ApJ...790...35L Piatti et al. Paper XII 2014A&A...570A..74P 2014A&A...570A..74P Ripepi et al. Paper XIII 2015MNRAS.446.3034R 2015MNRAS.446.3034R Cat. J/MNRAS/446/3034 Rubele et al. Paper XIV 2015MNRAS.449..639R 2015MNRAS.449..639R Cat. J/MNRAS/449/639 Piatti et al. Paper XV 2015MNRAS.450..552P 2015MNRAS.450..552P Piatti et al. Paper XVI 2015MNRAS.454..839P 2015MNRAS.454..839P Cat. J/MNRAS/454/839 Cioni et al. Paper XVII 2016A&A...586A..77C 2016A&A...586A..77C Zhang et al. Paper XVIII 2015ApJ...815...95Z 2015ApJ...815...95Z Ripepi et al. Paper XIX 2016ApJS..224...21R 2016ApJS..224...21R Cat. J/ApJS/224/21 Moretti et al. Paper XX 2016MNRAS.459.1687M 2016MNRAS.459.1687M Cat. J/MNRAS/459/1687 Piatti et al. Paper XXI 2016MNRAS.460..383P 2016MNRAS.460..383P Sun et al. Paper XXII 2017ApJ...835..171S 2017ApJ...835..171S Marconi et al. Paper XXIII 2017MNRAS.466.3206M 2017MNRAS.466.3206M Subramanian et al. Paper XXIV 2017MNRAS.467.2980S 2017MNRAS.467.2980S Ripepi et al. Paper XXV 2017MNRAS.472..808R 2017MNRAS.472..808R Muraveva et al. Paper XXVI 2018MNRAS.473.3131M 2018MNRAS.473.3131M Sun et al. Paper XXVII 2017ApJ...849..149S 2017ApJ...849..149S Cat. J/ApJ/849/149 Niederhofer et al. Paper XXVIII 2018A&A...612A.115N 2018A&A...612A.115N Sun et al. Paper XXIX 2018ApJ...858...31S 2018ApJ...858...31S This catalog Niederhofer et al. Paper XXX 2018A&A...613L...8N 2018A&A...613L...8N Rubele et al. Paper XXXI 2018MNRAS.478.5017R 2018MNRAS.478.5017R Zivkov et al. Paper XXXII 2018A&A...620A.143Z 2018A&A...620A.143Z Groenewegen et al. Paper XXXIII 2019A&A...622A..63G 2019A&A...622A..63G
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 15-Mar-2019
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