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J/ApJ/849/149    VMC XXVII. Young stellar structures in the LMC    (Sun+, 2017)

The VMC survey. XXVII. Young stellar structures in the LMC's bar star-forming complex. Sun N.-C., de Grijs R., Subramanian S., Bekki K., Bell C.P.M., Cioni M.-R.L., Ivanov V.D., Marconi M., Oliveira J.M., Piatti A.E., Ripepi V., Rubele S., Tatton B.L., van Loon J.T. <Astrophys. J., 849, 149 (2017)> =2017ApJ...849..149S
ADC_Keywords: Magellanic Clouds; Infrared sources; Surveys Keywords: infrared: stars ; Magellanic Clouds ; stars: formation Abstract: Star formation is a hierarchical process, forming young stellar structures of star clusters, associations, and complexes over a wide range of scales. The star-forming complex in the bar region of the Large Magellanic Cloud is investigated with upper main-sequence stars observed by the VISTA Survey of the Magellanic Clouds. The upper main-sequence stars exhibit highly nonuniform distributions. Young stellar structures inside the complex are identified from the stellar density map as density enhancements of different significance levels. We find that these structures are hierarchically organized such that larger, lower-density structures contain one or several smaller, higher- density ones. They follow power-law size and mass distributions, as well as a lognormal surface density distribution. All these results support a scenario of hierarchical star formation regulated by turbulence. The temporal evolution of young stellar structures is explored by using subsamples of upper main-sequence stars with different magnitude and age ranges. While the youngest subsample, with a median age of log(τ/yr)=7.2, contains the most substructure, progressively older ones are less and less substructured. The oldest subsample, with a median age of log(τ/yr)=8.0, is almost indistinguishable from a uniform distribution on spatial scales of 30-300pc, suggesting that the young stellar structures are completely dispersed on a timescale of ∼100Myr. These results are consistent with the characteristics of the 30 Doradus complex and the entire Large Magellanic Cloud, suggesting no significant environmental effects. We further point out that the fractal dimension may be method dependent for stellar samples with significant age spreads. Description: Data used in this work are from the VMC survey (Cioni+ 2011, II/351), which is carried out with the Visible and Infrared Survey Telescope for Astronomy (VISTA). The VMC survey is a multiepoch, uniform, and homogeneous photometric survey of the Magellanic System (LMC, SMC, Bridge, and Stream). It uses the near-infrared Y, J, and Ks bands, and the typical spatial resolution is ∼1" or better. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 42 123 Identified young stellar structures
See also: II/351 : VISTA Magellanic Survey (VMC) catalog (Cioni+, 2011) J/A+AS/104/379 : Integrated Photometry of open clusters (Battinelli+ 1994) J/A+A/397/473 : HST photometry of M51 cluster (Bik+, 2003) J/AJ/127/1531 : Star formation history of SMC (Harris+, 2004) J/AJ/127/1632 : UBVR(UIT) photometry of O and OB stars in SMC (Oey+, 2004) J/AJ/128/1606 : Magellanic Clouds Photometric Survey: LMC (Zaritsky+, 2004) J/AJ/132/2268 : SAGE calibration stars (Meixner+, 2006) J/ApJS/178/56 : CO observations of LMC Giant Molecular clouds (Fukui+, 2008) J/AJ/138/1243 : The star formation history of the LMC (Harris+, 2009) J/MNRAS/403/996 : Clusters and associations in SMC and LMC (Bonatto+, 2010) J/ApJ/723/492 : Physical data of GRS molecular clouds (Roman-Duval+, 2010) J/ApJ/727/64 : Young stellar groups & their massive stars (Kirk+, 2011) J/A+A/542/A66 : YSOs in 9 LMC star forming regions (Carlson+, 2012) J/MNRAS/452/3508 : Young stellar structures in NGC 6503 (Gouliermis+, 2015) J/MNRAS/454/839 : VMC survey. XVI. (Piatti+, 2015) J/MNRAS/449/639 : VMC survey. XIV. SFR in SMC (Rubele+, 2015) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq [1/123] Internal index number 5- 6 I2 --- sig [1/10] Significance level (see Figure 4) 8- 15 F8.4 deg RAdeg [28.8/320.5] Right Ascension (J2000) (1) 17- 24 F8.4 deg DEdeg [-82.5/-30] Declination (J2000) (1) 26- 30 F5.1 pc R [2.5/213] Size parameter (2) 32- 37 F6.1 --- N* [4.5/4419.2] Mass; expressed in N* (the number of upper main-sequence stars in a structure) 39- 42 F4.2 pc-2 SDen [0.01/0.5] Surface density (3)
Note (1): Of the center of each young stellar structure, defined as: (RAdeg|DEdeg)=((RAdeg|DEdeg)min+(RAdeg|DEdeg)max)/2, where (RAdeg|DEdeg)min and (RAdeg|DEdeg)max are the minimum and maximum Right Ascensions or Declinations of the iso-density contour of each structure, respectively. Note (2): The size of each young stellar structure, R, is estimated based on the radius of a circle that has the same area as that covered by the isodensity contour of the structure. See section 4.2 Note (3): Σ=N*/A where A is the area of the isodensity contour (see Section 4.1 and Figure 4). See section 4.4 for further explanations.
History: From electronic version of the journal References: Cioni et al. 2011Msngr.144...25C Cioni et al. Paper I 2011A&A...527A.116C Cat. II/351 Miszalski et al. Paper II 2011A&A...531A.157M Gullieuszik et al. Paper III 2012A&A...537A.105G Rubele et al. Paper IV 2012A&A...537A.106R Ripepi et al. Paper V 2012MNRAS.424.1807R Cat. J/MNRAS/424/1807 Cioni et al. Paper VI 2013A&A...549A..29C Cat. J/A+A/549/29 Tatton et al. Paper VII 2013A&A...554A..33T Cat. J/A+A/554/A33 Ripepi et al. Paper VIII 2014MNRAS.437.2307R Cat. J/MNRAS/437/2307 Cioni et al. Paper IX 2014A&A...562A..32C Moretti et al. Paper X 2014MNRAS.437.2702M Cat. J/MNRAS/437/2702 Li et al. Paper XI 2014ApJ...790...35L Piatti et al. Paper XII 2014A&A...570A..74P Ripepi et al. Paper XIII 2015MNRAS.446.3034R Cat. J/MNRAS/446/3034 Rubele et al. Paper XIV 2015MNRAS.449..639R Cat. J/MNRAS/449/639 Piatti et al. Paper XV 2015MNRAS.450..552P Piatti et al. Paper XVI 2015MNRAS.454..839P Cat. J/MNRAS/454/839 Cioni et al. Paper XVII 2016A&A...586A..77C Zhang et al. Paper XVIII 2015ApJ...815...95Z Ripepi et al. Paper XIX 2016ApJS..224...21R Cat. J/ApJS/224/21 Moretti et al. Paper XX 2016MNRAS.459.1687M Cat. J/MNRAS/459/1687 Piatti et al. Paper XXI 2016MNRAS.460..383P Sun et al. Paper XXII 2017ApJ...835..171S Marconi et al. Paper XXIII 2017MNRAS.466.3206M Subramanian et al. Paper XXIV 2017MNRAS.467.2980S Sun et al. Paper XXVII 2017ApJ...849..149S This catalog
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 18-Jun-2018
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