TY  - JOUR
A1  - Sun, Ning-Chen
A1  - de Grijs, Richard
A1  - Subramanian, Smitha
A1  - Cioni, Maria-Rosa L.
A1  - Rubele, Stefano
A1  - Bekki, Kenji
A1  - Ivanov, Valentin D.
A1  - Piatti, Andrés E.
A1  - Ripepi, Vincenzo
T1  - The VMC Survey. XXII. Hierarchical star formation in the 30 Doradus-N158-N159-N160 star-forming complex
JF  - The astrophysical journal : an international review of spectroscopy and astronomical physics
N2  - We study the hierarchical stellar structures in a similar to 1.5 deg(2) area covering the 30. Doradus-N158-N159-N160 starforming complex with the VISTA Survey of. Magellanic Clouds. Based on the young upper main-sequence stars, we find that the surface densities cover a wide range of values, from log(Sigma.pc(2))less than or similar to -2.0 to log(Sigma. pc(2)) greater than or similar to 0.0. Their distributions are highly non-uniform, showing groups that frequently have subgroups inside. The sizes of the stellar groups do not exhibit characteristic values, and range continuously from several parsecs to more than 100. pc; the cumulative size distribution can be well described by a single power law, with the power-law index indicating a projected fractal dimension D-2 = 1.6 +/- 0.3. We suggest that the phenomena revealed here support a scenario of hierarchical star formation. Comparisons with other star-forming regions and galaxies are also discussed.
KW  - galaxies: clusters: general
KW  - infrared: stars
KW  - Magellanic Clouds
KW  - stars: formation
Y1  - 2017
U6  - https://doi.org/10.3847/1538-4357/835/2/171
SN  - 0004-637X
SN  - 1538-4357
VL  - 835
IS  - 2
PB  - Institute of Physics Publ.
CY  - Bristol
ER  - 
TY  - JOUR
A1  - Subramanian, Smitha
A1  - Rubele, Stefano
A1  - Sun, Ning-Chen
A1  - Girardi, Leo
A1  - de Grijs, Richard
A1  - van Loon, Jacco Th.
A1  - Cioni, Maria-Rosa L.
A1  - Piatti, Andres E.
A1  - Bekki, Kenji
A1  - Emerson, Jim
A1  - Ivanov, Valentin D.
A1  - Kerber, Leandro
A1  - Marconi, Marcella
A1  - Ripepi, Vincenzo
A1  - Tatton, Benjamin L.
T1  - The VMC Survey - XXIV. Signatures of tidally stripped stellar populations from the inner Small Magellanic Cloud
JF  - Monthly notices of the Royal Astronomical Society
KW  - stars: individual: red clump stars
KW  - galaxies: interactions
KW  - Magellanic Clouds
Y1  - 2017
U6  - https://doi.org/10.1093/mnras/stx205
SN  - 0035-8711
SN  - 1365-2966
VL  - 467
SP  - 2980
EP  - 2995
PB  - Oxford Univ. Press
CY  - Oxford
ER  - 
TY  - JOUR
A1  - Sun, Ning-Chen
A1  - de Grijs, Richard
A1  - Subramanian, Smitha
A1  - Bekki, Kenji
A1  - Bell, Cameron P. M.
A1  - Cioni, Maria-Rosa L.
A1  - Ivanov, Valentin D.
A1  - Marconi, Marcella
A1  - Oliveira, Joana M.
A1  - Piatti, Andres E.
A1  - Ripepi, Vincenzo
A1  - Rubele, Stefano
A1  - Tatton, Ben L.
A1  - van Loon, Jacco Th.
T1  - The VMC Survey. XXII. Hierarchical Star Formation in the 30 Doradus-N158–N159–N160 Star-forming Complex
JF  - The astrophysical journal : an international review of spectroscopy and astronomical physics
N2  - 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(tau/yr) = 7.2, contains the most substructure, progressively older ones are less and less substructured. The oldest subsample, with a median age of log(tau/yr) = 8.0, is almost indistinguishable from a uniform distribution on spatial scales of 30-300. pc, suggesting that the young stellar structures are completely dispersed on a timescale of similar to 100. Myr. 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.
KW  - infrared: stars
KW  - Magellanic Clouds
KW  - stars: formation
Y1  - 2017
U6  - https://doi.org/10.3847/1538-4357/aa911e
SN  - 0004-637X
SN  - 1538-4357
VL  - 849
PB  - IOP Publ. Ltd.
CY  - Bristol
ER  -