Sun, N-C and Grijs, RD and Cioni, M-RL and Rubele, S and Subramanian, S and Loon, JTV and Bekki, K and Bell, CPM and Ivanov, VD and Marconi, M and Muraveva, T and Oliveira, JM and Ripepi, V (2018) The VMC Survey. XXIX. Turbulence-controlled Hierarchical Star Formation in the Small Magellanic Cloud. Astrophysical Journal, 858 (1). ISSN 0004-637X

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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 YJK s 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.

Item Type: Article
Additional Information: © 2018 IOP Science, American Astronomical Society. This is the final published version of the article (version of record). It first appeared online via IOP Science, American Astronomical Society at https://doi.org/10.3847/1538-4357/aabc50 - please refer to any applicable terms of use of the publisher.
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Depositing User: Symplectic
Date Deposited: 16 May 2018 15:14
Last Modified: 16 May 2018 15:17
URI: http://eprints.keele.ac.uk/id/eprint/4912

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