2017MNRAS.472.2975M -
Mon. Not. R. Astron. Soc., 472, 2975-2989 (2017/December-2)
Structured star formation in the Magellanic inter-Cloud region.
MACKEY A.D., KOPOSOV S.E., DA COSTA G.S., BELOKUROV V., ERKAL D., FRATERNALI F., McCLURE-GRIFFITHS N.M. and FRASER M.
Abstract (from CDS):
We use a new contiguous imaging survey conducted using the Dark Energy Camera to investigate the distribution and properties of young stellar populations in the Magellanic inter-Cloud region. These young stars are strongly spatially clustered, forming a narrow chain of low-mass associations that trace the densest H I gas in the Magellanic Bridge and extend, in projection, from the SMC to the outer disc of the LMC. The associations in our survey footprint have ages <= 30 Myr, masses in the range ∼100-1200 M☉ and very diffuse structures with half-light radii of up to ∼100 pc. The two most populous are strongly elliptical and aligned to ≃10°, with the axis joining the centres of the LMC and the SMC. These observations strongly suggest that the young inter-Cloud populations formed in situ, likely due to the compression of gas stripped during the most recent close LMC-SMC encounter. The associations lie at distances intermediate between the two Clouds, and we find no evidence for a substantial distance gradient across the imaged area. Finally, we identify a vast shell of young stars surrounding a central association, that is spatially coincident with a low column density bubble in the H I distribution. The properties of this structure are consistent with a scenario where stellar winds and supernova explosions from massive stars in the central cluster swept up the ambient gas into a shell, triggering a new burst of star formation. This is a prime location for studying stellar feedback in a relatively isolated environment.
Abstract Copyright:
© 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
Journal keyword(s):
galaxies: interactions - galaxies: ISM - Magellanic Clouds - galaxies: star formation - galaxies: structure - galaxies: structure
Nomenclature:
Fig. 3, Tables 1-2: [MKD2017] ICA 72a (Nos 72a-72b).
Simbad objects:
17
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