The VMC Survey – XL. Three-dimensional structure of the Small Magellanic Cloud as derived from red clump stars

B. L. Tatton*, J. Th van Loon, M-R L. Cioni, K. Bekki, C. P. M. Bell, S. Choudhury, R. de Grijs, M. A. T. Groenewegen, V. D. Ivanov, M. Marconi, J. M. Oliveira, V. Ripepi, S. Rubele, S. Subramanian, N-C Sun

*Corresponding author for this work

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Abstract

Galaxy interactions distort the distribution of baryonic matter and can affect star formation. The nearby Magellanic Clouds are a prime example of an ongoing galaxy interaction process. Here, we use the intermediate-age (∼1–10 Gyr) red clump (RC) stars to map the 3D structure of the Small Magellanic Cloud (SMC) and interpret it within the context of its history of interaction with the Large Magellanic Cloud (LMC) and the Milky Way. RC stars are selected from near-infrared colour–magnitude diagrams based on data from the Visible and Infrared Survey Telescope for Astronomy survey of the Magellanic Clouds. Interstellar reddening is measured and removed, and the corrected brightness is converted to a distance, on a star-by-star basis. A flat plane fitted to the spatial distribution of RC stars has an inclination i = 35–48 and position angle, PA=170–186. However, significant deviations from this plane are seen, especially in the periphery and on the eastern side of the SMC. In the latter part, two distinct populations are present, separated in distance by as much as 10 kpc. Distant RC stars are seen in the north of the SMC, and possibly also in the far west; these might be associated with the predicted ‘Counter-Bridge’. We also present a dust reddening map, which shows that dust generally traces stellar mass. The structure of the intermediate-age stellar component of the SMC bears the imprints of strong interaction with the LMC a few Gyr ago, which cannot be purely tidal but must have involved ram pressure stripping.
Original languageEnglish
Pages (from-to)2983-2997
Number of pages15
JournalMonthly Notices of the Royal Astronomical Society
Volume504
Issue number2
DOIs
Publication statusPublished - Jun 2021

Bibliographical note

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society, Volume 504, Issue 2, June 2021, Pages 2983–2997, https://doi.org/10.1093/mnras/staa3857. Copyright 2021 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

Keywords

  • galaxies: interactions
  • galaxies: ISM
  • Magellanic Clouds
  • galaxies: stellar content
  • galaxies: structure
  • infrared: stars

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