Stellar substructures in the periphery of the Magellanic Clouds with the VISTA hemisphere survey from the red clump and other tracers

Dalal El Youssoufi*, Maria-Rosa L. Cioni, Cameron P. M. Bell, Richard de Grijs, Martin A. T. Groenewegen, Valentin D. Ivanov, Gal Matijevič, Florian Niederhofer, Joana M. Oliveira, Vincenzo Ripepi, Thomas Schmidt, Smitha Subramanian, Ning-Chen Sun, Jacco Th van Loon

*Corresponding author for this work

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Abstract

We study the morphology of the stellar periphery of the Magellanic Clouds in search of substructure using near-infrared imaging data from the Visible and Infrared Survey Telescope for Astronomy Hemisphere Survey. Based on the selection of different stellar populations using the (J - Ks, Ks) colour-magnitude diagram, we confirm the presence of substructures related to the interaction history of the Clouds and find new substructures on the eastern side of the LMC disc, which may be owing to the influence of the Milky Way, and on the northern side of the SMC, which is probably associated with the ellipsoidal structure of the galaxy. We also study the luminosity function of red clump stars in the SMC and confirm the presence of a bi-modal distance distribution, in the form of a foreground population. We find that this bi-modality is still detectable in the eastern regions of the galaxy out to a 10° distance from its centre. Additionally, a background structure is detected in the North between 7° and 10° from the centre that might belong to the Counter Bridge, and a foreground structure is detected in the South between 6° and 8° from the centre that might be linked to the Old Bridge.

Original languageEnglish
Pages (from-to)2020-2038
Number of pages19
JournalMonthly Notices of the Royal Astronomical Society
Volume505
Issue number2
DOIs
Publication statusPublished - Aug 2021

Bibliographical note

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society, Volume 505, Issue 2, August 2021, Pages 2020–2038, https://doi.org/10.1093/mnras/stab1075. Copyright 2021 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

Keywords

  • galaxies: individual: interactions
  • galaxies: individual: Magellanic Clouds
  • galaxies: individual: photometry

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