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

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

Stellar substructures in the periphery of the magellanic clouds with the VISTA hemisphere survey from the red clump and other tracers Thumbnail


Authors

Dalal El Youssoufi

Maria-Rosa L Cioni

Cameron P M Bell

Richard de Grijs

Martin A T Groenewegen

Valentin D Ivanov

Gal Matijevĭc

Florian Niederhofer

Vincenzo Ripepi

Thomas Schmidt

Smitha Subramanian

Ning-Chen Sun



Abstract

We study the morphology of the stellar periphery of the Magellanic Clouds in search of substructure using near–infrared imaging data from the VISTA Hemisphere Survey (VHS). 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 to 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 which might belong to the Counter Bridge, and a foreground structure is detected in the South between 6? and 8? from the centre which might be linked to the Old Bridge.

Journal Article Type Article
Acceptance Date Apr 12, 2021
Online Publication Date Apr 19, 2021
Publication Date 2021-08
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 505
Issue 2
Pages 2020-2038
DOI https://doi.org/10.1093/mnras/stab1075
Keywords Magellanic Clouds, galaxies, photometry, interactions, stellar content
Publisher URL https://doi.org/10.1093/mnras/stab1075

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