The VMC survey – XXXIV. Morphology of stellar populations in the Magellanic Clouds

Dalal El Youssoufi, Maria Rosa L. Cioni, Cameron P.M. Bell, Stefano Rubele, Kenji Bekki, Richard De Grijs, Léo Girardi, Valentin D. Ivanov, Gal Matijevic, Florian Niederhofer, Joana M. Oliveira, Vincenzo Ripepi, Smitha Subramanian, Jacco Th Van Loon

Research output: Contribution to journalReview article

24 Downloads (Pure)

Abstract

The Magellanic Clouds are nearby dwarf irregular galaxies whose morphologies show different properties when traced by different stellar populations, making them an important laboratory for studying galaxy morphologies. We study the morphology of the Magellanic Clouds using data from the Visible and Infrared Survey Telescope for Astronomy survey of the Magellanic Clouds system. We used about 10 and 2.5 million sources across an area of -105 and -42 deg2 towards the Large and Small Magellanic Cloud (LMC and SMC), respectively. We estimated median ages of stellar populations occupying different regions of the near-infrared (J − Ks, Ks) colour–magnitude diagram. Morphological maps were produced and detailed features in the central regions were characterized for the first time with bins corresponding to a spatial resolution of 0.13 kpc (LMC) and 0.16 kpc (SMC). In the LMC, we find that main-sequence stars show coherent structures that grow with age and trace the multiple spiral arms of the galaxy, star-forming regions become dimmer as we progress in age, while supergiant stars are centrally concentrated. Intermediate-age stars, despite tracing a regular and symmetrical morphology, show central clumps and hints of spiral arms. In the SMC, young main-sequence stars depict a broken bar. Intermediate-age populations show signatures of elongation towards the Magellanic Bridge that can be attributed to the LMC–SMC interaction -200 Myr ago. They also show irregular central features suggesting that the inner SMC has also been influenced by tidal interactions.

Original languageEnglish
Pages (from-to)1076-1093
Number of pages18
JournalMonthly Notices of the Royal Astronomical Society
Volume490
Issue number1
DOIs
Publication statusPublished - 1 Jan 2019

Fingerprint

Magellanic clouds
main sequence stars
supergiant stars
galaxies
irregular galaxies
stars
clumps
dwarf galaxies
tracing
astronomy
elongation
spatial resolution
diagrams
signatures
interactions
telescopes
near infrared
diagram

Cite this

El Youssoufi, D., Cioni, M. R. L., Bell, C. P. M., Rubele, S., Bekki, K., De Grijs, R., ... Van Loon, J. T. (2019). The VMC survey – XXXIV. Morphology of stellar populations in the Magellanic Clouds. Monthly Notices of the Royal Astronomical Society, 490(1), 1076-1093. https://doi.org/10.1093/mnras/stz2400
El Youssoufi, Dalal ; Cioni, Maria Rosa L. ; Bell, Cameron P.M. ; Rubele, Stefano ; Bekki, Kenji ; De Grijs, Richard ; Girardi, Léo ; Ivanov, Valentin D. ; Matijevic, Gal ; Niederhofer, Florian ; Oliveira, Joana M. ; Ripepi, Vincenzo ; Subramanian, Smitha ; Van Loon, Jacco Th. / The VMC survey – XXXIV. Morphology of stellar populations in the Magellanic Clouds. In: Monthly Notices of the Royal Astronomical Society. 2019 ; Vol. 490, No. 1. pp. 1076-1093.
@article{03ef7e65fd964f929f278e192dea3af3,
title = "The VMC survey – XXXIV. Morphology of stellar populations in the Magellanic Clouds",
abstract = "The Magellanic Clouds are nearby dwarf irregular galaxies whose morphologies show different properties when traced by different stellar populations, making them an important laboratory for studying galaxy morphologies. We study the morphology of the Magellanic Clouds using data from the Visible and Infrared Survey Telescope for Astronomy survey of the Magellanic Clouds system. We used about 10 and 2.5 million sources across an area of -105 and -42 deg2 towards the Large and Small Magellanic Cloud (LMC and SMC), respectively. We estimated median ages of stellar populations occupying different regions of the near-infrared (J − Ks, Ks) colour–magnitude diagram. Morphological maps were produced and detailed features in the central regions were characterized for the first time with bins corresponding to a spatial resolution of 0.13 kpc (LMC) and 0.16 kpc (SMC). In the LMC, we find that main-sequence stars show coherent structures that grow with age and trace the multiple spiral arms of the galaxy, star-forming regions become dimmer as we progress in age, while supergiant stars are centrally concentrated. Intermediate-age stars, despite tracing a regular and symmetrical morphology, show central clumps and hints of spiral arms. In the SMC, young main-sequence stars depict a broken bar. Intermediate-age populations show signatures of elongation towards the Magellanic Bridge that can be attributed to the LMC–SMC interaction -200 Myr ago. They also show irregular central features suggesting that the inner SMC has also been influenced by tidal interactions.",
keywords = "Galaxies: interactions, Galaxies: photometry, Galaxies: stellar content, Magellanic Clouds",
author = "{El Youssoufi}, Dalal and Cioni, {Maria Rosa L.} and Bell, {Cameron P.M.} and Stefano Rubele and Kenji Bekki and {De Grijs}, Richard and L{\'e}o Girardi and Ivanov, {Valentin D.} and Gal Matijevic and Florian Niederhofer and Oliveira, {Joana M.} and Vincenzo Ripepi and Smitha Subramanian and {Van Loon}, {Jacco Th}",
year = "2019",
month = "1",
day = "1",
doi = "10.1093/mnras/stz2400",
language = "English",
volume = "490",
pages = "1076--1093",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "OXFORD UNIV PRESS UNITED KINGDOM",
number = "1",

}

El Youssoufi, D, Cioni, MRL, Bell, CPM, Rubele, S, Bekki, K, De Grijs, R, Girardi, L, Ivanov, VD, Matijevic, G, Niederhofer, F, Oliveira, JM, Ripepi, V, Subramanian, S & Van Loon, JT 2019, 'The VMC survey – XXXIV. Morphology of stellar populations in the Magellanic Clouds' Monthly Notices of the Royal Astronomical Society, vol. 490, no. 1, pp. 1076-1093. https://doi.org/10.1093/mnras/stz2400

The VMC survey – XXXIV. Morphology of stellar populations in the Magellanic Clouds. / El Youssoufi, Dalal; Cioni, Maria Rosa L.; Bell, Cameron P.M.; Rubele, Stefano; Bekki, Kenji; De Grijs, Richard; Girardi, Léo; Ivanov, Valentin D.; Matijevic, Gal; Niederhofer, Florian; Oliveira, Joana M.; Ripepi, Vincenzo; Subramanian, Smitha; Van Loon, Jacco Th.

In: Monthly Notices of the Royal Astronomical Society, Vol. 490, No. 1, 01.01.2019, p. 1076-1093.

Research output: Contribution to journalReview article

TY - JOUR

T1 - The VMC survey – XXXIV. Morphology of stellar populations in the Magellanic Clouds

AU - El Youssoufi, Dalal

AU - Cioni, Maria Rosa L.

AU - Bell, Cameron P.M.

AU - Rubele, Stefano

AU - Bekki, Kenji

AU - De Grijs, Richard

AU - Girardi, Léo

AU - Ivanov, Valentin D.

AU - Matijevic, Gal

AU - Niederhofer, Florian

AU - Oliveira, Joana M.

AU - Ripepi, Vincenzo

AU - Subramanian, Smitha

AU - Van Loon, Jacco Th

PY - 2019/1/1

Y1 - 2019/1/1

N2 - The Magellanic Clouds are nearby dwarf irregular galaxies whose morphologies show different properties when traced by different stellar populations, making them an important laboratory for studying galaxy morphologies. We study the morphology of the Magellanic Clouds using data from the Visible and Infrared Survey Telescope for Astronomy survey of the Magellanic Clouds system. We used about 10 and 2.5 million sources across an area of -105 and -42 deg2 towards the Large and Small Magellanic Cloud (LMC and SMC), respectively. We estimated median ages of stellar populations occupying different regions of the near-infrared (J − Ks, Ks) colour–magnitude diagram. Morphological maps were produced and detailed features in the central regions were characterized for the first time with bins corresponding to a spatial resolution of 0.13 kpc (LMC) and 0.16 kpc (SMC). In the LMC, we find that main-sequence stars show coherent structures that grow with age and trace the multiple spiral arms of the galaxy, star-forming regions become dimmer as we progress in age, while supergiant stars are centrally concentrated. Intermediate-age stars, despite tracing a regular and symmetrical morphology, show central clumps and hints of spiral arms. In the SMC, young main-sequence stars depict a broken bar. Intermediate-age populations show signatures of elongation towards the Magellanic Bridge that can be attributed to the LMC–SMC interaction -200 Myr ago. They also show irregular central features suggesting that the inner SMC has also been influenced by tidal interactions.

AB - The Magellanic Clouds are nearby dwarf irregular galaxies whose morphologies show different properties when traced by different stellar populations, making them an important laboratory for studying galaxy morphologies. We study the morphology of the Magellanic Clouds using data from the Visible and Infrared Survey Telescope for Astronomy survey of the Magellanic Clouds system. We used about 10 and 2.5 million sources across an area of -105 and -42 deg2 towards the Large and Small Magellanic Cloud (LMC and SMC), respectively. We estimated median ages of stellar populations occupying different regions of the near-infrared (J − Ks, Ks) colour–magnitude diagram. Morphological maps were produced and detailed features in the central regions were characterized for the first time with bins corresponding to a spatial resolution of 0.13 kpc (LMC) and 0.16 kpc (SMC). In the LMC, we find that main-sequence stars show coherent structures that grow with age and trace the multiple spiral arms of the galaxy, star-forming regions become dimmer as we progress in age, while supergiant stars are centrally concentrated. Intermediate-age stars, despite tracing a regular and symmetrical morphology, show central clumps and hints of spiral arms. In the SMC, young main-sequence stars depict a broken bar. Intermediate-age populations show signatures of elongation towards the Magellanic Bridge that can be attributed to the LMC–SMC interaction -200 Myr ago. They also show irregular central features suggesting that the inner SMC has also been influenced by tidal interactions.

KW - Galaxies: interactions

KW - Galaxies: photometry

KW - Galaxies: stellar content

KW - Magellanic Clouds

UR - http://www.scopus.com/inward/record.url?scp=85075233549&partnerID=8YFLogxK

U2 - 10.1093/mnras/stz2400

DO - 10.1093/mnras/stz2400

M3 - Review article

VL - 490

SP - 1076

EP - 1093

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 1

ER -