The VMC survey: XLV. Proper motion of the outer LMC and the impact of the SMC

Thomas Schmidt; Maria-Rosa L. Cioni; Florian Niederhofer; Kenji Bekki; Cameron P. M. Bell; Richard de Grijs; Dalal El Youssoufi; Valentin D. Ivanov; Joana M. Oliveira; Vincenzo Ripepi; Jacco Th van Loon

doi:10.1051/0004-6361/202142148

The VMC survey: XLV. Proper motion of the outer LMC and the impact of the SMC

Thomas Schmidt^*, Maria-Rosa L. Cioni, Florian Niederhofer, Kenji Bekki, Cameron P. M. Bell, Richard de Grijs, Dalal El Youssoufi, Valentin D. Ivanov, Joana M. Oliveira, Vincenzo Ripepi, Jacco Th van Loon

^*Corresponding author for this work

School of Mathematical and Physical Sciences

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

Context. The Large Magellanic Cloud (LMC) is the most luminous satellite galaxy of the Milky Way and, owing to its companion, the Small Magellanic Cloud (SMC), represents an excellent laboratory to study the interaction of dwarf galaxies.

Aims. The aim of this study is to investigate the kinematics of the outer regions of the LMC by using stellar proper motions to understand the impact of interactions, for example with the SMC about 250 Myr ago.

Methods. We calculate proper motions using multi-epoch Ks-band images from the VISTA survey of the Magellanic Cloud system (VMC). Observations span a time baseline of 2- 5 yr. We combine the VMC data with data from the Gaia Early Data Release 3 and introduce a new method to distinguish between Magellanic and Milky Way stars based on a machine learning algorithm. This new technique enables a larger and cleaner sample selection of fainter sources as it reaches below the red clump of the LMC.

Results. We investigate the impact of the SMC on the rotational field of the LMC and find hints of stripped SMC debris. The south-eastern region of the LMC shows a slow rotational speed compared to the overall rotation. N-body simulations suggest that this could be caused by a fraction of stripped SMC stars located in that particular region that move opposite to the expected rotation.

Original language	English
Article number	A107
Pages (from-to)	1-21
Number of pages	21
Journal	Astronomy and Astrophysics
Volume	663
DOIs	https://doi.org/10.1051/0004-6361/202142148
Publication status	Published - 1 Jul 2022

Keywords

Galaxies: interactions
Galaxy: kinematics and dynamics
Magellanic Clouds
Proper motions
Surveys

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10.1051/0004-6361/202142148

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title = "The VMC survey: XLV. Proper motion of the outer LMC and the impact of the SMC",

abstract = "Context. The Large Magellanic Cloud (LMC) is the most luminous satellite galaxy of the Milky Way and, owing to its companion, the Small Magellanic Cloud (SMC), represents an excellent laboratory to study the interaction of dwarf galaxies.Aims. The aim of this study is to investigate the kinematics of the outer regions of the LMC by using stellar proper motions to understand the impact of interactions, for example with the SMC about 250 Myr ago.Methods. We calculate proper motions using multi-epoch Ks-band images from the VISTA survey of the Magellanic Cloud system (VMC). Observations span a time baseline of 2- 5 yr. We combine the VMC data with data from the Gaia Early Data Release 3 and introduce a new method to distinguish between Magellanic and Milky Way stars based on a machine learning algorithm. This new technique enables a larger and cleaner sample selection of fainter sources as it reaches below the red clump of the LMC.Results. We investigate the impact of the SMC on the rotational field of the LMC and find hints of stripped SMC debris. The south-eastern region of the LMC shows a slow rotational speed compared to the overall rotation. N-body simulations suggest that this could be caused by a fraction of stripped SMC stars located in that particular region that move opposite to the expected rotation. ",

keywords = "Galaxies: interactions, Galaxy: kinematics and dynamics, Magellanic Clouds, Proper motions, Surveys",

author = "Thomas Schmidt and Cioni, {Maria-Rosa L.} and Florian Niederhofer and Kenji Bekki and Bell, {Cameron P. M.} and {de Grijs}, Richard and {El Youssoufi}, Dalal and Ivanov, {Valentin D.} and Oliveira, {Joana M.} and Vincenzo Ripepi and {van Loon}, {Jacco Th}",

year = "2022",

month = jul,

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doi = "10.1051/0004-6361/202142148",

language = "English",

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TY - JOUR

T1 - The VMC survey

T2 - XLV. Proper motion of the outer LMC and the impact of the SMC

AU - Schmidt, Thomas

AU - Cioni, Maria-Rosa L.

AU - Niederhofer, Florian

AU - Bekki, Kenji

AU - Bell, Cameron P. M.

AU - de Grijs, Richard

AU - El Youssoufi, Dalal

AU - Ivanov, Valentin D.

AU - Oliveira, Joana M.

AU - Ripepi, Vincenzo

AU - van Loon, Jacco Th

PY - 2022/7/1

Y1 - 2022/7/1

N2 - Context. The Large Magellanic Cloud (LMC) is the most luminous satellite galaxy of the Milky Way and, owing to its companion, the Small Magellanic Cloud (SMC), represents an excellent laboratory to study the interaction of dwarf galaxies.Aims. The aim of this study is to investigate the kinematics of the outer regions of the LMC by using stellar proper motions to understand the impact of interactions, for example with the SMC about 250 Myr ago.Methods. We calculate proper motions using multi-epoch Ks-band images from the VISTA survey of the Magellanic Cloud system (VMC). Observations span a time baseline of 2- 5 yr. We combine the VMC data with data from the Gaia Early Data Release 3 and introduce a new method to distinguish between Magellanic and Milky Way stars based on a machine learning algorithm. This new technique enables a larger and cleaner sample selection of fainter sources as it reaches below the red clump of the LMC.Results. We investigate the impact of the SMC on the rotational field of the LMC and find hints of stripped SMC debris. The south-eastern region of the LMC shows a slow rotational speed compared to the overall rotation. N-body simulations suggest that this could be caused by a fraction of stripped SMC stars located in that particular region that move opposite to the expected rotation.

AB - Context. The Large Magellanic Cloud (LMC) is the most luminous satellite galaxy of the Milky Way and, owing to its companion, the Small Magellanic Cloud (SMC), represents an excellent laboratory to study the interaction of dwarf galaxies.Aims. The aim of this study is to investigate the kinematics of the outer regions of the LMC by using stellar proper motions to understand the impact of interactions, for example with the SMC about 250 Myr ago.Methods. We calculate proper motions using multi-epoch Ks-band images from the VISTA survey of the Magellanic Cloud system (VMC). Observations span a time baseline of 2- 5 yr. We combine the VMC data with data from the Gaia Early Data Release 3 and introduce a new method to distinguish between Magellanic and Milky Way stars based on a machine learning algorithm. This new technique enables a larger and cleaner sample selection of fainter sources as it reaches below the red clump of the LMC.Results. We investigate the impact of the SMC on the rotational field of the LMC and find hints of stripped SMC debris. The south-eastern region of the LMC shows a slow rotational speed compared to the overall rotation. N-body simulations suggest that this could be caused by a fraction of stripped SMC stars located in that particular region that move opposite to the expected rotation.

KW - Galaxies: interactions

KW - Galaxy: kinematics and dynamics

KW - Magellanic Clouds

KW - Proper motions

KW - Surveys

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M1 - A107

ER -

The VMC survey: XLV. Proper motion of the outer LMC and the impact of the SMC

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Keywords

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