The Magellanic Edges Survey IV. Complex tidal debris in the SMC outskirts

Abstract

We use data from the Magellanic Edges Survey (MagES) in combination with Gaia EDR3 to study the extreme southern outskirts of the Small Magellanic Cloud (SMC), focussing on a field at the eastern end of a long arm-like structure which wraps around the southern periphery of the Large Magellanic Cloud (LMC). Unlike the remainder of this structure, which is thought to be comprised of perturbed LMC disk material, the aggregate properties of the field indicate a clear connection with the SMC. We find evidence for two stellar populations in the field: one having properties consistent with the outskirts of the main SMC body, and the other significantly perturbed. The perturbed population is on average ~0.2 dex more metal-rich, and is located ~7 kpc in front of the dominant population with a total space velocity relative to the SMC centre of ~230 km/s broadly in the direction of the LMC. We speculate on possible origins for this perturbed population, the most plausible of which is that it comprises debris from the inner SMC that has been recently tidally stripped by interactions with the LMC.

arXiv comment5 pages, 4 figures; Accepted by MNRAS

References in corpus (32)

• PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
• The Universal Stellar Mass-Stellar Metallicity Relation for Dwarf Galaxies
• A distance to the Large Magellanic Cloud that is precise to one per cent
• Gaia Data Release 2: Kinematics of globular clusters and dwarf galaxies around the Milky Way
• The Role of Dwarf Galaxy Interactions in Shaping the Magellanic System and Implications for Magellanic Irregulars
• The Anglo-Australian Observatory's 2dF Facility
• The VMC Survey - I. Strategy and First Data
• Population effects on the Red Giant Clump absolute magnitude, and distance determinations to nearby galaxies
• Third-Epoch Magellanic Cloud Proper Motions II: The Large Magellanic Cloud Rotation Field in Three Dimensions
• A distance determination to the Small Magellanic Cloud with an accuracy of better than 2 percent based on late-type eclipsing binary stars
• The Carnegie Hubble Program: The Distance and Structure of the SMC as Revealed by Mid-infrared Observations of Cepheids
• SMASH - Survey of the MAgellanic Stellar History
• The metallicity gradient as a tracer of history and structure: the Magellanic Clouds and M33 galaxies
• The Proper Motion Field of the Small Magellanic Cloud: Kinematic Evidence for its Tidal Disruption
• Clouds, Streams and Bridges. Redrawing the blueprint of the Magellanic System with Gaia DR1
• A Tidally-Stripped Stellar Component of the Magellanic Bridge
• Revealing the tidal scars of the Small Magellanic Cloud
• Optimal Extraction of Fibre Optic Spectroscopy
• Red Giants in the Small Magellanic Cloud. II. Metallicity Gradient and Age-Metallicity Relation
• Substructures and tidal distortions in the Magellanic stellar periphery
• The recent LMC-SMC collision: Timing and impact parameter constraints from comparison of Gaia LMC disk kinematics and N-body simulations
• Models of Tidally Induced Gas Filaments in the Magellanic Stream
• Clouds in Arms
• The VMC Survey - XXIV. Signatures of tidally stripped stellar populations from the inner Small Magellanic Cloud
• Magellanic Mayhem: Metallicities and Motions
• Stellar substructures in the periphery of the Magellanic Clouds with the VISTA Hemisphere Survey from the red clump and other tracers
• Gaia view of a stellar sub-structure in front of the Small Magellanic Cloud
• The Magellanic Edges Survey I. Description and First Results
• Deciphering the Kinematic Structure of the Small Magellanic Cloud through its Red Giant Population
• The Magellanic Edges Survey III. Kinematics of the disturbed LMC outskirts
• Presence of red giant population in the foreground stellar sub-structure of the Small Magellanic Cloud
• Kinematical Analysis of Substructure in the Southern Periphery of the Large Magellanic Cloud

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• UVIT Study of the MAgellanic Clouds (U-SMAC) II. A Far-UV catalog of the Small Magellanic Cloud: Morphology and Kinematics of young stellar population
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• The red giant branch tip in the SDSS, PS1, JWST, NGRST and Euclid photometric systems. Calibration in optical passbands using Gaia DR3 synthetic photometry
• The 3D kinematics of stellar substructures in the periphery of the Large Magellanic Cloud
• The orbital dynamics of the LMC and SMC about the Milky Way