The VMC survey -- XXXIX: Mapping metallicity trends in the Small Magellanic Cloud using near-infrared passbands

Abstract

We have derived high spatial resolution metallicity maps covering $\sim$42 deg${}^2$ across the Small Magellanic Cloud (SMC) in an attempt to understand its metallicity distribution and gradients up to a radius of $\sim$ 4${}^{\circ }$. Using the near-infrared VISTA Survey of the Magellanic Clouds, our data cover a thrice larger area compared with previous studies. We identify red giant branch (RGB) stars in spatially distinct $Y,(Y-K_{\mathrm{s}})$ colour--magnitude diagrams. In any of our selected subregions, the RGB slope is used as an indicator of the average metallicity, based on calibration to metallicity using spectroscopic data. The metallicity distribution across the SMC is unimodal and can be fitted by a Gaussian distribution with a peak at [Fe/H] = $-$0.97 dex ($\sigma$[Fe/H] = 0.05 dex). We find evidence of a shallow gradient in metallicity ($-0.031\pm 0.005$ dex deg${}^{-1}$) from the galactic centre to radii of 2${}^{\circ }$--2.5${}^{\circ }$, followed by a flat metallicity trend from $\sim$ 3.5${}^{\circ }$ to 4${}^{\circ }$. We find that the SMC's metallicity gradient is radially asymmetric. It is flatter towards the East than to the West, hinting at mixing and/or distortion of the spatial metallicity distribution (within the inner 3${}^{\circ }$), presumably caused by tidal interactions between the Magellanic Clouds.

arXiv comment16 pages, 15 figures, 1 table, Accepted for publication in MNRAS on 15 Jul 2020

References in corpus (80)

• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
• The Apache Point Observatory Galactic Evolution Experiment (APOGEE)
• Third-Epoch Magellanic Cloud Proper Motions I: HST/WFC3 data and Orbit Implications
• The Magellanic Clouds Photometric Survey: The Large Magellanic Cloud Stellar Catalog and Extinction Map
• The Star Formation History of the Small Magellanic Cloud
• The Magellanic Clouds Photometric Survey: The Small Magellanic Cloud Stellar Catalog and Extinction Map
• The Role of Dwarf Galaxy Interactions in Shaping the Magellanic System and Implications for Magellanic Irregulars
• The VMC Survey - I. Strategy and First Data
• The Proper Motion of the Large Magellanic Cloud using HST
• Is the SMC Bound to the LMC? The HST Proper Motion of the SMC
• Simulations of the Magellanic Stream in a First Infall Scenario
• Metallicity Gradients and Gas Flows in Galaxy Pairs
• Metallicity gradients in local field star-forming galaxies: Insights on inflows, outflows, and the coevolution of gas, stars and metals
• The Visible and Infrared Survey Telescope for Astronomy (VISTA): Design, Technical Overview and Performance
• The VISTA Science Archive
• Clustering of Local Group distances: publication bias or correlated measurements? I. The Large Magellanic Cloud
• The Tidal Origin of the Magellanic Stream and the Possibility of a Stellar Counterpart
• New Optical Reddening Maps of the Large and Small Magellanic Clouds
• Ca II Triplet Spectroscopy of Giants in SMC Star Clusters: Abundances, Velocities and the Age-Metallicity Relation
• Spectroscopy of Red Giants in the LMC Bar: Abundances, Kinematics, and the Age-Metallicity Relation
• Formation and evolution of the Magellanic Clouds. I.Origin of structural, kinematical, and chemical properties of the Large Magellanic Cloud
• Calcium II Triplet Spectroscopy of LMC Red Giants. I. Abundances and Velocities for a Sample of Populous Clusters
• Chemical abundances in LMC stellar populations I. The Inner disk sample Based on observations collected at the VLT UT2 telescope
• A Population of Accreted SMC Stars in the LMC
• The Chemical Enrichment History of the Large Magellanic Cloud
• Clustering of Local Group distances: publication bias or correlated measurements? III. The Small Magellanic Cloud
• The Chemical Enrichment History of the Small Magellanic Cloud and Its Gradients
• The Line-of-Sight Depth of Populous Clusters in the Small Magellanic Cloud
• The metallicity gradient as a tracer of history and structure: the Magellanic Clouds and M33 galaxies
• The 3D structure of the Small Magellanic Cloud
• Depth estimation of the Large and Small Magellanic Clouds
• The VMC Survey - XIV. First results on the look-back time star-formation rate tomography of the Small Magellanic Cloud
• The Lazy Giants: APOGEE Abundances Reveal Low Star Formation Efficiencies in the Magellanic Clouds
• The VMC survey - XXXI. The spatially resolved star formation history of the main body of the Small Magellanic Cloud
• Old Stellar Populations of the Small Magellanic Cloud
• Three dimensional maps of the Magellanic Clouds using RR Lyrae Stars and Cepheids II. The Small Magellanic Cloud
• A Tidally-Stripped Stellar Component of the Magellanic Bridge
• A 10 kpc stellar substructure at the edge of the Large Magellanic Cloud: perturbed outer disk or evidence for tidal stripping?
• Imprints of radial migration on the Milky Way's metallicity distribution functions
• The VMC survey - XXVI. Structure of the Small Magellanic Cloud from RR Lyrae stars
• Ca II Triplet Spectroscopy of Small Magellanic Cloud Red Giants. I. Abundances and Velocities for a Sample of Clusters
• Constraining the orbital history of the Magellanic Clouds: A new bound scenario suggested by the tidal origin of the Magellanic Stream
• Photometric metallicity map of the Large Magellanic Cloud
• Mean age gradient and asymmetry in the star formation history of the Small Magellanic Cloud
• An estimate of the structural parameters of the Large Magellanic Cloud using red clump stars
• Red Giants in the Small Magellanic Cloud. I. Disk and Tidal Stream Kinematics
• Red Giants in the Small Magellanic Cloud. II. Metallicity Gradient and Age-Metallicity Relation
• Empirical calibration of the reddening maps in the Magellanic Clouds
• Toward a Complete Understanding of the Magellanic Stream Formation
• Photometric metallicity map of the Small Magellanic Cloud
• Ca II Triplet Spectroscopy of Small Magellanic Cloud Red Giants. III. Abundances and Velocities for a Sample of 14 Clusters
• The detection of an older population in the Magellanic Bridge
• The VMC Survey - XXIV. Signatures of tidally stripped stellar populations from the inner Small Magellanic Cloud
• OGLE-ing the Magellanic System: Stellar populations in the Magellanic Bridge
• The VMC Survey -- XXXIV. Morphology of Stellar Populations in the Magellanic Clouds
• Structure of the Large Magellanic Cloud from the Near Infrared magnitudes of Red Clump stars
• The MAGellanic Inter-Cloud project (MAGIC) I: Evidence for intermediate-age stellar populations in between the Magellanic Clouds
• Red Giant Branch Stars as Probes of Stellar Populations I: 2MASS Calibration and Application to 2MASS GC01
• Distances to Populous Clusters in the LMC via the K-Band Luminosity of the Red Clump
• SDSS-IV MaNGA: Stellar Population Gradients Within Barred Galaxies
• Metallicity distribution functions of the old populations of the Magellanic Clouds from RR Lyrae stars
• The VMC survey -- XLI. Stellar proper motions within the Small Magellanic Cloud
• Stellar substructures in the periphery of the Magellanic Clouds with the VISTA Hemisphere Survey from the red clump and other tracers
• History and modes of star formation in the most active region of the Small Magellanic Cloud, NGC 346
• Chemical evolution of the Small Magellanic Cloud based on planetary nebulae
• The VMC Survey. XXIX. Turbulence-Controlled Hierarchical Star Formation in the Small Magellanic Cloud
• The BaLROG project - II. Quantifying the influence of bars on the stellar populations of nearby galaxies
• Evolution of dust and molecular hydrogen in the Magellanic System
• Tidally induced bars in dwarf galaxies on different orbits around a Milky Way-like host
• CaII Triplet Spectroscopy of Small Magellanic Cloud Red Giants. II. Abundances for a Sample of Field Stars
• Morphology and metallicity of the Small Magellanic Cloud using RRab stars
• Physical parameters of the Small Magellanic Cloud RR Lyrae stars and the distance scale
• RR Lyrae variables in the Small Magellanic Cloud - II. The extended area: chemical and structural analysis
• Bridge over troubled gas: clusters and associations under the SMC and LMC tidal stresses
• Spectroscopy of the Young Stellar Association Price-Whelan 1: Origin in the Magellanic Leading Arm and Constraints on the Milky Way Hot Halo
• The Giant Branches of Open and Globular Clusters in the Infrared as Metallicity Indicators: A Comparison with Theory
• The VMC Survey. XI. Radial Stellar Population Gradients in the Galactic Globular Cluster 47 Tucanae
• From K giants to G dwarfs: stellar lifetime effects on metallicity distributions derived from red giants
• Gaia Early Data Release 3: Structure and properties of the Magellanic Clouds

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• OGLE-ing the Magellanic System: Optical Reddening Maps of the Large and Small Magellanic Cloud from Red Clump Stars
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• Magellanic Mayhem: Metallicities and Motions
• The chemical DNA of the Magellanic Clouds -- I. The chemical composition of 206 Small Magellanic Cloud red giant stars
• Ca II Triplet Spectroscopy of Small Magellanic Cloud Red Giants. V. Abundances and Velocities for 12 Massive Clusters
• Ca II Triplet Spectroscopy of Small Magellanic Cloud Red Giants. VI. Analysis of chemical properties of the Main Body
• The TRAPUM Large Magellanic Cloud pulsar survey with MeerKAT I: Survey setup and first seven pulsar discoveries
• The VMC survey -- LIII. Data release #7. Complete survey data and data from additional programmes
• The VMC Survey -- LIV. Anomalous Cepheids in the Magellanic Clouds Period-Luminosity relations in the near-infrared bands
• The Small Magellanic Cloud through the lens of the James Webb Space Telescope : binaries and mass function within the galaxy outskirts
• Strömgren photometric metallicity map of the Magellanic Cloud stars using Gaia DR3--XP spectra
• SMC-Last Mosaic Images
• Hubble Space Telescope proper motions of Large Magellanic Cloud star clusters -- II. Kinematic structure of young and intermediate-age clusters
• Catalogue of central stars of extragalactic planetary nebulae