Kinematic analysis of the Large Magellanic Cloud using Gaia DR3

Abstract

Context: The high quality of the Gaia mission data is allowing to study the internal kinematics of the Large Magellanic Cloud (LMC) in unprecedented detail, providing insights on the non-axisymmetric structure of its disc. Aims: To define and validate an improved selection strategy to distinguish the LMC stars from the Milky Way foreground. To check the possible biases that assumed parameters or sample contamination from the Milky Way can introduce in the analysis of the internal kinematics of the LMC using Gaia data. Methods: Our selection is based on a supervised Neural Network classifier using as much as of the Gaia DR3 data as possible. We select three samples of candidate LMC stars with different degrees of completeness and purity; we validate them using different test samples and we compare them with the Gaia Collaboration paper sample. We analyse the resulting velocity profiles and maps, and we check how these results change when using also the line-of-sight velocities, available for a subset of stars. Results: The contamination in the samples from Milky Way stars affects basically the results for the outskirts of the LMC, and the absence of line-of-sight velocities does not bias the results for the kinematics in the inner disc. For the first time, we perform a kinematic analysis of the LMC using samples with the full three dimensional velocity information from Gaia DR3. Conclusions: The dynamics in the inner disc is mainly bar dominated; the kinematics on the spiral arm over-density seem to be dominated by an inward motion and a rotation faster than that of the disc in the piece of the arm attached to the bar; contamination of MW stars seem to dominate the outer parts of the disc and mainly affects old evolutionary phases; uncertainties in the assumed disc morphological parameters and line-of-sight velocity of the LMC can in some cases have significant effects. [ABRIDGED]

References in corpus (32)

• Gaia Early Data Release 3: The astrometric solution
• Gaia Early Data Release 3: Parallax bias versus magnitude, colour, and position
• 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
• New Understanding of Large Magellanic Cloud Structure, Dynamics and Orbit from Carbon Star Kinematics
• Third-Epoch Magellanic Cloud Proper Motions I: HST/WFC3 data and Orbit Implications
• Magellanic Cloud Structure from Near-IR Surveys I: The Viewing Angles of the LMC
• The VMC Survey - I. Strategy and First Data
• Third-Epoch Magellanic Cloud Proper Motions II: The Large Magellanic Cloud Rotation Field in Three Dimensions
• Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G=18.5
• Magellanic Cloud Structure from Near-IR Surveys II: Star Count Maps and the Intrinsic Elongation of the LMC
• The formation of spiral arms and rings in barred galaxies
• SMASH - Survey of the MAgellanic Stellar History
• SMASHing the LMC: A Tidally-induced Warp in the Outer LMC and a Large-scale Reddening Map
• Bars do drive spiral density waves
• On the galaxy spiral arms' nature as revealed by rotation frequencies
• The Proper Motion Field Along the Magellanic Bridge: a New Probe of the LMC-SMC Interaction
• Three dimensional maps of the Magellanic Clouds using RR~Lyrae stars and Cepheids - I. The Large Magellanic Cloud
• The recent LMC-SMC collision: Timing and impact parameter constraints from comparison of Gaia LMC disk kinematics and N-body simulations
• Overview and stellar statistics of the expected Gaia Catalogue using the Gaia Object Generator
• Internal dynamics of the Large Magellanic Cloud from Gaia DR2
• The VMC Survey -- XLVIII. Classical Cepheids unveil the 3D geometry of the LMC
• The VMC Survey -- XLII. Near-infrared period-luminosity relations for RR Lyrae stars and the structure of the Large Magellanic Cloud
• Tidal-induced lopsidedness in Magellanic-type galaxies
• A SkyMapper view of the Large Magellanic Cloud: The dynamics of stellar populations
• The Case of the Off-Center, Levitating Bar in the Large Magellanic Cloud
• The VMC survey -- XXXVIII. Proper motion of the Magellanic Bridge
• A novel method to bracket the corotation radius in galaxy disks: vertex deviation maps
• The Magellanic Edges Survey III. Kinematics of the disturbed LMC outskirts
• How the bar properties affect the induced spiral structure
• The VMC survey -- XLV. Proper motion of the outer LMC and the impact of the SMC
• The VMC survey -- XLVI. Stellar proper motions in the centre of the Large Magellanic Cloud

Cited by in corpus (20)

• The effect of the LMC on the Milky Way system
• Establishing a mass-loss rate relation for red supergiants in the Large Magellanic Cloud
• Stellar variability in Gaia DR3. I. Three-band photometric dispersions for 145 million sources
• Application of a Neural Network classifier for the generation of clean Small Magellanic Cloud stellar samples
• Vertical structure and kinematics of the LMC disc from SDSS/Gaia
• Equilibrium dynamical models in the inner region of the Large Magellanic Cloud based on Gaia DR3 kinematics
• Tidal interaction can stop galactic bars: on the LMC non-rotating bar
• Precise Measurements of the LMC Bar's Geometry With Gaia DR3 and a Novel Solution to Crowding Induced Incompleteness in Star Counting
• Episodic mass loss in the very luminous red supergiant [W60] B90 in the Large Magellanic Cloud
• A comprehensive kinematic model of the LMC disk from star clusters and field stars using Gaia DR3: Tracing the disk characteristics, rotation, bar, and the outliers
• Spatio-temporal map of star clusters in the Magellanic Clouds using Gaia: Synchronized peaks and radial shrinkage of cluster formation
• The VMC survey -- LIV. The internal kinematics of the LMC with new VISTA observations
• The 3D kinematics of stellar substructures in the periphery of the Large Magellanic Cloud
• Asymmetries in the LMC velocity maps
• Dynamics of tidal spiral arms: Machine learning-assisted identification of equations and application to the Milky Way
• Tidally-induced radial migration waves in LMC-like galaxies
• A comprehensive search for high-velocity X-ray sources: New compact object binary candidates in the Gaia era
• The orbital dynamics of the LMC and SMC about the Milky Way
• Hubble Space Telescope proper motions of Large Magellanic Cloud star clusters -- II. Kinematic structure of young and intermediate-age clusters
• Bar pattern speed modulation across LMC stellar populations