Dynamics of the Magellanic Clouds in a LCDM Universe

Abstract

We examine Milky Way-Magellanic Cloud systems selected from the Millennium-II Simulation in order to place the orbits of the Magellanic Clouds in a cosmological context. Our analysis shows that satellites massive enough to be LMC analogs are typically accreted at late times. Moreover, those that are accreted at early times and survive to the present have orbital properties that are discrepant with those observed for the LMC. The high velocity of the LMC, coupled with the dearth of unbound orbits seen in the simulation, argues that the mass of the MW's halo is unlikely to be less than 2 x 10^12 Msun. This conclusion is further supported by statistics of halos hosting satellites with masses, velocities, and separations comparable to those of the LMC. We further show that: (1) LMC and SMC-mass objects are not particularly uncommon in MW-mass halos; (2) the apparently high angular momentum of the LMC is not cosmologically unusual; and (3) it is rare for a MW halo to host a LMC-SMC binary system at z=0, but high speed binary pairs accreted at late times are possible. Based on these results, we conclude that the LMC was accreted within the past four Gyr and is currently making its first pericentric passage about the MW.

14 pages, 13 figures; MNRAS, in press. Minor revisions, conclusions unchanged

References in corpus (53)

• The Sloan Digital Sky Survey: Technical Summary
• A Universal Density Profile from Hierarchical Clustering
• The Structure of Cold Dark Matter Halos
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• The Seventh Data Release of the Sloan Digital Sky Survey
• Simulating the joint evolution of quasars, galaxies and their large-scale distribution
• Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant
• Statistical Properties of X-ray Clusters: Analytic and Numerical Comparisons
• The Aquarius Project: the subhalos of galactic halos
• Constraints on the relationship between stellar mass and halo mass at low and high redshift
• Using the Evolution of Clusters to Constrain Omega
• Resolving Cosmic Structure Formation with the Millennium-II Simulation
• Triaxial Modeling of Halo Density Profiles with High-resolution N-body Simulations
• Modeling Luminosity-Dependent Galaxy Clustering Through Cosmic Time
• The Milky Way's Circular Velocity Curve to 60 kpc and an Estimate of the Dark Matter Halo Mass from Kinematics of ~2400 SDSS Blue Horizontal Branch Stars
• Properties of Galaxy Groups in the SDSS: I.-- The Dependence of Colour, Star Formation, and Morphology on Halo Mass
• The Shape of Dark Matter Halos: Dependence on Mass, Redshift, Radius, and Formation
• Formation and evolution of galaxy dark matter halos and their substructure
• Are the Magellanic Clouds on their First Passage about the Milky Way?
• The spin and shape of dark matter haloes in the Millennium simulation of a LambdaCDM universe
• Simultaneous ram pressure and tidal stripping; how dwarf spheroidals lost their gas
• Dynamical Friction and Galaxy Merging Timescales
• The origin of angular momentum in dark matter halos
• The Masses of the Milky Way and Andromeda galaxies
• N-body Simulations of the Small Magellanic Cloud and the Magellanic Stream
• The Proper Motion of the Large Magellanic Cloud using HST
• The radial velocity dispersion profile of the Galactic halo: Constraining the density profile of the dark halo of the Milky Way
• A New Look at the Kinematics of Neutral Hydrogen in the Small Magellanic Cloud
• Is the SMC Bound to the LMC? The HST Proper Motion of the SMC
• Merger Histories of Galaxy Halos and Implications for Disk Survival
• Simulations of the Magellanic Stream in a First Infall Scenario
• Orbital Parameters of Merging Dark Matter Halos
• Masses for the Local Group and the Milky Way
• The Rise and Fall of Satellites in Galaxy Clusters
• The Mass of the Milky Way: Limits from a Newly Assembled Set of Halo Objects
• Merging history as a function of halo environment
• Exploring Halo Substructure with Giant Stars XI: The Tidal Tails of the Carina Dwarf Spheroidal and the Discovery of Magellanic Cloud Stars in the Carina Foreground
• Substructure in Dark Halos: Orbital Eccentricities and Dynamical Friction
• Modelling galaxy clustering in a high resolution simulation of structure formation
• The Mass Profile of the Galaxy to 80 kpc
• On the Orbits of Infalling Satellite Halos
• Cosmic Ménage à Trois: The Origin of Satellite Galaxies On Extreme Orbits
• What determines satellite galaxy disruption?
• The velocity dispersion and mass profile of the Milky Way
• The Dependence of the Mass Assembly History of Cold Dark Matter Halos on Environment
• Proper Motions of Dwarf Spheroidal Galaxies from Hubble Space Telescope Imaging. IV: Measurement for Sculptor
• Proper Motions of Dwarf Spheroidal Galaxies from Hubble Space Telescope Imaging. V: Final Measurement for Fornax
• Dark Matter Halo Growth II: Diffuse Accretion and its Environmental Dependence
• First Results from the NOAO Survey of the Outer Limits of the Magellanic Clouds
• Implications of Recent Measurements of the Milky Way Rotation for the Orbit of the Large Magellanic Cloud
• On the scarcity of Magellanic Cloud-like satellites
• A Dynamical Model for the Orbit of the Andromeda Galaxy M31 and the Origin of the Local Group of Galaxies
• The Dwarf Satellites of M31 and the Galaxy

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• The Missing Satellites of the Magellanic Clouds? Gaia Proper Motions of the Recently Discovered Ultra-Faint Galaxies
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• Orbits of Massive Satellite Galaxies: I. A Close Look at the Large Magellanic Cloud and a New Orbital History for M33
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• Infall Times for Milky Way Satellites From Their Present-Day Kinematics
• Satellites of LMC-Mass Dwarfs: Close Friendships Ruined by Milky Way Mass Halos
• Detection of the Milky Way reflex motion due to the Large Magellanic Cloud infall
• The Eating Habits of Milky Way Mass Halos: Destroyed Dwarf Satellites and the Metallicity Distribution of Accreted Stars
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• First Gaia Dynamics of the Andromeda System: DR2 Proper Motions, Orbits, and Rotation of M31 and M33
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• Low Surface Brightness Imaging of the Magellanic System: Imprints of Tidal Interactions between the Clouds in the Stellar Periphery
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• The Origin of the Microlensing Events Observed Towards the LMC and the Stellar Counterpart of the Magellanic Stream
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• Orbital evidences for dark-matter-free Milky Way dwarf spheroidal galaxies
• Milky Way Tomography with K and M Dwarf Stars: the Vertical Structure of the Galactic Disk
• Satellites of Milky Way- and M31-like galaxies with TNG50: quenched fractions, gas content, and star formation histories
• Tidal-induced lopsidedness in Magellanic-type galaxies
• A comparative study of satellite galaxies in Milky Way-like galaxies from HSC, DECaLS and SDSS
• $\Lambda$CDM Predictions for the Satellite Population of M33
• Constraints on the Shape of the Milky Way Dark Matter Halo from Jeans Equations Applied to SDSS Data
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• Vertical structure and kinematics of the LMC disc from SDSS/Gaia
• Statistical properties of substructures around Milky Way-sized haloes and their implications for the formation of stellar streams
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• The Magellanic Clouds are very rare in the IllustrisTNG simulations
• No globular cluster progenitors in Milky Way satellite galaxies
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• Observing EAGLE galaxies with JWST: predictions for Milky Way progenitors and their building blocks
• A Simulation Based Inference Approach to the Dynamics of the MW-LMC System -- Validation
• Major mergers with small galaxies - the discovery of a Magellanic-type galaxy at z=0.12
• The effect of environment on the mass assembly history of the Milky Way and M31
• Local Group Proper Motion Dynamics
• Quantifying the Milky Way, LMC and their interaction using all-sky kinematics of outer halo stars
• The progenitor galaxies of stellar haloes as "failed" Milky Ways
• Mapping the Distorted Dark Matter Distribution of the LMC-SMC System Prior to Milky Way Infall with Basis Function Expansions
• The orbital dynamics of the LMC and SMC about the Milky Way