Revisiting the Role of M31 in the Dynamical History of the Magellanic Clouds

Abstract

We study the dynamics of the Magellanic Clouds in a model for the Local Group whose mass is constrained using the timing argument/two-body limit of the action principle. The goal is to evaluate the role of M31 in generating the high angular momentum orbit of the Clouds, a puzzle that has only been exacerbated by the latest $HST$ proper motion measurements. We study the effects of varying the total Local Group mass, the relative mass of the Milky Way and M31, the proper motion of M31, and the proper motion of the LMC on this problem. Over a large part of this parameter-space we find that tides from M31 are insignificant. For a range of LMC proper motions approximately $3\sigma$ higher than the mean and total Local Group mass $>3.5\times 10^{12}{M}_{\odot }$, M31 can provide a significant torque to the LMC orbit. However, if the LMC is bound to the MW, then M31 is found to have negligible effect on its motion and the origin of the high angular momentum of the system remains a puzzle. Finally, we use the timing argument to calculate the total mass of the MW-LMC system based on the assumption that they are encountering each other for the first time, their previous perigalacticon being a Hubble time ago, obtaining $M_{\mathrm{MW}}+M_{\mathrm{LMC}}=(8.7\pm 0.8)\times 10^{11}{M}_{\odot }$.

arXiv comment10 pages, 5 figures, accepted to ApJ

References in corpus (33)

• A Universal Density Profile from Hierarchical Clustering
• The Structure of Cold Dark Matter Halos
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Data Processing, Sky Maps, and Basic Results
• Trigonometric Parallaxes of Massive Star Forming Regions: VI. Galactic Structure, Fundamental Parameters and Non-Circular Motions
• The Proper Motion of Sgr A*: II. The Mass of Sgr A*
• LCDM-based models for the Milky Way and M31 I: Dynamical Models
• New Understanding of Large Magellanic Cloud Structure, Dynamics and Orbit from Carbon Star Kinematics
• Are the Magellanic Clouds on their First Passage about the Milky Way?
• The Present and Future Mass of the Milky Way Halo
• N-body Simulations of the Small Magellanic Cloud and the Magellanic Stream
• The Proper Motion of the Large Magellanic Cloud using HST
• Is the SMC Bound to the LMC? The HST Proper Motion of the SMC
• Masses for the Local Group and the Milky Way
• The Parkes HI Survey of the Magellanic System
• The Mass of the Milky Way Galaxy
• The Geometric Distance and Proper Motion of the Triangulum Galaxy (M33)
• First Determination of the Distance and Fundamental Properties of an Eclipsing Binary in The Andromeda Galaxy
• The Mass of the Andromeda Galaxy
• M31 Transverse Velocity and Local Group Mass from Satellite Kinematics
• Action Principle Solutions For Galaxy Motions Within 3000 Km/s
• The Collision Between The Milky Way And Andromeda
• Did the Milky Way dwarf satellites enter the halo as a group?
• Milky Way potentials in CDM and MOND. Is the Large Magellanic Cloud on a bound orbit?
• Radial and Transverse Velocities of Nearby Galaxies
• The Proper Motion of the Local Group Galaxy IC 10
• Constraints on the Proper Motion of the Andromeda Galaxy Based on the Survival of Its Satellite M33
• Implications of Recent Measurements of the Milky Way Rotation for the Orbit of the Large Magellanic Cloud
• 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
• A possible common halo of the Magellanic Clouds
• Using Perturbative Least Action to Recover Cosmological Initial Conditions
• Using Perturbative Least Action to Reconstruct the Local Group
• Dark energy and the mass of the Local Group

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• Not too big, not too small: the dark halos of the dwarf spheroidals in the Milky Way
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• Where are the Fossils of the First Galaxies? I. Local Volume Maps and Properties of the Undetected Dwarfs
• Galaxy And Mass Assembly (GAMA): In Search of Milky-Way Magellanic Cloud Analogues
• Does the dwarf galaxy system of the Milky Way originate from Andromeda?
• Renegade Subhaloes in the Local Group
• A census of orbital properties of the M31 satellites
• Could the Magellanic Clouds be tidal dwarves expelled from a past-merger event occurring in Andromeda?
• Systematic uncertainties from halo asphericity in dark matter searches
• UGC 4703 interacting pair near to an isolated spiral galaxy NGC 2718: A Milky Way Magellanic Cloud analogue
• Tracing the Magellanic Clouds Back in Time
• Timing Mass of the Local Group
• The orbital dynamics of the LMC and SMC about the Milky Way