Does the dwarf galaxy system of the Milky Way originate from Andromeda?

Abstract

The Local Group is often seen to be a quiescent environment without significant merger events. However an ancient major merger may have occurred in the most massive galaxy. Numerical simulations have shown that tidal tails formed during gas-rich major mergers are long-lived and could be responsible for old stellar streams and likely induce the formation of tidal dwarf galaxies (TDGs). Using several hydrodynamical simulations we have investigated the most prominent tidal tail formed during the first passage, which is gas-rich and contains old and metal poor stars. We discovered several striking coincidences after comparing its location and motion to those of the Milky Way (MW) and of the Magellanic Clouds (MCs). First, the tidal tail is sweeping a relatively small volume in which the MW precisely lies. Because the geometry of the merger is somehow fixed by the anisotropic properties of the Giant Stream (GS), we evaluate the chance of the MW to be at such a rendez-vous with this gigantic tidal tail to be 5 %. Second, the velocity of the tidal tail matches the LMC proper motion, and reproduce quite well the geometrical and angular momentum properties of the MW dwarfs, i.e. the so-called disk of satellites, better called Vast Polar Structure (VPOS). Third, the simulation of the tidal tail reveals one of the formed TDG with mass and location almost comparable to those of the LMC. Our present modeling is however too limited to study the detailed interaction of gas-rich TDGs with the potential of the MW, and a complementary study is required to test whether the dwarf intrinsic properties can be accounted for by our scenario. Nevertheless this study suggests a causal link between an ancient, gas-rich major merger at the M31 location, and several enigma in the Local Group, the GS, the VPOS, and the presence of the MCs.

17 pages accepted MNRAS

References in corpus (26)

• The observed properties of dwarf galaxies in and around the Local Group
• Cats and Dogs, Hair and A Hero: A Quintet of New Milky Way Companions
• Are the Magellanic Clouds on their First Passage about the Milky Way?
• A common mass scale for satellite galaxies of the Milky Way
• The Haunted Halos of Andromeda and Triangulum: A panorama of galaxy formation in action
• The Luminosity Function of the Milky Way Satellites
• The M31 Velocity Vector. II. Radial Orbit Towards the Milky Way and Implied Local Group Mass
• The spatial distribution of the Milky Way and Andromeda satellite galaxies
• Small Dwarf Galaxies Within Larger Dwarfs: Why Some Are Luminous While Most Go Dark
• The orbital poles of Milky Way satellite galaxies: a rotationally supported disc-of-satellites
• From Tidal Dwarf Galaxies to Satellite Galaxies
• High-resolution simulations of galaxy mergers: Resolving globular cluster formation
• M31 Transverse Velocity and Local Group Mass from Satellite Kinematics
• Proper Motions of Dwarf Spheroidal Galaxies from Hubble Space Telescope Imaging. IV: Measurement for Sculptor
• Discs of Satellites: the new dwarf spheroidals
• Systemic Proper Motions of Milky Way Satellites from Stellar Redshifts: the Carina, Fornax, Sculptor and Sextans Dwarf Spheroidals
• Discovery of a Faint Old Stellar System at 150 kpc
• Was the Andromeda Stream Produced by a Disk Galaxy?
• The Stellar Content of Galaxy Halos: A Comparison between LambdaCDM Models and Observations of M31
• Galaxy And Mass Assembly (GAMA): In Search of Milky-Way Magellanic Cloud Analogues
• Can filamentary accretion explain the orbital poles of the Milky Way satellites?
• Galaxy disks do not need to survive in the L-CDM paradigm: the galaxy merger rate out to z~1.5 from morpho-kinematic data
• The Extended Star Formation History of the Andromeda Spheroid at Twenty One Kiloparsecs on the Minor Axis
• Dwarf spheroidal satellites of the Milky Way from dark matter free tidal dwarf galaxy progenitors: maps of orbits
• Loops formed by tidal tails as fossil records of a major merger
• Revisiting the Role of M31 in the Dynamical History of the Magellanic Clouds

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• Mirror dark matter: Cosmology, galaxy structure and direct detection
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• The rotationally stabilized VPOS and predicted proper motions of the Milky Way satellite galaxies
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• The vast thin plane of M31 co-rotating dwarfs: an additional fossil signature of the M31 merger and of its considerable impact in the whole Local Group
• Solving the small-scale structure puzzles with dissipative dark matter
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• The Magellanic Stream System: I. Ram-pressure tails and the relics of the collision between the Magellanic Clouds
• The failures of the standard model of cosmology require a new paradigm
• Reproducing properties of MW dSphs as descendants of DM-free TDGs
• The stellar mass-size relation for the most isolated galaxies in the local Universe
• The multiplicity and anisotropy of galactic satellite accretion
• MOND simulation suggests the origin of some peculiarities in the Local Group
• Dwarf elliptical galaxies as ancient tidal dwarf galaxies
• Perseus I and the NGC 3109 association in the context of the Local Group dwarf galaxy structures
• A new spin on disks of satellite galaxies
• Chemo-dynamical evolution of tidal dwarf galaxies. II. The long-term evolution and influence of a tidal field
• Galaxies lacking dark matter in the Illustris simulation
• Hypervelocity Star Candidates in the SEGUE G & K Dwarf Sample
• Co-orbiting planes of sub-halos are similarly unlikely around paired and isolated hosts
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• A Recent Major Merger Tale for the Closest Giant Elliptical Galaxy Centaurus A
• The alignment of SDSS satellites with the VPOS: effects of the survey footprint shape
• A Formation Scenario for the Disk of Satellites: Accretion of Satellites during Mergers
• The mass-metallicity relation of tidal dwarf galaxies
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• On the absence of dark matter in dwarf galaxies surrounding the Milky Way
• The ultra-diffuse dwarf galaxies NGC 1052-DF2 and 1052-DF4 are in conflict with standard cosmology
• Study of gravitational fields and globular cluster systems of early-type galaxies
• Gaia EDR3 proper motions of Milky Way dwarfs. II: Velocities, Total Energy and Angular Momentum
• A portrait of the Vast Polar Structure as a young phenomenon: hints from its member satellites
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• The kinematics of the Local Group in a cosmological context
• On the Mass Assembly History of the Local Group
• Classifying the satellite plane membership of Centaurus A's dwarf galaxies using orbital alignment constraints
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• A Study of the Properties and Dynamics of the Disk of Satellites in a Milky-Way-like Galaxy System
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• Refueled and shielded - The early evolution of Tidal Dwarf Galaxies
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• Simulations on the survivability of Tidal Dwarf Galaxies