VINTERGATAN II: the history of the Milky Way told by its mergers

Abstract

Using the VINTERGATAN cosmological zoom simulation, we explore the contributions of the in situ and accreted material, and the effect of galaxy interactions and mergers in the assembly of a Milky Way-like galaxy. We find that the initial growth phase of galaxy evolution, dominated by repeated major mergers, provides the necessary physical conditions for the assembly of a thick, kinematically hot disk populated by high-[$\alpha$/Fe] stars, formed both in situ and in accreted satellite galaxies. We find that the diversity of evolutionary tracks followed by the simulated galaxy and its progenitors leads to very little overlap of the in situ and accreted populations for any given chemical composition. At a given age, the spread in [$\alpha$/Fe] abundance ratio results from the diversity of physical conditions in VINTERGATAN and its satellites, with an enhancement in [$\alpha$/Fe] found in stars formed during starburst episodes. Later, the cessation of the merger activity promotes the in situ formation of stars in the low-[$\alpha$/Fe] regime, in a radially extended, thin and overall kinematically colder disk, thus establishing chemically bimodal thin and thick disks, in line with observations. We draw links between notable features in the [Fe/H] - [$\alpha$/Fe] plane with their physical causes, and propose a comprehensive formation scenario explaining self-consistently, in the cosmological context, the main observed properties of the Milky Way.

arXiv commentMNRAS in press. Movies available at http://www.astro.lu.se/~florent/vintergatan.php

References in corpus (153)

• Cosmic Star Formation History
• The Formation of Galactic Disks
• Cosmological Hydrodynamics with Adaptive Mesh Refinement: a new high resolution code called RAMSES
• Galaxy Harassment and the Evolution of Clusters of Galaxies
• The Galaxy in Context: Structural, Kinematic and Integrated Properties
• Radiative Transfer in a Clumpy Universe: II. The Utraviolet Extragalactic Background
• The Geneva-Copenhagen survey of the Solar neighbourhood: Ages, metallicities, and kinematic properties of 14,000 F and G dwarfs
• Galaxies on FIRE (Feedback In Realistic Environments): Stellar Feedback Explains Cosmologically Inefficient Star Formation
• Galactic star formation and accretion histories from matching galaxies to dark matter haloes
• Physical Models of Galaxy Formation in a Cosmological Framework
• The PLATO 2.0 Mission
• The merger that led to the formation of the Milky Way's inner stellar halo and thick disk
• Star Formation Histories, Abundances and Kinematics of Dwarf Galaxies in the Local Group
• Exploring the Milky Way stellar disk. A detailed elemental abundance study of 714 F and G dwarf stars in the Solar neighbourhood
• Radial Mixing in Galactic Discs
• Co-formation of the Galactic disc and the stellar halo
• Starburst-driven Mass Loss from Dwarf Galaxies: Efficiency and Metal Ejection
• The Chemical Evolution of the Galaxy: the two-infall model
• Dancing in the dark: galactic properties trace spin swings along the cosmic web
• Multi-scale initial conditions for cosmological simulations
• The Chemical Compositions of Galactic Disk F and G Dwarfs
• The Ghost of Sagittarius and Lumps in the Halo of the Milky Way
• Chemical evolution with radial mixing
• Abundance Gradients and the Formation of the Milky Way
• alpha-, r-, and s-process element trends in the Galactic thin and thick disks
• Chemical Cartography with APOGEE: Metallicity Distribution Functions and the Chemical Structure of the Milky Way Disk
• Simulations of Galaxy Formation in a Lambda CDM Universe II: The Fine Structure of Simulated Galactic Disks
• A giant stream of metal-rich stars in the halo of the galaxy M31
• Constraints from Dynamical Friction on the Dark Matter Content of Barred Galaxies
• Two distinct halo populations in the solar neighborhood. Evidence from stellar abundance ratios and kinematics
• The age structure of stellar populations in the solar vicinity. Clues of a two-phase formation history of the Milky Way disk
• A Merger-Driven Scenario for Cosmological Disk Galaxy Formation
• Evidence for Two Early Accretion Events That Built the Milky Way Stellar Halo
• Towards a complete accounting of energy and momentum from stellar feedback in galaxy formation simulations
• The Birth of a Galaxy: Primordial Metal Enrichment and Stellar Populations
• Chemodynamical evolution of the Milky Way disk I: The solar vicinity
• HOP: A New Group-Finding Algorithm for N-body Simulations
• Making Galaxies in a Cosmological Context: The Need for Early Stellar Feedback
• Momentum Injection by Supernovae in the Interstellar Medium
• The Emergence of the Thick Disk in a CDM Universe
• Streams, substructures and the early history of the Milky Way
• Galaxy pairs in the Sloan Digital Sky Survey - IV: Interactions trigger AGN
• The thick disks of spiral galaxies as relics from gas-rich, turbulent, clumpy disks at high redshift
• Smooth(er) Stellar Mass Maps in CANDELS: Constraints on the Longevity of Clumps in High-redshift Star-forming Galaxies
• In disguise or out of reach: first clues about in-situ and accreted stars in the stellar halo of the Milky Way from Gaia DR2
• Cold Dark Matter Substructure and Galactic Disks I: Morphological Signatures of Hierarchical Satellite Accretion
• 4MOST: Project overview and information for the First Call for Proposals
• The Biggest Splash
• Star Formation in Galaxy Mergers with Realistic Models of Stellar Feedback & the Interstellar Medium
• Thin, thick and dark discs in LCDM
• Supernova Feedback in an Inhomogeneous Interstellar Medium
• Inside Out and Upside Down: Tracing the Assembly of a Simulated Disk Galaxy Using Mono-Age Stellar Populations
• Connecting the cosmic web to the spin of dark halos: implications for galaxy formation
• The Origin and Evolution of the Mass-Metallicity Relationship for Galaxies: Results from Cosmological N-Body Simulations
• The birth of the Milky Way as uncovered by accurate stellar ages with Gaia
• Galaxy Pairs in the Sloan Digital Sky Survey - V. Tracing changes in star formation rate and metallicity out to separations of 80 kpc
• The Genesis of the Milky Way's Thick Disk via Stellar Migration
• How stellar feedback simultaneously regulates star formation and drives outflows
• The stellar population structure of the Galactic disk
• A First Constraint on the Thick Disk Scale Length: Differential Radial Abundances in K Giants at Galactocentric Radii 4, 8, and 12 kpc
• The Milky Way has no in-situ halo other than the heated thick disc. Composition of the stellar halo and age-dating the last significant merger with Gaia DR2 and APOGEE
• Metallicity Gradients in Disks: Do Galaxies Form Inside-Out?
• Quenching and ram pressure stripping of simulated Milky Way satellite galaxies
• Chemodynamics of the Milky Way. I. The first year of APOGEE data
• Spectroscopic determination of masses (and implied ages) for red giants
• Tracing chemical evolution over the extent of the Milky Way's Disk with APOGEE Red Clump Stars
• Bursting and Quenching in Massive Galaxies without Major Mergers or AGNs
• The Fermi Bubbles. I. Possible Evidence for Recent AGN Jet Activity in the Galaxy
• Galactic Archaeology with asteroseismic ages: evidence for delayed gas infall in the formation of the Milky Way disc
• On the Formation of Galactic Thick Disks
• Radial Migration Does Little for Galactic Disc Thickening
• A three-dimensional map of the Milky Way using classical Cepheid variable stars
• The Merging History of the Milky Way
• The Auriga Stellar Haloes: Connecting stellar population properties with accretion and merging history
• Accuracy and precision of industrial stellar abundances
• Dynamical Evolution of Galaxies in Clusters
• Hierarchical formation of bulgeless galaxies II: Redistribution of angular momentum via galactic fountains
• On the origin of the chemical bimodality of disk stars: A tale of merger and migration
• Star formation is boosted (and quenched) from the inside out: radial star formation profiles from MaNGA
• Fuel Efficient Galaxies: Sustaining Star Formation with Stellar Mass Loss
• Starbursts triggered by inter-galactic tides and interstellar compressive turbulence
• A Simple Law of Star Formation
• The Discovery of Tidal Tails Around NGC 5466
• Constraining Sub-Grid Physics with High-Redshift Spatially-Resolved Metallicity Distributions
• The two-phase formation history of spiral galaxies traced by the cosmic evolution of the bar fraction
• Inflow, Outflow, Yields, and Stellar Population Mixing in Chemical Evolution Models
• VINTERGATAN I: The origins of chemically, kinematically and structurally distinct discs in a simulated Milky Way-mass galaxy
• Cosmological Galaxy Formation Simulations Using SPH
• Confirming chemical clocks: asteroseismic age dissection of the Milky Way disk(s)
• The Structure and Dynamical Evolution of the Stellar Disk of a Simulated Milky Way-Mass Galaxy
• Measuring Radial Orbit Migration in the Milky Way Disk
• The GIRAFFE Inner Bulge Survey (GIBS) III. Metallicity distributions and kinematics of 26 Galactic bulge fields
• Disentangling the Galactic Halo with APOGEE: I. Chemical and Kinematical Investigation of Distinct Metal-Poor Populations
• The interplay between a galactic bar and a supermassive black hole: nuclear fueling in a sub-parsec resolution galaxy simulation
• Candidate super star cluster progenitor gas clouds possibly triggered by close passage to Sgr A*
• Response of the Milky Way's disc to the Large Magellanic Cloud in a first infall scenario
• The unexpectedly large proportion of high-mass star-forming cores in a Galactic mini-starburst
• Origin of chemically distinct discs in the Auriga cosmological simulations
• Evolution of the Stellar-to-Dark Matter Relation: Separating Star-Forming and Passive Galaxies from z=1 to 0
• Sausage & Mash: The dual origin of the Galactic thick disc and halo from the gas-rich Gaia-Enceladus-Sausage merger
• The Lazy Giants: APOGEE Abundances Reveal Low Star Formation Efficiencies in the Magellanic Clouds
• The metallicity bimodality of globular cluster systems: a test of galaxy assembly and of the evolution of the galaxy mass-metallicity relation
• The origin of the Milky Way globular clusters
• Timing the Early Assembly of the Milky Way with the H3 Survey
• On the kinematic detection of accreted streams in the Gaia era: a cautionary tale
• The imprint of clump formation at high redshift. I. A disc alpha-abundance dichotomy
• The Inside-out Growth of the Galactic Disk
• The origin of diverse $\alpha$-element abundances in galaxy discs
• Two Disk Components from a Gas Rich Disk-Disk Merger
• Excitation of coupled stellar motions in the Galactic Disk by orbiting satellites
• Environmental regulation of cloud and star formation in galactic bars
• NIHAO-UHD: The properties of MW-like stellar disks in high resolution cosmological simulations
• Spatial variations in the Milky Way disc metallicity-age relation
• Exponential Galaxy Disks from Stellar Scattering
• APOGEE DR14/DR15 Abundances in the Inner Milky Way
• Bimodality of [α/Fe]-[Fe/H] distributions is a natural outcome of dissipative collapse and disc growth in Milky Way-type galaxies
• The GALAH Survey: Chemodynamics of the Solar Neighbourhood
• Determining Ages of APOGEE Giants with Known Distances
• Unveiling the Distinct Formation Pathways of the Inner and Outer Discs of the Milky Way with Bayesian Machine Learning
• A Study of the Effect of Bulges on Bar Formation in Disk galaxies
• The age-chemical abundance structure of the Galactic disc II: $\alpha$-dichotomy and thick disc formation
• Star Clusters in Evolving Galaxies
• VINTERGATAN III: how to reset the metallicity of the Milky Way
• Ages and Masses of 0.64 million Red Giant Branch stars from the LAMOST Galactic Spectroscopic Survey
• From massive spirals to dwarf irregulars: a new set of tight scaling relations for cold gas and stars driven by disc gravitational instability
• The Splash without a merger
• Origins of the Thick Disk as Traced by the Alpha-Elements of Metal-Poor Giant Stars Selected from RAVE
• Ionized absorbers as evidence for supernova-driven cooling of the lower Galactic corona
• Characterizing gravitational instability in turbulent multi-component galactic discs
• Tides in colliding galaxies
• The angular momentum of baryons and dark matter halos revisited
• Extreme gas fractions in clumpy, turbulent disk galaxies at z~0.1
• How runaway stars boost galactic outflows
• Mapping the Monoceros Ring in 3D with Pan-STARRS1
• A diversity of starburst-triggering mechanisms in interacting galaxies and their signatures in CO emission
• Detailed abundances in the Galactic center: Evidence of a metal-rich alpha-enhanced stellar population
• Minor mergers and their impact on the kinematics of old and young stellar populations in disk galaxies
• Panchromatic Hubble Andromeda Treasury XII. Mapping Stellar Metallicity Distributions in M31
• Identifying Sagittarius Stream Stars By Their APOGEE Chemical Abundance Signatures
• Geometric properties of galactic discs with clumpy episodes
• Formation of the Galactic bulge from a two-component stellar disk: Explaining cylindrical rotation and vertical metallicity gradient
• Thick-disk evolution induced by the growth of an embedded thin disk
• Density Variations in the NW Star Stream of M31
• An observational test for star formation prescriptions in cosmological hydrodynamical simulations
• Rapid Filamentary Accretion as the Origin of Extended Thin Discs
• Supernovae feedback propagation: the role of turbulence
• Milky Way's Thick and Thin disk: Is there distinct thick disk?
• Global Simulations of Galactic Discs: Violent Feedback from Clustered Supernovae during Bursts of Star Formation
• Chemical evolution of the Galactic Center
• Quantifying tidal stream disruption in a simulated Milky Way
• Forming disc galaxies in major mergers: III. The effect of angular momentum on the radial density profiles of disc galaxies
• 4MOST Consortium Survey 4: Milky Way Disc and Bulge High-Resolution Survey (4MIDABLE-HR)
• Power-law Sersic profiles in hydrostatic stellar galaxy discs

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• The Poor Old Heart of the Milky Way
• Chemo-kinematics of the $Gaia$ RR Lyrae: the halo and the disc
• APOGEE DR16: a multi-zone chemical evolution model for the Galactic disc based on MCMC methods
• The GALAH Survey: Chemical tagging and chrono-chemodynamics of accreted halo stars with GALAH+ DR3 and $Gaia$ eDR3
• Galactic Archaeology with Gaia
• Spectroscopic age estimates for APOGEE red-giant stars: Precise spatial and kinematic trends with age in the Galactic disc
• Unveiling the Distinct Formation Pathways of the Inner and Outer Discs of the Milky Way with Bayesian Machine Learning
• Co-formation of the thin and thick discs revealed by APOGEE-DR16 and Gaia-DR2
• VINTERGATAN III: how to reset the metallicity of the Milky Way
• Unveiling the time evolution of chemical abundances across the Milky Way disk with APOGEE
• The merger and assembly histories of Milky Way- and M31-like galaxies with TNG50: disk survival through mergers
• Characterizing epochs of star formation across the Milky Way disc using age-metallicity distributions of GALAH stars
• On the origin of the Galactic thin and thick discs, their abundance gradients and the diagnostic potential of their abundance ratios
• The merger-starburst connection across cosmic times
• The distribution of globular clusters in kinematic spaces does not trace the accretion history of the host galaxy
• The challenge of simultaneously matching the observed diversity of chemical abundance patterns in cosmological hydrodynamical simulations
• Exploring the origin of thick disks using the NewHorizon and Galactica simulations
• The Three-Phase Evolution of the Milky Way
• Radial structure and formation of the Milky Way disc
• From giant clumps to clouds I: the impact of gas fraction evolution on the stability of galactic discs
• Neutron star mergers as the astrophysical site of the r-process in the Milky Way and its satellite galaxies
• From giant clumps to clouds -- II. The emergence of thick disc kinematics from the conditions of star formation in high redshift gas rich galaxies
• Formation of Galactic Disks I: Why Did the Milky Way's Disk Form Unusually Early?
• Rapid Filamentary Accretion as the Origin of Extended Thin Discs
• [Mg/Fe] ratios in the solar neighbourhood: stellar yields and chemical evolution scenarios
• VINTERGATAN IV: Cosmic phases of star formation in Milky Way-like galaxies
• How cosmological merger histories shape the diversity of stellar haloes
• VINTERGATAN-GM: The cosmological imprints of early mergers on Milky-Way-mass galaxies
• The stellar halo in Local Group Hestia simulations I. The in-situ component and the effect of mergers
• (Re)mind the gap: a hiatus in star formation history unveiled by APOGEE DR17
• Exploring the diversity and similarity of radially anisotropic Milky Way-like stellar haloes: implications for disrupted dwarf galaxy searches
• The imprint of clump formation at high redshift. II. The chemistry of the bulge
• The structure and characteristic scales of the HI gas in galactic disks
• The metal-poor end of the Spite plateau. II. Detailed chemical investigation
• From giant clumps to clouds IV: extreme star-forming clumps on top of universal cloud scaling relations in gas-rich galaxies
• Empirical derivation of the metallicity evolution with time and radius using TNG50 Milky Way/Andromeda analogues
• Detailed $\alpha$ abundance trends in the inner Galactic bulge
• Evolution of the radial ISM metallicity gradient in the Milky Way disk since redshift $\approx 3$
• Disk flaring with TNG50: diversity across Milky Way and M31 analogs
• Double Red Giant Branch and Red Clump features of Galactic disc stellar populations with Gaia GSPspec
• Cosmic Sands: The Origin of Dusty, Star-forming Galaxies in the Epoch of Reionization
• Chronology of our Galaxy from Gaia colour-magnitude diagram fitting (ChronoGal) II. Unveiling the formation and evolution of the kinematically selected Thick and Thin Discs
• A Blueprint for the Milky Way's Stellar Populations. IV. A String of Pearls $-$ the Galactic Starburst Sequence
• Rediscovering the Milky Way with orbit superposition approach and APOGEE data II. Chrono-chemo-kinematics of the disc
• Reconciling extragalactic star formation efficiencies with theory: insights from PHANGS
• Effects of secular growth and mergers on the evolution of metallicity gradients and azimuthal variations in a Milky Way-like galaxy
• Unusual gas structure in an otherwise normal spiral galaxy hosting GRB 171205A / SN 2017iuk
• Milky Way Mapper decoded abundances -- I. Shared disc enrichment patterns
• Deciphering the Milky Way's star formation at cosmic noon with high proper-motion stars: A precursor to the merger-driven starburst
• Gas flows in galaxy mergers: supersonic turbulence in bridges, accretion from the circumgalactic medium, and metallicity dilution
• Rapid early gas accretion for the inner Galactic disc