Metallicity-dependendent kinematics and morphology of the Milky Way bulge

Abstract

We use N-body chemo-dynamic simulations to study the coupling between morphology, kinematics and metallicity of the bar/bulge region of our Galaxy. We make qualitative comparisons of our results with available observations and find very good agreement. We conclude that this region is complex, since it comprises several stellar components with different properties -- i.e. a boxy/peanut bulge, thin and thick disc components, and, to lesser extents, a disky pseudobulge, a stellar halo and a small classical bulge -- all cohabiting in dynamical equilibrium. Our models show strong links between kinematics and metallicity, or morphology and metallicity, as already suggested by a number of recent observations. We discuss and explain these links.

arXiv comment5 pages, 4 figures, accepted for publication in MNRAS Letters

References in corpus (21)

• Cosmological SPH simulations: A hybrid multi-phase model for star formation
• The Initial Mass Function of Stars: Evidence for Uniformity in Variable Systems
• Nucleosynthesis in Chandrasekhar Mass Models for Type Ia Supernovae and Constraints on Progenitor Systems and Burning-Front Propagation
• Cosmological SPH simulations: The entropy equation
• Damped Lyman alpha Systems
• ARGOS III: Stellar Populations in the Galactic Bulge of the Milky Way
• ARGOS IV: The Kinematics of the Milky Way Bulge
• Evolution of the Milky Way with radial motions of stars and gas I. The solar neighborhood and the thin and thick disk
• The origin of the split red clump in the Galactic bulge of the Milky Way
• Insights on the Milky Way bulge formation from the correlations between kinematics and metallicity
• The Gaia-ESO Survey: metallicity and kinematic trends in the Milky Way bulge
• K-Band Observations of Boxy Bulges. I. Morphology and Surface Brightness Profiles
• Forming disk galaxies in wet major mergers. I. Three fiducial examples
• Before the Bar: Kinematic Detection of A Spheroidal Metal-Poor Bulge Component
• Constraining the structure and formation of the Galactic bulge from a field in its outskirts. FLAMES-GIRAFFE spectra of about 400 red giants around (l,b)=(0°,-10°)
• Why the Milky Way's bulge is not only a bar formed from a cold thin disk
• Metallicity gradients through disk Instability: A simple model for the Milky Way's boxy bulge
• Metallicity and kinematics of the bar in-situ
• Formation of the Galactic bulge from a two-component stellar disk: Explaining cylindrical rotation and vertical metallicity gradient
• Kinematics in the Galactic Bulge with APOGEE: II. High-Order Kinematical Moments and Comparison to Extragalactic Bar Diagnostics
• Correlations between kinematics and metallicity in the Galactic bulge: a review

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• Chemodynamics of barred galaxies in cosmological simulations: On the Milky Way's quiescent merger history and in-situ bulge
• PLATO as it is: a legacy mission for Galactic archaeology
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• Bimodality of [α/Fe]-[Fe/H] distributions is a natural outcome of dissipative collapse and disc growth in Milky Way-type galaxies
• Stars behind bars I: The Milky Way's central stellar populations
• Formation, vertex deviation and age of the Milky Way's bulge: input from a cosmological simulation with a late-forming bar
• Stellar populations across galaxy bars in the MUSE TIMER project
• The stellar populations of the central region of M31
• Box/peanut-shaped bulges in action space
• Disc galaxies formed from major mergers in Illustris
• Quantifying the (X/peanut)-shaped Structure of the Milky Way - New Constraints on the Bar Geometry
• What the Milky Way bulge reveals about the initial metallicity gradients in the disc
• Stars behind bars II: A cosmological formation scenario for the Milky Way's central stellar structure
• Kinematics of RR Lyrae stars in the Galactic bulge with OGLE-IV and Gaia DR2
• Bars & boxy/peanut bulges in thin & thick discs: I. Morphology and line-of-sight velocities of a fiducial model
• The disc origin of the Milky Way bulge: On the necessity of the thick disc
• Was the Milky Way Bulge Formed From The Buckling Disk Instability, Hierarchical Collapse, Accretion of Clumps, or All of the Above?
• Formation of N-rich field stars in the high-density building blocks of the Galactic bulge
• The imprint of clump formation at high redshift. II. The chemistry of the bulge
• Galaxies within galaxies in the TIMER survey: stellar populations of inner bars are scaled replicas of main bars
• Modeling the chemical enrichment history of the Bulge Fossil Fragment Terzan 5
• Barlenses in the CALIFA survey: combining the photometric and stellar population analysis
• Buckling bars in nearly face-on galaxies observed with MaNGA
• Mapping the tilt of the Milky Way bulge velocity ellipsoids with ARGOS and $Gaia$ DR2
• Age-morphology dependence of the Milky Way boxy/peanut bulge seen in Mira variables
• Bars and boxy/peanut bulges in thin and thick discs III. Boxy/peanut bulge formation and evolution in presence of thick discs
• Comparing bulge RR Lyrae stars with bulge giants -- Insight from 3D kinematics
• The small boxy/peanut structure of the Milky Way traced by old stars
• The Galactic Bulge exploration IV.: RR~Lyrae stars as traces of the Galactic bar -- 3D and 5D analysis, extinction variation
• The disc origin of the Milky Way bulge: On the high velocity dispersion of metal-rich stars at low latitude
• Formation and evolution of boxy/peanut bulges in the Auriga cosmological simulations
• The Spheroidal Bulge of the Milky Way: Chemodynamically Distinct from the Inner-Thick Disc and Bar
• Blanco DECam Bulge Survey (BDBS) IV: Metallicity Distributions and Bulge Structure from 2.6 Million Red Clump Stars
• The impact of bars on the properties of HII regions in the TIMER survey
• Closing remarks and Outlook