Chemodynamical signatures of bar resonances in the Galactic disk: current data and future prospects

Abstract

The Galactic disk exhibits complex chemical and dynamical substructure thought to be induced by the bar, spiral arms, and satellites. Here, we explore the chemical signatures of bar resonances in action and velocity space and characterize the differences between the signatures of corotation and higher-order resonances using test particle simulations. Thanks to recent surveys, we now have large datasets containing metallicities and kinematics of stars outside the solar neighborhood. We compare the simulations to the observational data from Gaia EDR3 and LAMOST DR5 and find weak evidence for a slow bar with the "hat" moving group ($250\text{km/s}\lesssim v_{\varphi }\lesssim 270\text{km/s}$) associated with its outer Lindblad resonance and "Hercules" ($170\text{km/s}\lesssim v_{\varphi }\lesssim 195\text{km/s}$) with corotation. While constraints from current data are limited by their spatial footprint, stars closer in azimuth than the Sun to the bar's minor axis show much stronger signatures of the bar's outer Lindblad and corotation resonances in test particle simulations. Future datasets with greater azimuthal coverage, including the final Gaia data release, will allow reliable chemodynamical identification of bar resonances.

arXiv commentPublished in ApJ

References in corpus (67)

• Gaia Data Release 2. Summary of the contents and survey properties
• The Gaia mission
• The 2.5 m Telescope of the Sloan Digital Sky Survey
• Estimating distances from parallaxes IV: Distances to 1.33 billion stars in Gaia Data Release 2
• Sloan Digital Sky Survey IV: Mapping the Milky Way, Nearby Galaxies, and the Distant Universe
• The Sixteenth Data Release of the Sloan Digital Sky Surveys: First Release from the APOGEE-2 Southern Survey and Full Release of eBOSS Spectra
• Trigonometric Parallaxes of High Mass Star Forming Regions: the Structure and Kinematics of the Milky Way
• Radial Mixing in Galactic Discs
• Chemical evolution with radial mixing
• LAMOST Experiment for Galactic Understanding and Exploration (LEGUE) The survey science plan
• A dynamically young and perturbed Milky Way disk
• The Effect of the Outer Lindblad Resonance of the Galactic Bar on the Local Stellar Velocity Distribution
• Riding the Spiral Waves: Implications of Stellar Migration for the Properties of Galactic Disks
• Gaia Data Release 2: Mapping the Milky Way disc kinematics
• Mapping the Three-Dimensional Density of the Galactic Bulge with VVV Red Clump Stars
• Dynamical modelling of the Galactic bulge and bar: the Milky Way's bar pattern speed, stellar, and dark matter mass distribution
• The Structure of the Milky Way's Bar Outside the Bulge
• The photometric structure of the inner Galaxy
• Footprints of the Sagittarius dwarf galaxy in the $Gaia$ data set
• Actions for axisymmetric potentials
• Modelling the Galactic Bar Using Red Clump Giants
• The GALAH survey and Gaia DR2: dissecting the stellar disc's phase space by age, action, chemistry and location
• Life in the fast lane: a direct view of the dynamics, formation, and evolution of the Milky Way's bar
• Gas flow models in the Milky Way embedded bars
• Signatures of radial migration in barred galaxies: Azimuthal variations in the metallicity distribution of old stars
• Chemodynamics of barred galaxies in cosmological simulations: On the Milky Way's quiescent merger history and in-situ bulge
• The pattern speed of the Milky Way bar from transverse velocities
• Models of our Galaxy II
• Constraints on the Galactic Bar from the Hercules stream as traced with RAVE across the Galaxy
• A New Photometric Model of the Galactic Bar using Red Clump Giants
• The properties of the Galactic bar implied by gas kinematics in the inner Milky Way
• Radial Distribution of Stellar Motions in Gaia DR2
• Gas flow in barred potentials - III. Effects of varying the Quadrupole
• Low-Velocity Streams in the Solar Neighborhood Caused by the Galactic Bar
• Transient spiral structure and the disc velocity substructure in Gaia DR2
• Spiral-induced velocity and metallicity patterns in a cosmological zoom simulation of a Milky Way-sized galaxy
• The Pattern Speed of the Galactic Bar
• Resonance sweeping by a decelerating Galactic bar
• The effects of bar-spiral coupling on stellar kinematics in the Galaxy
• The signatures of the resonances of a large Galactic bar in local velocity space
• New Constraints on the Galactic Bar
• The GALAH survey and Gaia DR2: Linking ridges, arches and vertical waves in the kinematics of the Milky Way
• Gaia Early Data Release 3: The Galactic anticentre
• Fluctuations in galactic bar parameters due to bar-spiral interaction
• A boxy bulge in the Milky Way. Inversion of the stellar statistics equation with 2MASS data
• A relationship between specific star formation rate and metallicity gradient within z=1 galaxies from KMOS-HiZELS
• Signatures of resonance and phase mixing in the Galactic disc
• Tree-ring structure of Galactic bar resonance
• The disc origin of the Milky Way bulge: Dissecting the chemo-morphological relations using N-body simulations and APOGEE
• A Recent Lindblad Resonance in the Solar Neighbourhood
• On the ridges, undulations & streams in Gaia DR2: Linking the topography of phase-space to the orbital structure of an N-body bar
• The 4:1 Outer Lindblad Resonance of a long slow bar as a potential explanation for the Hercules stream
• Identifying resonances of the Galactic bar in Gaia DR2: I. Clues from action space
• Phase Space Structure in the Solar Neighbourhood
• Trapped orbits and solar-neighbourhood kinematics
• Spiral arm crossings inferred from ridges in Gaia stellar velocity distributions
• Escapees from the bar resonances. On the presence of low-eccentricity, metal-rich stars at the Solar vicinity
• Proper Motion Dispersions of Red Clump Giants in the Galactic Bulge: Observations and Model Comparisons
• Discriminating among theories of spiral structure using Gaia DR2
• Chemo-kinematics of the Milky Way spiral arms and bar resonances: connection to ridges and moving groups in the Solar vicinity
• Made-to-measure galaxy models - III Modelling with Milky Way observations
• Galactic Bar Resonances Inferred from Kinematically Hot Stars in Gaia EDR3
• Box/peanut-shaped bulges in action space
• Identifying resonances of the Galactic bar in Gaia DR2: II. Clues from angle space
• Revealing the spiral arms through radial migration and the shape of the Metallicity Distribution Function
• Effect of orbital trapping by bar resonances in the local U-V velocity field
• Impact of bar resonances in the velocity-space distribution of the solar neighbourhood stars in a self-consistent $N$-body Galactic disc simulation

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• Mapping the Galactic Metallicity Gradient with Open Clusters: The State-of-the-Art and Future Challenges
• Stellar halo substructure generated by bar resonances
• Chemical Cartography with LAMOST and Gaia Reveal Azimuthal and Spiral Structure in the Galactic Disk
• Radial halo substructure in harmony with the Galactic bar
• Timing the Milky Way bar formation and the accompanying radial migration episode
• The Non-Axisymmetric Influence: Radius and Angle-Dependent Trends in a Barred Galaxy
• Trojan globular clusters: radial migration via trapping in bar resonances
• Dynamical streams in the local stellar halo
• Gas Transfer Between the Inner 3-kpc Disk and the Galactic Central Molecular Zone
• Moving Groups in the Solar Neighborhood with Gaia, APOGEE, GALAH, and LAMOST: Dynamical Effects Gather Gas and the Ensuing Star Formation Plays an Important Role in Shaping the Stellar Velocity Distributions