A Milky Way with a massive, centrally concentrated thick disc: new Galactic mass models for orbit computations

Abstract

In this work, two new axisymmetric models for the Galactic mass distribution are presented. Motivated by recent results, these two models include the contribution of a stellar thin disc and of a thick disc, as massive as the thin counterpart but with a shorter scale-length. Both models satisfy a number of observational constraints: stellar densities at the solar vicinity, thin and thick disc scale lengths and heights, rotation curve(s), and the absolute value of the perpendicular force Kz as a function of distance to the Galactic centre. We numerically integrate into these new models the motion of all Galactic globular clusters for which distances, proper motions, and radial velocities are available, and the orbits of about one thousand stars in the solar vicinity. The retrieved orbital characteristics are compared to those obtained by integrating the clusters and stellar orbits in pure thin disc models. We find that, due to the possible presence of a thick disc, the computed orbital parameters of disc stars can vary by as much as 30-40%. We also show that the systematic uncertainties that affect the rotation curve still plague computed orbital parameters of globular clusters by similar amounts.

arXiv comment20 pages, 14 figures, 4 tables

References in corpus (38)

• Local Kinematics and the Local Standard of Rest
• The Galaxy in Context: Structural, Kinematic and Integrated Properties
• Trigonometric Parallaxes of High Mass Star Forming Regions: the Structure and Kinematics of the Milky Way
• The Milky Way Tomography with SDSS: I. Stellar Number Density Distribution
• The mass distribution and gravitational potential of the Milky Way
• Mass models of the Milky Way
• Chemical Cartography with APOGEE: Metallicity Distribution Functions and the Chemical Structure of the Milky Way Disk
• Chemical abundances of 1111 FGK stars from the HARPS GTO planet search program.Galactic stellar populations and planets
• The age structure of stellar populations in the solar vicinity. Clues of a two-phase formation history of the Milky Way disk
• A direct dynamical measurement of the Milky Way's disk surface density profile, disk scale length, and dark matter profile at 4 kpc < R < 9 kpc
• The spatial structure of mono-abundance sub-populations of the Milky Way disk
• The Milky Way's circular velocity curve between 4 and 14 kpc from APOGEE data
• Our Milky Way as a Pure-Disk Galaxy -- A Challenge for Galaxy Formation
• Mass models of the Milky Way
• On the mass-to-light ratio of the local Galactic disc and the optical luminosity of the Galaxy
• The Milky Way has no thick disk
• Stars, Gas, and Dark Matter in the Solar Neighborhood
• The Bulge Radial Velocity Assay (BRAVA): II. Complete Sample and Data Release
• Anti-Truncation of Disks in Early-Type Barred Galaxies
• 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
• On the Shoulders of Giants: Properties of the Stellar Halo and the Milky Way Mass Distribution
• Chemodynamics of the Milky Way. I. The first year of APOGEE data
• Milky Way Mass Models for Orbit Calculations
• Reconstructing the star formation history of the Milky Way disc(s) from chemical abundances
• The dominant epoch of star formation in the Milky Way formed the thick disc
• A Grand Rotation Curve and Dark Matter Halo in the Milky Way Galaxy
• Before the Bar: Kinematic Detection of A Spheroidal Metal-Poor Bulge Component
• Models for the Gravitational Field of the Galactic Bar. An Application to Stellar Orbits in the Galactic Plane and Orbits of Some Globular Clusters
• Nonlinear Effects in Models of the Galaxy: 1. Midplane Stellar Orbits in the Presence of 3D Spiral Arms
• Why the Milky Way's bulge is not only a bar formed from a cold thin disk
• The incorrect rotation curve of the Milky Way
• Mapping a stellar disk into a boxy bulge: The outside-in part of the Milky Way bulge formation
• The disc origin of the Milky Way bulge
• Models for the 3-D axisymmetric gravitational potential of the Milky Way Galaxy - A detailed modelling of the Galactic disk
• The asymmetric drift, the local standard of rest, and implications from RAVE data
• Anti-truncated stellar light profiles in the outer regions of STAGES spiral galaxies: bulge or disc related?
• Photometric scaling relations of antitruncated stellar discs in S0-Scd galaxies

Cited by in corpus (58)

• The Circular Velocity Curve of the Milky Way from $5$ to $25$ kpc
• 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
• The Milky Way total mass profile as inferred from Gaia DR2
• On the estimation of the Local Dark Matter Density using the rotation curve of the Milky Way
• The local high velocity tail and the Galactic escape speed
• Detection of the Keplerian decline in the Milky Way rotation curve
• Gaia EDR3 proper motions of Milky Way dwarfs I: 3D Motions and Orbits
• Chemical evolution of the Milky Way: constraints on the formation of the thick and thin discs
• The Rotation Curve, Mass Distribution and Dark Matter Content of the Milky Way from Classical Cepheids
• Reviving old controversies: is the early Galaxy flat or round? Investigations into the early phases of the Milky Way formation through stellar kinematics and chemical abundances
• Testing dark matter and geometry sustained circular velocities in the Milky Way with Gaia DR2
• First Gaia dynamical model of the Milky Way disc with six phase space coordinates: a test for galaxy dynamics
• Milky Way total Mass derived by Rotation Curve and Globular Cluster kinematics from Gaia EDR3
• Mass models of the Milky Way and estimation of its mass from the GAIA DR3 data-set
• Local RR Lyrae Stars: native and alien
• Dynamical model of the Milky Way using APOGEE and Gaia data
• Mergers, tidal interactions, and mass exchange in a population of disc globular clusters
• [Mg/Fe] ratios in the solar neighbourhood: stellar yields and chemical evolution scenarios
• Substructure at High Speed II: The Local Escape Velocity and Milky Way Mass with Gaia DR2
• Mergers, tidal interactions, and mass exchange in a population of disc globular clusters: II. Long-term evolution
• The e-TidalGCs Project: Modeling the extra-tidal features generated by Galactic globular clusters
• Which Milky Way masses are consistent with the slightly declining 5-25 kpc rotation curve?
• The structure of the Milky Way based on unWISE 3.4$\mu$m integrated photometry
• The accretion history of the Milky Way. I. How it shapes globular clusters and dwarf galaxies
• Multiple stellar population mass loss in massive Galactic globular clusters
• The Escape Velocity Profile of the Milky Way from Gaia DR3
• The Spectacular Tidal Tails of Globular Cluster M3 (NGC 5272)
• A Pulsar-Based Map of Galactic Acceleration
• On the dynamical evolution of Cepheids in star clusters
• Efficient and accurate force replay in cosmological-baryonic simulations
• Dynamical effects in the observed rate of change of the orbital and the spin periods of radio pulsars: Improvement in the method of estimation and its implications
• Unraveling UBC 274: a morphological, kinematical and chemical analysis of a disrupting open cluster
• Testing gravity with the Milky Way: Yukawa potential
• Equilibrium axisymmetric halo model for the Milky Way and its implications for direct and indirect DM searches
• GalRotpy: an educational tool to understand and parametrize the rotation curve and gravitational potential of disk-like galaxies
• Rediscovering the Milky Way with orbit superposition approach and APOGEE data II. Chrono-chemo-kinematics of the disc
• Rediscovering the Milky Way with orbit superposition approach and APOGEE data I. Method validation
• Quasilocal Newtonian limit of general relativity and galactic dynamics
• Modelling the Track of the GD-1 Stellar Stream Inside a Host with a Fermionic Dark Matter Core-Halo Distribution
• Revisit NGC 5466 Tidal Stream with $Gaia$, SDSS/SEGUE and LAMOST
• Existence of Tidal Tails for the Globular Cluster NGC 5824
• Gaps in stellar streams as a result of globular cluster fly-bys
• Can tides explain the low dark matter density in Fornax?
• The Stellar Population and Orbit of the Galactic Globular Cluster Palomar 3
• A Dwarf Galaxy Debris Stream Associated with Palomar 1 and the Anticenter Stream
• Cosmological implications of the Gaia Milky Way declining rotation curve
• An intriguing coincidence between the majority of vast polar structure dwarfs and a recent major merger at the M31 position
• The Nephele ecosystem: stars, globular clusters, and stellar streams associated with the progenitor galaxy of $\omega$ Centauri
• The Sagittarius stellar stream embedded in a fermionic dark matter halo
• Orbital dynamics in galactic potentials under mass transfer
• Milky Way Mass Through Escape Velocity Curve from LAMOST K Giants
• An efficient integrator for stellar dynamics in effective gravity fields based on the isochrone potential
• Thermodynamics of self-gravitating fermions as a robust theory for dark matter halos: Stability analysis applied to the Milky Way
• Neutrinos from stars in the Milky Way
• Gaia DR3 high radial velocity stars: Genuine fast-moving objects or outliers?
• Determination of the best dark matter profile for the Milky Way with Gaia DR3 using Bayesian Model Comparison
• The odd primordial halo of the Milky Way implied by Gaia. A shallow core, but a steep decline
• Galactic tides in the Solar System within a non-axisymmetric Milky Way model adjusted to Gaia data