Exploring Milky Way rotation curves with Gaia DR3: a comparison between $\Lambda$CDM, MOND, and General Relativistic approaches

Abstract

With the release of Gaia DR3, we extend the comparison between dynamical models for the Milky Way rotation curve initiated in the previous work. Utilising astrometric and spectro-photometric data for 719143 young disc stars within $|z|<1$ kpc and up to $R\simeq 19$ kpc, we investigate the accuracy of MOND and $\Lambda$CDM frameworks in addition to previously studied models, such as the classical one with a Navarro-Frenk-White dark matter halo and a general relativistic model. We find that all models, including MOND and $\Lambda$CDM, are statistically equivalent in representing the observed rotational velocities. However, $\Lambda$CDM, characterized by an Einasto density profile and cosmological constraints on its parameters, assigns more dark matter than the model featuring a Navarro-Frenk-White profile, with the virial mass estimated at $1.5\text{-}2.5\times 10^{12}{\mathrm{M}}_{\odot }$ - a value significantly higher than recent literature estimates. Beyond $10\text{-}15$ kpc, non-Newtonian/non-baryonic contributions to the rotation curve are found to become dominant for all models consistently. Our results suggest the need for further exploration into the role of General Relativity, dark matter, and alternative theories of gravitational dynamics in shaping Milky Way's rotation curve.

arXiv comment18 pages, 7 figures, 2 tables. Accepted for publication in JCAP

References in corpus (27)

• Planck 2013 results. XVI. Cosmological parameters
• Galactic star formation and accretion histories from matching galaxies to dark matter haloes
• The Milky Way Tomography with SDSS: I. Stellar Number Density Distribution
• The Inner Structure of LambdaCDM Halos III: Universality and Asymptotic Slopes
• The mass distribution and gravitational potential of the Milky Way
• Cold dark matter haloes in the Planck era: evolution of structural parameters for Einasto and NFW profiles
• Concentration, Spin and Shape of Dark Matter Haloes as a Function of the Cosmological Model: WMAP1, WMAP3 and WMAP5 results
• The Radial Acceleration Relation in Rotationally Supported Galaxies
• The Circular Velocity Curve of the Milky Way from $5$ to $25$ kpc
• One Law To Rule Them All: The Radial Acceleration Relation of Galaxies
• The Milky Way total mass profile as inferred from Gaia DR2
• Stars, Gas, and Dark Matter in the Solar Neighborhood
• A new determination of the local dark matter density from the kinematics of K dwarfs
• Fitting the radial acceleration relation to individual SPARC galaxies
• Gaia Data Release 3: Mapping the asymmetric disc of the Milky Way
• Milky Way Mass Models and MOND
• Optimal Data-Based Binning for Histograms
• Weighing the local dark matter with RAVE red clump stars
• Detection of the Keplerian decline in the Milky Way rotation curve
• The Circular Velocity Curve of the Milky Way from 5 to 25 kpc using luminous red giant branch star
• Mapping the Milky Way Disk with Gaia DR3: 3D extended kinematic maps and rotation curve to $\approx 30$ kpc
• Non-Newtonian behavior in weak field general relativity for extended rotating sources
• Testing dark matter and geometry sustained circular velocities in the Milky Way with Gaia DR2
• Weighing the Galactic disk using phase-space spirals II. Most stringent constraints to a thin dark disk using Gaia EDR3
• A constant characteristic volume density of dark matter haloes from SPARC rotation curve fits
• 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

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• The frame-dragging vector potential on galaxy scales from Dark-Matter-only Newtonian $N$-body simulations