Mass models of the Milky Way and estimation of its mass from the GAIA DR3 data-set

Abstract

We use data from the Gaia DR3 dataset to estimate the mass of the Milky Way (MW) by analyzing the rotation curve in the range of distances 5 kpc to 28 kpc. We consider three mass models: the first model adds a spherical dark matter (DM) halo, following the Navarro-Frenk-White (NFW) profile, to the known stellar components. The second model assumes that DM is confined to the Galactic disk, following the idea that the observed density of gas in the Galaxy is related to the presence of more massive DM disk (DMD), similar to the observed correlation between DM and gas in other galaxies. The third model only uses the known stellar mass components and is based on the Modified Newton Dynamics (MOND) theory. Our results indicate that the DMD model is comparable in accuracy to the NFW and MOND models and fits the data better at large radii where the rotation curve declines but has the largest errors. For the NFW model we obtain a virial mass $M_{vir}=(6.5\pm 0.3)\times 10^{11}{M}_{\odot }$ with concentration parameter $c=14.5$, that is lower than what is typically reported. In the DMD case we find that the MW mass is $M_d=(1.6\pm 0.5)\times 10^{11}{M}_{\odot }$ with a disk's characteristic radius of $R_d=17$ kpc.

14 pages, 5 figures, accepted for publication in The Astrophysical Journal

References in corpus (19)

• The Gaia mission
• The mass distribution and gravitational potential of the Milky Way
• High-Resolution Rotation Curves and Galaxy Mass Models from THINGS
• 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 Milky Way's circular velocity curve between 4 and 14 kpc from APOGEE data
• On the Shoulders of Giants: Properties of the Stellar Halo and the Milky Way Mass Distribution
• Transient spirals as superposed instabilities
• Mapping the Milky Way Disk with Gaia DR3: 3D extended kinematic maps and rotation curve to $\approx 30$ kpc
• A Milky Way with a massive, centrally concentrated thick disc: new Galactic mass models for orbit computations
• Hic sunt dracones: Cartography of the Milky Way spiral arms and bar resonances with Gaia Data Release 2
• Bayesian Mass Estimates of the Milky Way II: The dark and light sides of parameter assumptions
• Gaia-DR2 extended kinematical maps. Part II: Dynamics in the Galactic disk explaining radial and vertical velocities
• The Imprint of Spiral Arms on the Galactic Rotation Curve
• Warp and flare of the Galactic disc revealed with supergiants by Gaia EDR3
• Gaia-DR2 extended kinematical maps. Part III: Rotation curves analysis, dark matter, and Modified Newtonian dynamics tests
• Long-lived transient structure in collisionless self-gravitating systems
• Formation of disks with long-lived spiral arms from violent gravitational dynamics
• Exact semianalytical calculation of rotation curves with Bekenstein-Milgrom nonrelativistic MOND

Cited by in corpus (16)

• Detection of the Keplerian decline in the Milky Way rotation curve
• Spatially Coherent 3D Distributions of HI and CO in the Milky Way
• Open star clusters and their asymmetrical tidal tails
• The Escape Velocity Profile of the Milky Way from Gaia DR3
• EDEN: Exploring Disks Embedded in N-body simulations of Milky-Way-mass halos from Symphony
• Exploring the Dark Matter Disc Model in Dwarf Galaxies: Insights from the LITTLE THINGS Sample
• The Milky Way accretion history compared to cosmological simulations -- from bulge to dwarf galaxy infall
• Exploring sub-GeV Dark Matter Physics with Cosmic Ray and Future Telescopes
• Equivalence Principle and Machian origin of extended gravity
• Line-of-sight mass estimator and the masses of the Milky Way and Andromeda Galaxy
• Cosmological implications of the Gaia Milky Way declining rotation curve
• Exploring Milky Way rotation curves with Gaia DR3: a comparison between $\Lambda$CDM, MOND, and General Relativistic approaches
• Implications of the Milky Way Declining Rotation Curve
• Orbital dynamics in galactic potentials under mass transfer
• Investigating the origin of the Milky Way streams. A revised look at their orbital pole distribution in light of precession effects
• Testing MOND using the dynamics of nearby stellar streams