Dark Halos of M31 and the Milky Way

Abstract

Grand rotation curves (GRC) within ~400 kpc of M31 and the Milky Way were constructed by combining disk rotation velocities and radial velocities of satellite galaxies and globular clusters. The GRC for the Milky Way was revised using the most recent Solar rotation velocity. The derived GRCs were deconvolved into a de Vaucouleurs bulge, exponential disk, and a dark halo with the Navarro-Frenk-White (NFW) density profile by the least chi-squares fitting. Comparison of the best-fit parameters revealed similarity of the disks and bulges of the two galaxies, whereas the dark halo mass of M31 was found to be twice the Galaxy's. We show that the NFW model may be a realistic approximation to the observed dark halos in these two giant spirals.

9 pages, 9 figures, accepted for PASJ

Cited by in corpus (42)

• Rotation and Mass in the Milky Way and Spiral Galaxies
• Kinematics of the local disk from the RAVE survey and the Gaia first data release
• Toward a Complete Understanding of the Magellanic Stream Formation
• Dark matter in galaxies
• Constraining Primordial Black Hole Fraction at the Galactic Centre using radio observational data
• 3D hydrodynamic simulations for the formation of the Local Group satellite planes
• Simulating the Galactic Multi-messenger Emissions with HERMES
• The SIBELIUS Project: E Pluribus Unum
• Deciphering the evolution of the Milky Way discs: Gaia APOGEE Kepler giant stars and the Besançon Galaxy Model
• $\text{galkin}$: a new compilation of the Milky Way rotation curve data
• APOGEE discovery of a chemically atypical star disrupted from NGC 6723 and captured by the Milky Way bulge
• The impact of the Large Magellanic Cloud on dark matter direct detection signals
• Ruling out $\sim 100-300$ GeV thermal relic annihilating dark matter by radio observation of the Andromeda galaxy
• Evidence for a Massive Andromeda Galaxy Using Satellite Galaxy Proper Motions
• Satellite mass functions and the faint end of the galaxy mass-halo mass relation in LCDM
• CAPOS: the bulge Cluster APOgee Survey II. The Intriguing "Sequoia" Globular Cluster FSR 1758
• Which Milky Way masses are consistent with the slightly declining 5-25 kpc rotation curve?
• MOKA3D: An innovative approach to 3D gas kinematic modelling. I. Application to AGN ionized outflows
• Revisiting the constraints on annihilating dark matter by radio observational data of M31
• Cosmic flow around local massive galaxies
• APOGEE-2S view of the globular cluster Patchick 125 (Gran 3). New metallicity and elemental abundances from high-resolution spectroscopy
• Milky Way and M31 rotation curves: $\Lambda$CDM vs. MOND
• Gaia-IGRINS synergy: Orbits of Newly Identified Milky Way Star Clusters
• Constraints on dark matter with future MeV gamma-ray telescopes
• Diagnostics of Gaseous Halo of the Milky Way by a Shock Wave from the Galactic Centre
• Apocalypse When? No Certainty of a Milky Way -- Andromeda Collision
• The local dark matter distribution in self-interacting dark matter halos
• The insight into the dark side. I. The pitfalls of the dark halo parameters estimation
• Modeling the Cosmic Dispersion Measure in the D < 120 Mpc Local Universe
• A new method to constrain annihilating dark matter
• Elongated Gravity Sources as an Analytical Limit for Flat Galaxy Rotation Curves
• Dark matter fraction derived from the M31 rotation curve
• Detection of diffuse gamma-ray emission towards a massive star forming region hosting Wolf-Rayet stars
• The effect of magnetic field on the inner Galactic rotation curve
• Topological constraints on general relativistic galaxies: Exploring novel conical singularity networks
• Line-of-sight mass estimator and the masses of the Milky Way and Andromeda Galaxy
• Prospects for annihilating dark matter from M31 and M33 observations with the Cherenkov Telescope Array
• Study of Various Dark Matter Halo Profiles in Milky Way and M31 Galaxies within the Standard Cosmology Framework
• Inferring halo masses with Graph Neural Networks
• NIHAO-LG: The uniqueness of Local Group dwarf galaxies
• Rotational Curves of the Milky Way Galaxy and Andromeda Galaxy in Light of Vacuum Polarization around Eicheon
• Assessing the Impact of Hydrogen Absorption on the Characteristics of the Galactic Center Excess