Milky Way and M31 rotation curves: $\Lambda$CDM vs. MOND

Abstract

We analyze the existing rotation-curve data of the Milky Way and M31 galaxies that extends to very large distances and low accelerations. We find a systematic downward trend in the weak acceleration (large distances) segment of the radial acceleration. A similar downward trend has been noticed in the $\Lambda$CDM EAGLE simulation, while the deviation from the generic MOND prediction would need to be ascribed to an external field effect, or possibly a post facto selected acceleration function $\mu (x)$.

4 figures, 8 pages, accepted by PRD

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Cited by in corpus (7)

• On the Outskirts of Dark Matter Haloes
• Study of Various Dark Matter Halo Profiles in Milky Way and M31 Galaxies within the Standard Cosmology Framework
• The modified Newtonian dynamics with an extra anti-dissipation term can yield the MOND model
• Rotational Curves of the Milky Way Galaxy and Andromeda Galaxy in Light of Vacuum Polarization around Eicheon
• Nonlocal Gravity: Modification of Newtonian Gravitational Force in the Solar System
• Determination of the best dark matter profile for the Milky Way with Gaia DR3 using Bayesian Model Comparison
• Testing MOND using the dynamics of nearby stellar streams