Flat Circular Velocities on a megaparsec scale from the ΛCDM model

2025/04/17 by Antonino Del Popolo, Del Popolo, Antonino, Man Ho Chan +1
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics of Galaxies (astro-ph.GA) #Cosmology and Gravitation Theories #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena

paper · pdf · doi:10.48550/arxiv.2504.12662

openalex publication_date 2025/04/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

A recent study using weak gravitational lensing reveals that there are some isolated galaxies having almost flat rotation curves at very large distance from the galactic centres. According to the authors of the study this provides a strong challenge the standard cold dark matter model, since the dark haloes are too small to explain their observations, especially for small stellar masses. In this article, we show that improving their model, the virial radius is larger than their estimates. The NFW rotational curve, and especially the pseudo Isothermal one, are in agreement with their flat rotational curves, especially for the larger baryonic mass bins used by the authors.

Citations

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Related

• Testing dark matter and geometry sustained circular velocities in the Milky Way with Gaia DR2
• The Cosmological Significance of Disk Galaxy Rotation Curves
• The shape of rotation curves: models vs. observations
• Rotation curves of spiral galaxies: A general-relativistic model
• Pseudo Rotation Curve Connecting the Galaxy, Dark Halo, and Local Group