Flat circular velocities on a megaparsec scale from the ΛCDM model

Antonino DEL POPOLO, Man Ho CHAN

Research output: Contribution to journalArticlespeer-review

Abstract

A recent study using weak gravitational lensing reveals that there are some isolated galaxies with almost flat rotation curves at very large distances from the galactic centers. According to the authors of the study, this provides a strong challenge to 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 by improving their model, the virial radius is larger than their estimates. The Navarro-Frenk-White 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. Copyright © 2025 The Author(s). Published by the American Astronomical Society.

Original languageEnglish
Article number127
JournalAstrophysical Journal
Volume984
Issue number2
DOIs
Publication statusPublished - May 2025

Citation

Del Popolo, A., & Chan, M. H. (2025). Flat circular velocities on a megaparsec scale from the ΛCDM model. The Astrophysical Journal, 984(2), Article 127. https://doi.org/10.3847/1538-4357/adcc1c

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