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Why do galaxies have extended flat rotation curves?

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arxiv 2412.17869 v1 pith:LJUN3F3E submitted 2024-12-21 astro-ph.GA

Why do galaxies have extended flat rotation curves?

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keywords galaxiescurvesflatradiivelocityalreadyapproxbeyond
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Recent observations by Mistele et al. show that the circular velocity curves of isolated galaxies remain flat out to the largest radii probed so far, i.e. $\approx 1$ Mpc. The velocity decline beyond the expected virial radius is not observed. These results imply that the galaxy halo is in thermal equilibrium even at large radii where particles did not have time to relax. The galaxies must have already formed in the isothermal state. How is this possible? In the present note we try to understand the formation of galaxies with warm dark matter in the expanding universe.

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Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Testing CCC+TL Cosmology with Galaxy Rotation Curves

    astro-ph.CO 2025-09 reject novelty 5.0

    A covarying-coupling-constant cosmology with a locally varying parameter X is shown to reproduce the rotation curves of seven SPARC galaxies without dark matter, by fitting a single turn-off density parameter.