Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

On the Dynamics of Rotationally Supported Galaxies

Version 1 : Received: 7 March 2019 / Approved: 8 March 2019 / Online: 8 March 2019 (09:58:33 CET)

How to cite: Suleiman, R. On the Dynamics of Rotationally Supported Galaxies. Preprints 2019, 2019030107. Suleiman, R. On the Dynamics of Rotationally Supported Galaxies. Preprints 2019, 2019030107.


A recent finding, based on empirical data of 153 rotationally supported galaxies, with very different morphologies, masses, sizes, and gas fractions, revealed that the baryonic and the dark matter in galaxies are strongly coupled, such that, if the first is known, the second follows and vice versa. Here, we propose a completely theoretical analysis of the dynamics of rotationally supported galaxies, which results in the same conclusion. We find that the relationship between baryonic and dark matter densities at any radius r is governed by the law, ρ(r)_M + ρ(r)_DM = ρ_0, where ρ(r)_M, and ρ(r)_DM are, respectively, the densities of matter and dark matter at radius r, and ρ_0 is the density at the galaxy’s center. Strikingly, we also found that the radius r_s, at which the rotation velocity is equal to half of its maximal value, constitutes a vivid signature of the galaxy, in the sense that it reveals rich information about the galaxy’s dynamics, including the distribution of its matter and dark matter and their total amounts in the galaxy.


Dark matter; galaxies; galaxy rotation curve; radial acceleration relation.


Physical Sciences, Astronomy and Astrophysics

Comments (0)

We encourage comments and feedback from a broad range of readers. See criteria for comments and our Diversity statement.

Leave a public comment
Send a private comment to the author(s)
* All users must log in before leaving a comment
Views 0
Downloads 0
Comments 0
Metrics 0

Notify me about updates to this article or when a peer-reviewed version is published.
We use cookies on our website to ensure you get the best experience.
Read more about our cookies here.