Radial Acceleration Structure in Disk and Early-Type Galaxies: A Combined Membrane–Halo and Schwarzschild Analysis
Year: 2025
Type: article
Abstract: This study presents a unified empirical dynamical analysis combining rotation-curve based Membrane–Halo models for 191 late-type galaxies with Schwarzschild-based acceleration reconstructions for 260 ATLAS3D early-type galaxies. Using a homogeneous radial pipeline, we extract at the outermost measured radius the baryonic acceleration, observed acceleration, dark-matter contribution, dark-matter fraction, and the empirical acceleration ratio.We identify a continuous dynamical sequence linking rotation-supported disks and dispersion-supported ellipticals. A joint regression yields a nearly universal relation between observed and baryonic acceleration. A tight correlation between halo mass and baryonic mass also holds across both samples.The combined behaviour indicates a common underlying dynamical scaling shared by disk-dominated and dispersion-dominated galaxies, consistent with the scale-free interpretation discussed in Paper 1.
Author: Pedde, Reinhold
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7108607129
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