On the fundamentality of the radial acceleration relation for late-type galaxy dynamics

Abstract

Galaxies have been observed to exhibit a level of simplicity unexpected in the complex galaxy formation scenario posited by standard cosmology. This is particularly apparent in their dynamics, where scaling relations display much regularity and little intrinsic scatter. However, the parameters responsible for this simplicity have not been identified. Using the Spitzer Photometry & Accurate Rotation Curves galaxy catalogue, we argue that the radial acceleration relation (RAR) between galaxies' baryonic and total dynamical accelerations is the fundamental $1$-dimensional correlation governing the radial (in-disk) dynamics of late-type galaxies. In particular, we show that the RAR cannot be tightened by the inclusion of any other available galaxy property, that it is the strongest projection of galaxies' radial dynamical parameter space, and that all other statistical radial dynamical correlations stem from the RAR plus the non-dynamical correlations present in our sample. We further provide evidence that the RAR's fundamentality is unique in that the second most significant dynamical relation does not possess any of these features. Our analysis reveals the root cause of the correlations present in galaxies' radial dynamics: they are nothing but facets of the RAR. These results have important ramifications for galaxy formation theory because they imply that to explain statistically late-type galaxy dynamics within the disk it is necessary and sufficient to explain the RAR and lack of any significant, partially independent correlation. While simple in some modified dynamics models, this poses a challenge to standard cosmology.

17 pages, 9 figures. Accepted in MNRAS

References in corpus (35)

• SPARC: Mass Models for 175 Disk Galaxies with Spitzer Photometry and Accurate Rotation Curves
• One Law To Rule Them All: The Radial Acceleration Relation of Galaxies
• The Fundamental Properties of Galaxies and a New Galaxy Classification System
• The Tully-Fisher Relation and Its Residuals for a Broadly Selected Sample of Galaxies
• Extreme Value Statistics of the Halo and Stellar Mass Distributions at High Redshift: are JWST Results in Tension with ΛCDM?
• A Tale of Two Paradigms: the Mutual Incommensurability of LCDM and MOND
• LITTLE THINGS in 3D: robust determination of the circular velocity of dwarf irregular galaxies
• The Relation between Stellar and Dynamical Surface Densities in the Central Regions of Disk Galaxies
• Robust HI kinematics of gas-rich ultra-diffuse galaxies: hints of a weak-feedback formation scenario
• From light to baryonic mass: the effect of the stellar mass-to-light ratio on the Baryonic Tully-Fisher relation
• A statistical investigation of the mass discrepancy-acceleration relation
• Λ CDM is Consistent with SPARC Radial Acceleration Relation
• A massive blow for $\Lambda$CDM $-$ the high redshift, mass, and collision velocity of the interacting galaxy cluster El Gordo contradicts concordance cosmology
• The Multi-Wavelength Tully-Fisher relation with spatially resolved HI kinematics
• Scientific Machine Learning through Physics-Informed Neural Networks: Where we are and What's next
• Galactic rotation curves, the baryon-to-dark-halo-mass relation and space-time scale invariance
• The Weak Lensing Radial Acceleration Relation: Constraining Modified Gravity and Cold Dark Matter theories with KiDS-1000
• The impact of gas disc flaring on rotation curve decomposition and revisiting baryonic and dark-matter relations for nearby galaxies
• Testing the Strong Equivalence Principle. II. Relating the External Field Effect in Galaxy Rotation Curves to the Large-Scale Structure of the Universe
• The Disagreement Problem in Explainable Machine Learning: A Practitioner's Perspective
• The radial acceleration relation in a $\Lambda$CDM universe
• Correlations among the properties of galaxies found in a blind HI survey, which also have SDSS optical data
• Numerical Solutions of the External Field Effect on the Radial Acceleration in Disk Galaxies
• Probing the radial acceleration relation and the strong equivalence principle with the Coma cluster ultra-diffuse galaxies
• COSMOS2020: Manifold Learning to Estimate Physical Parameters in Large Galaxy Surveys
• On the Presence of a Universal Acceleration Scale in Elliptical Galaxies
• Excitation of vertical breathing motion in disc galaxies by tidally-induced spirals in fly-by interactions
• From spirals to lenticulars: evidence from the rotation curves and mass models of three early-type galaxies
• ASPECT: A spectra clustering tool for exploration of large spectral surveys
• A test of Radial Acceleration Relation for the {\it Giles et al Chandra} cluster sample
• A test of constancy of dark matter halo surface density and radial acceleration relation in relaxed galaxy groups
• PROBES-I: A Compendium of Deep Rotation Curves and Matched multiband Photometry
• Testing Modified Gravity Theories with Numerical Solutions of the External Field Effect in Rotationally Supported Galaxies
• The phenomenology of the external field effect in cold dark matter models
• Correlation between Global Parameters of Galaxies

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• MUSE-DARK III: The evolution of the radial acceleration relation at intermediate redshifts
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