Dark matter-baryon scaling relations from Einasto halo fits to SPARC galaxy rotation curves

Abstract

Dark matter-baryon scaling relations in galaxies are important in order to constrain galaxy formation models. Here, we provide a modern quantitative assessment of those relations, by modelling the rotation curves of galaxies from the Spitzer Photometry and Accurate Rotation Curves (SPARC) database with the Einasto dark halo model. We focus in particular on the comparison between the original SPARC parameters, with constant mass-to-light ratios for bulges and disks, and the parameters for which galaxies follow the tightest radial acceleration relation. We show that fits are improved in the second case, and that the pure halo scaling relations also become tighter. We report that the density at the radius where the slope is -2 is strongly anticorrelated to this radius, and to the Einasto index. The latter is close to unity for a large number of galaxies, indicative of large cores. In terms of dark matter-baryon scalings, we focus on relations between the core properties and the extent of the baryonic component, which are relevant to the cusp-core transformation process. We report a positive correlation between the core size of halos with small Einasto index and the stellar disk scale-length, as well as between the averaged dark matter density within 2 kpc and the baryon-induced rotational velocity at that radius. This finding is related to the consequence of the radial acceleration relation on the diversity of rotation curve shapes, quantified by the rotational velocity at 2 kpc. While a tight radial acceleration relation slightly decreases the observed diversity compared to the original SPARC parameters, the diversity of baryon-induced accelerations at 2 kpc is sufficient to induce a large diversity, incompatible with current hydrodynamical simulations of galaxy formation, while maintaining a tight radial acceleration relation.

arXiv commentAccepted for publication in Astronomy and Astrophysics; 29 pages, 12 figures

References in corpus (48)

• emcee: The MCMC Hammer
• Planck 2015 results. XIII. Cosmological parameters
• The Structure of Cold Dark Matter Halos
• Small-Scale Challenges to the $\Lambda$CDM Paradigm
• The Inner Structure of LambdaCDM Halos III: Universality and Asymptotic Slopes
• Cold dark matter haloes in the Planck era: evolution of structural parameters for Einasto and NFW profiles
• Modified Newtonian Dynamics (MOND): Observational Phenomenology and Relativistic Extensions
• The Baryonic Tully-Fisher Relation
• How supernova feedback turns dark matter cusps into cores
• SPARC: Mass Models for 175 Disk Galaxies with Spitzer Photometry and Accurate Rotation Curves
• Concentration, Spin and Shape of Dark Matter Haloes as a Function of the Cosmological Model: WMAP1, WMAP3 and WMAP5 results
• The Radial Acceleration Relation in Rotationally Supported Galaxies
• Analytical Models For Galactic Nuclei
• The Cores of Dwarf Galaxy Halos
• The cored distribution of dark matter in spiral galaxies
• Emergent Gravity and the Dark Universe
• The Spitzer Survey of Stellar Structure in Galaxies (S^4G)
• The unexpected diversity of dwarf galaxy rotation curves
• Making Galaxies in a Cosmological Context: The Need for Early Stellar Feedback
• A constant dark matter halo surface density in galaxies
• One Law To Rule Them All: The Radial Acceleration Relation of Galaxies
• Dark matter cores all the way down
• A mass-dependent density profile for dark matter haloes including the influence of galaxy formation
• High-resolution dark matter density profiles of THINGS dwarf galaxies: Correcting for non-circular motions
• The small scatter of the baryonic Tully-Fisher relation
• How the Self-Interacting Dark Matter Model Explains the Diverse Galactic Rotation Curves
• Color--Mass-to-Light Ratio Relations for Disk Galaxies
• Dark matter heats up in dwarf galaxies
• The rotation curves shapes of late-type dwarf galaxies
• MaGICC Disks: Matching Observed Galaxy Relationships Over a Wide Stellar Mass Range
• Fitting the radial acceleration relation to individual SPARC galaxies
• Non-circular motions and the diversity of dwarf galaxy rotation curves
• Milky Way Mass Models and MOND
• The Mass-Discrepancy Acceleration Relation: a Natural Outcome of Galaxy Formation in Cold Dark Matter halos
• The Relation between Stellar and Dynamical Surface Densities in the Central Regions of Disk Galaxies
• The mass discrepancy acceleration relation in a $\Lambda$CDM context
• Cores of Dark Matter Halos Correlate with Disk Scale Lengths
• A statistical investigation of the mass discrepancy-acceleration relation
• Improved Modeling of the Mass Distribution of Disk Galaxies by the Einasto Halo Model
• NIHAO XIV: Reproducing the observed diversity of dwarf galaxy rotation curve shapes in LCDM
• Λ CDM is Consistent with SPARC Radial Acceleration Relation
• The scatter, residual correlations and curvature of the SPARC baryonic Tully-Fisher relation
• Stellar Populations and the Star Formation Histories of LSB Galaxies: III. Stellar Population Models
• A scaling-relation for disc galaxies: circular-velocity gradient versus central surface brightness
• A constant characteristic volume density of dark matter haloes from SPARC rotation curve fits
• The Third Law of Galactic Rotation
• MOND as a regime of quantum gravity
• Emergence of the mass discrepancy-acceleration relation from dark matter-baryon interactions

Cited by in corpus (28)

• From galactic bars to the Hubble tension: weighing up the astrophysical evidence for Milgromian gravity
• Baryonic clues to the puzzling diversity of dwarf galaxy rotation curves
• Peak star formation efficiency and no missing baryons in massive spirals
• Dark Matter Cores and Cusps in Spiral Galaxies and their Explanations
• Search for dark matter towards the Galactic Centre with 11 years of ANTARES data
• Galaxy disc scaling relations: A tight linear galaxy -- halo connection challenges abundance matching
• Dark matter halo cores and the tidal survival of Milky Way satellites
• The MUSE Extremely Deep Field: Evidence for SFR-induced cores in dark-matter dominated galaxies at z=1
• Massive disc galaxies in cosmological hydrodynamical simulations are too dark matter-dominated
• Barred spiral galaxies in modified gravity theories
• The Einasto model for dark matter haloes
• On the tension between the Radial Acceleration Relation and Solar System quadrupole in modified gravity MOND
• The phantom dark matter halos of the Local Volume in the context of modified Newtonian dynamics
• Solar System limits on gravitational dipoles
• Baryon-Interacting Dark Matter: heating dark matter and the emergence of galaxy scaling relations
• The radial acceleration relation and dark baryons in MOND
• Modelling Einstein cluster using Einasto profile
• Scale-invariant dynamics in the Solar System
• Dipolar dark matter simulations on galaxy scales with the RAMSES code
• HI 21 cm observation and mass models of the extremely thin galaxy FGC 1440
• Simulations of cluster ultra-diffuse galaxies in MOND
• MUSE-DARK III: The evolution of the radial acceleration relation at intermediate redshifts
• On the radial acceleration of disk galaxies
• The $\kappa$-model under test of the SPARC database
• Renzo's rule revisited: A statistical study of galaxies' baryon - dark matter coupling
• On the Presence of Angular-Velocity Offsets in Disk Galaxies
• A framework for creating galaxy models in the geometry of the conservation group with dark matter halos and flat rotation curves
• Improved constraints on modified Newtonian gravity from Cassini radio tracking data