The Link between the Baryonic Mass Distribution and the Rotation Curve Shape

Abstract

The observed rotation curves of disc galaxies, ranging from late-type dwarf galaxies to early-type spirals, can be fit remarkably well simply by scaling up the contributions of the stellar and HI discs. This `baryonic scaling model' can explain the full breadth of observed rotation curves with only two free parameters. For a small fraction of galaxies, in particular early-type spiral galaxies, HI scaling appears to fail in the outer parts, possibly due to observational effects or ionization of the HI. The overall success of the baryonic scaling model suggests that the well-known global coupling between the baryonic mass of a galaxy and its rotation velocity (known as the baryonic Tully-Fisher relation), applies at a more local level as well, and it seems to imply a link between the baryonic mass distribution and the distribution of total mass (including dark matter).

10 pages, accepted for publication in MNRAS

References in corpus (4)

• High-Resolution Rotation Curves and Galaxy Mass Models from THINGS
• The rotation curves shapes of late-type dwarf galaxies
• The mass distribution in early-type disk galaxies: declining rotation curves and correlations with optical properties
• The stellar mass distribution in early-type disk galaxies: surface photometry and bulge-disk decompositions

Cited by in corpus (31)

• One Law To Rule Them All: The Radial Acceleration Relation of Galaxies
• Fitting the radial acceleration relation to individual SPARC galaxies
• The Relation between Stellar and Dynamical Surface Densities in the Central Regions of Disk Galaxies
• Baryonic clues to the puzzling diversity of dwarf galaxy rotation curves
• Gas dynamics in tidal dwarf galaxies: disc formation at z=0
• The mass discrepancy acceleration relation in a $\Lambda$CDM context
• Automated Kinematic Modelling of Warped Galaxy Discs in Large Hi Surveys: 3D Tilted Ring Fitting of HI Emission Cubes
• Dark matters on the scale of galaxies
• Predictions and Outcomes for the Dynamics of Rotating Galaxies
• Combining Stellar Populations with Orbit-Superposition Dynamical Modelling - the Formation History of the Lenticular Galaxy NGC 3115
• The Third Law of Galactic Rotation
• Dark matter in galaxies
• Gas dynamics in dwarf galaxies as testbeds for dark matter and galaxy evolution
• The diversity of rotation curves of simulated galaxies with cusps and cores
• Linear relation between HI circular velocity and stellar velocity dispersion in early-type galaxies, and slope of the density profiles
• Mass models of the Milky Way and estimation of its mass from the GAIA DR3 data-set
• Halpha Kinematics of S4G Spiral Galaxies - III. Inner rotation curves
• Challenges for Lambda-CDM and MOND
• A New Algorithm to Quantify Maximum Discs in Galaxies
• The relationship between the neutral hydrogen and dark mass in the galaxies
• The Baryonic Collapse Efficiency of Galaxy Groups in the RESOLVE and ECO Surveys
• Galaxy rotation curves disfavor traditional and self-interacting dark matter halos, preferring a disk component or Einasto function
• Dynamical Regularities in Galaxies
• Exploring the Dark Matter Disc Model in Dwarf Galaxies: Insights from the LITTLE THINGS Sample
• Dynamics of galaxies and clusters in \textit{refracted gravity}
• Astrophysical Constraints on Dark Energy
• The Effects of Inertial Forces on the Dynamics of Disk Galaxies
• General circular velocity relation of a test particle in a 3D gravitational potential: application to the rotation curves analysis and total mass determination of UGC 8490 and UGC 9753
• The "Graviton Picture": a Bohr Model for Gravitation on Galactic Scales?
• Absorption spectra of electrified hydrogen molecules
• The baryonic self similarity of dark matter