The cored distribution of dark matter in spiral galaxies

Abstract

We present the HI data for 5 spiral galaxies that, along with their Halpha rotation curves, are used to derive the distribution of dark matter within these objects. A new method for extracting rotation curves from HI data cubes is presented; this takes into account the existence of a warp and minimises projection effects. The rotation curves obtained are tested by taking them as input to construct model data cubes that are compared to the observed ones: the agreement is excellent. On the contrary, the model data cubes built using rotation curves obtained with standard methods, such as the first-moment analysis, fail the test. The HI rotation curves agree well with the Halpha data, where they coexist. Moreover, the combined Halpha + HI rotation curves are smooth, symmetric and extended to large radii. The rotation curves are decomposed into stellar, gaseous and dark matter contributions and the inferred density distribution is compared to various mass distributions: dark haloes with a central density core, $\Lambda$ Cold Dark Matter ($\Lambda$CDM) haloes (NFW, Moore profiles), HI scaling and MOND. The observations point to haloes with constant density cores of size $r_{core}\sim r_{opt}$ and central densities scaling approximately as ${\rho }_0\propto r_{core}^{-2/3}$. $\Lambda$CDM models (which predict a central cusp in the density profile) are in clear conflict with the data. HI scaling and MOND cannot account for the observed kinematics: we find some counter-examples.

23 pages, 15 figures, MNRAS accepted. Comments welcome. Version with Figs. 1 and 3 at full resolution available at http://www.astro.uni-bonn.de/~ggentile/paper_highres.ps.gz

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• Gravitational and distributed heating effects of a cD galaxy on the hydrodynamical structure of its host cluster
• Subdominant Dark Matter sterile neutrino resonant production in the light of Planck
• Using Strong Lensing to Detect Subhalos with Steep Inner Density Profiles
• The dynamical lineage of field ultra-diffuse galaxies
• A Relativistic Tensorial Model for Fractional Interaction between Dark Matter and Gravity
• Dark-Matter Content of Early-Type Galaxies with Planetary Nebulae
• Biases in inferring dark matter profiles from dynamical and lensing measurements
• Cusped Mass Density Profiles and Magnification Ratios of Double Image Gravitational Lenses
• Self-Interacting Dark Matter with Mass Segregation: A Unified Explanation of Dwarf Cores and Small-Scale Lenses
• Supplying Dark Energy from Scalar Field Dark Matter
• WIMP decay as a possible Warm Dark Matter model
• Dark Matter Universal Properties in Galaxies
• The effect of redshift degeneracy and the damping effect of viscous medium on the information extracted from gravitational wave signals
• Spectral Observations of Superthin Galaxies
• Beyond single tracers: CNN-based inference of galaxy mass profiles from combined gas and stellar kinematics
• Lensing in matched exterior and interior Kottler solutions
• Uncertainty-Aware Neural Networks for Fuzzy Dark Matter Model Selection from \texorpdfstring{$x_{\mathrm{HI}}$}{x_HI} Measurements
• Calibrating the SIDM Gravothermal Catastrophe with N-body Simulations
• A Modified Mass Concept could explain both the Dark Matter and the Dark Energy Phenomenon
• Considerations on supersymmetric Dark Matter beyond the MSSM
• Dark Matter Phase Transition Constrained at O(0.1) eV with LSB Rotation Curves
• A probabilistic deep learning model to distinguish cusps and cores in dwarf galaxies
• Probing Dark Matter with Strong Gravitational Lensing through an Effective Density Slope
• The dark matter content of early-type barred galaxies
• Detecting a physical difference between the CDM halos in simulation and in nature
• Combined analyses of the antiproton production from cosmic-ray interactions and its possible dark matter origin
• Comparison of Modeling SPARC spiral galaxies' rotation curves: halo models vs MOND
• Cosmological constraints on sterile neutrino Dark Matter production mechanisms