On the Structure of Dark Matter Halos at the Damping Scale of the Power Spectrum with and without Relict Velocities

Abstract

We report a series of high-resolution cosmological N-body simulations designed to explore the formation and properties of dark matter halos with masses close to the damping scale of the primordial power spectrum of density fluctuations. We further investigate the effect that the addition of a random component, v_rms, into the particle velocity field has on the structure of halos. We adopted as a fiducial model the Lambda Warm Dark Matter cosmology with a non-thermal sterile neutrino mass of 0.5 keV. The filtering mass corresponds then to M_f = 2.6x10^12 M_sun/h. Halos of masses close to M_f were simulated with several million of particles. The results show that, on one hand, the inner density slope of these halos (at radii <~0.02 the virial radius Rvir) is systematically steeper than the one corresponding to the NFW fit or to the CDM counterpart. On the other hand, the overall density profile (radii larger than 0.02Rvir) is less curved and less concentrated than the NFW fit, with an outer slope shallower than -3. For simulations with v_rms, the inner halo density profiles flatten significantly at radii smaller than 2-3 kpc/h (<~0.010-0.015Rvir). A constant density core is not detected in our simulations, with the exception of one halo for which the flat core radius is ~1 kpc/h. Nevertheless, if ``cored'' density profiles are used to fit the halo profiles, the inferred core radii are ~0.1-0.8 kpc/h, in rough agreement with theoretical predictions based on phase-space constrains, and on dynamical models of warm gravitational collapse. A reduction of v_rms by a factor of 3 produces a modest decrease in core radii, less than a factor of 1.5. We discuss the extension of our results into several contexts, for example, to the structure of the cold DM micro-halos at the damping scale of this model.

arXiv comment13 pages, 6 figures, accepted for publication in The Astrophysical Journal

References in corpus (69)

• A Universal Density Profile from Hierarchical Clustering
• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Dark Matter Substructure in Galactic Halos
• Where are the missing galactic satellites?
• Profiles of dark haloes: evolution, scatter, and environment
• Observational evidence for self-interacting cold dark matter
• Cold collapse and the core catastrophe
• Halo Formation in Warm Dark Matter Models
• The Inner Structure of LambdaCDM Halos III: Universality and Asymptotic Slopes
• Cosmological parameter analysis including SDSS Ly-alpha forest and galaxy bias: constraints on the primordial spectrum of fluctuations, neutrino mass, and dark energy
• The Kinematics of the Ultra-Faint Milky Way Satellites: Solving the Missing Satellite Problem
• The Dark Side of the Halo Occupation Distribution
• Constraining Warm Dark Matter candidates including sterile neutrinos and light gravitinos with WMAP and the Lyman-alpha forest
• Reionization and the abundance of galactic satellites
• The large-scale structure of the Universe
• Adaptive Refinement Tree - a new high-resolution N-body code for cosmological simulations
• Analytical Models For Galactic Nuclei
• Forming Disk Galaxies in Lambda CDM Simulations
• Mass Density Profiles of LSB Galaxies
• Galaxies in N-body simulations: overcoming the overmerging problem
• The Observed properties of Dark Matter on small spatial scales
• The Power Spectrum Dependence of Dark Matter Halo Concentrations
• Resolving the Structure of Cold Dark Matter Halos II
• Earth-mass dark-matter haloes as the first structures in the early Universe
• Superweakly Interacting Massive Particles
• Substructure and halo density profiles in a Warm Dark Matter Cosmology
• The Effects of Photoionization on Galaxy Formation - II: Satellites in the Local Group
• The Phase-Space Density Profiles of Cold Dark Matter Halos
• Does the Fornax dwarf spheroidal have a central cusp or core?
• Formation and structure of halos in a warm dark matter cosmology
• Convergence and scatter of cluster density profiles
• Discreteness effects in simulations of Hot/Warm dark matter
• What mass are the smallest protohalos?
• Can sterile neutrinos be ruled out as warm dark matter candidates?
• Cusps in CDM halos
• Flat-Cored Dark Matter in Cuspy Clusters of Galaxies
• New Dark Matter Physics: Clues from Halo Structure
• Lyman-alpha Forest Constraints on the Mass of Warm Dark Matter and the Shape of the Linear Power Spectrum
• Gravitino Dark Matter and Cosmological Constraints
• How universal are the density profiles of dark halos?
• Dark Matter from Early Decays
• Production and Evolution of Perturbations of Sterile Neutrino Dark Matter
• Density profiles of LCDM clusters
• Is there Evidence for Flat Cores in the Halos of Dwarf Galaxies?: The Case of NGC 3109 and NGC 6822
• The dwarf galaxy DDO 47 as a dark matter laboratory: testing cusps hiding in triaxial halos
• Early supersymmetric cold dark matter substructure
• Linear Cosmological Structure Limits on Warm Dark Matter
• Structure and Subhalo Population of Halos in a Self-Interacting Dark Matter Cosmology
• An extensive study of dynamical friction in dwarf galaxies: the role of stars, dark matter, halo profiles and MOND
• The rotation curves of dwarf galaxies: a problem for Cold Dark Matter?
• Dark matter in Draco and the Local Group: Implications for direct detection experiments
• Early structure in LCDM
• The Robustness of Dark Matter Density Profiles in Dissipationless Mergers
• Density profiles of dark matter haloes: diversity and dependence on environment
• A Large Dark Matter Core in the Fornax Dwarf Spheroidal Galaxy?
• Phase-space mixing and the merging of cusps
• Hiding Cusps in Cores: Kinematics of Disk Galaxies in Triaxial Dark Matter Halos
• Merger Histories in Warm Dark Matter Structure Formation Scenario
• The Bar--Halo Interaction--I. From Fundamental Dynamics to Revised N-body Requirements
• Dark Matter Halos with Cores from Hierarchical Structure Formation
• Are Halos of Collisionless Cold Dark Matter Collisionless?
• Resonances in Barred Galaxies
• LambdaCDM Halo Density Profiles: where do actual halos converge to NFW ones?
• Bars and Cold Dark Matter Halos
• Top-Down Fragmentation of a Warm Dark Matter Filament
• Galaxy Formation: Warm Dark Matter, Missing Satellites, and the Angular Momentum Problem
• The Asymptotic Form of Cosmic Structure: Small Scale Power and Accretion History
• Gravitational Instability in Collisionless Cosmological Pancakes
• Bar-Halo Friction in Galaxies III: Particle Number Requirements for Simulations

Cited by in corpus (85)

• The role of sterile neutrinos in cosmology and astrophysics
• Cuspy No More: How Outflows Affect the Central Dark Matter and Baryon Distribution in Lambda CDM Galaxies
• The properties of warm dark matter haloes
• Lyman-alpha constraints on warm and on warm-plus-cold dark matter models
• Sterile Neutrino Dark Matter
• A universal model for halo concentrations
• The Phenomenology of Right Handed Neutrinos
• Dark Matter, Baryogenesis and Neutrino Oscillations from Right Handed Neutrinos
• Nonlinear Evolution of Cosmological Structures in Warm Dark Matter Models
• Cores in warm dark matter haloes: a Catch 22 problem
• The velocity function in the local environment from LCDM and LWDM constrained simulations
• Large-scale dark matter simulations
• Dark matter substructure and dwarf galactic satellites
• High-Resolution Simulation on Structure Formation with Extremely Light Bosonic Dark Matter
• The Warm DM halo mass function below the cut-off scale
• The Effect of Thermal Neutrino Motion on the Non-linear Cosmological Matter Power Spectrum
• Using the Milky Way satellites to study interactions between cold dark matter and radiation
• The COpernicus COmplexio: Statistical Properties of Warm Dark Matter Haloes
• Hierarchical Formation of Dark Matter Halos and the Free Streaming Scale
• Constraints on dark matter scenarios from measurements of the galaxy luminosity function at high redshifts
• Internal kinematics and dynamical models of dwarf spheroidal galaxies around the Milky Way
• Testing the Warm Dark Matter paradigm with large-scale structures
• Hints on the Nature of Dark Matter from the Properties of Milky Way Satellites
• Halo bias in mixed dark matter cosmologies
• The inner structure of haloes in Cold+Warm dark matter models
• Gamma-ray Signal from Earth-mass Dark Matter Microhalos
• The Case Against Warm or Self-Interacting Dark Matter as Explanations for Cores in Low Surface Brightness Galaxies
• How cold is Dark Matter? Constraints from Milky Way Satellites
• The phase space density of fermionic dark matter haloes
• Fermionic warm dark matter produces galaxy cores in the observed scales because of quantum mechanics
• Observational rotation curves and density profiles vs. the Thomas-Fermi galaxy structure theory
• The concentration-mass relation of clusters of galaxies from the OmegaWINGS survey
• Next decade of sterile neutrino studies
• Galaxy Formation in WDM Cosmology
• Discreteness Effects in Lambda Cold Dark Matter Simulations: A Wavelet-Statistical View
• Probing the nature of dark matter particles with stellar streams
• Cores and Cusps in Warm Dark Matter Halos
• Spherical collapse in $\nu \Lambda CDM$
• Resonant Sterile Neutrino Dark Matter in the Local and High-z Universe
• Cosmology: small scale issues revisited
• The Dynamics of Subhalos in Warm Dark Matter Models
• Addressing the too big to fail problem with baryon physics and sterile neutrino dark matter
• The sizes of mini-voids in the local universe: an argument in favor of a warm dark matter model?
• A fresh look into the interacting dark matter scenario
• Structure of Dark Matter Halos in Warm Dark Matter models and in models with Long-Lived Charged Massive Particles
• Neutrino clustering around spherical dark matter halos
• Warm dark matter primordial spectra and the onset of structure formation at redshift z
• Fingerprints of the initial conditions on the density profiles of cold and warm dark matter haloes
• The effect of Warm Dark Matter on galaxy properties: constraints from the stellar mass function and the Tully-Fisher relation
• Warm dark matter and the ionization history of the Universe
• The Non-Linear Matter Power Spectrum in Warm Dark Matter Cosmologies
• Dark Matter microphysics and 21 cm observations
• Constraints on mixed dark matter from anomalous strong lens systems
• Simulations of galaxies formed in warm dark matter halos of masses at the filtering scale
• A Dynamical Framework for KeV Dirac Neutrino Warm Dark Matter
• Strongly Coupled Dark Energy Cosmologies: preserving LCDM success and easing low scale problems II - Cosmological simulations
• Signatures of clumpy dark matter in the global 21 cm background signal
• Dynamical analysis of the dark matter and central black hole mass in the dwarf spheroidal Leo I
• Constraining warm dark matter with 21 cm line fluctuations due to minihalos
• Spurious Small-Scale Structure & Discreteness-Driven Relaxation in Cosmological Simulations
• The galaxy population in cold and warm dark matter cosmologies
• Endothermic self-interacting dark matter in Milky Way-like dark matter haloes
• The inner structure of dwarf sized halos in Warm and Cold Dark Matter cosmologies
• Typical density profile for warm dark matter haloes
• The Effect of Thermal Velocities on Structure Formation in N-body Simulations of Warm Dark Matter
• Seeking Observable Imprints of Small-Scale Structure on the Properties of Dark Matter Haloes
• Equation of state, universal profiles, scaling and macroscopic quantum effects in Warm Dark Matter galaxies
• Fluctuations in strongly coupled cosmologies
• Dark energy from dark radiation in strongly coupled cosmologies with no fine tuning
• A new framework for numerical simulations of structure formation
• Non-thermal Hot Dark Matter from Inflaton/Moduli Decay: The Momentum Distribution and Relaxing the Cosmological Mass Bound
• Degenerate Fermion Dark Matter from a Broken $U(1{)}_{\mathrm{B}-\mathrm{L}}$ Gauge Symmetry
• The signal of decaying dark matter with hydrodynamical simulations
• Warm Dark Matter Galaxies with Central Supermassive Black-Holes
• Impact of a Warm Dark Matter late-time velocity dispersion on large-scale structures
• Extended Stellar Components of Galaxies & the Nature of Dark Matter
• Spherical collapse of fuzzy dark matter
• Forecasts for Warm Dark Matter from Photometric Galaxy Surveys
• Hollow cores in Warm Dark Matter halos from the Vlasov-Poisson equation
• Constraining Dwarf Spheroidal Dark Matter Halos With The Galactic Center Excess
• Clues to the nature of dark matter from first galaxies
• Enhanced Small-Scale Structure in the Cosmic Dark Ages
• Using dust to constrain dark matter models
• Discreteness effects in $N$-body simulations of warm dark matter
• Is it possible to unify three kinds of Dark Matters into a Kaluza-Klein Neutrino?