The origin and tidal evolution of cuspy triaxial haloes

Abstract

We present a technique for constructing equilibrium triaxial N-body haloes with nearly arbitrary density profiles, axial ratios and spin parameters. The method is based on the way in which structures form in hierarchical cosmological simulations, where prolate and oblate haloes form via mergers with low and high angular momentum, respectively. We show that major mergers between equilibrium spherical cuspy haloes produce similarly cuspy triaxial remnants and higher angular-momentum mergers produce systems with lower concentrations. Triaxial haloes orbiting within deeper potentials become more spherical and their velocity dispersion tensors more isotropic. The rate of mass loss depends sensitively on the halo shape: a prolate halo can lose mass at a rate several times higher than an isotropic spherical halo with the same density profile. Subhaloes within cosmological simulations are significantly rounder than field haloes with axial ratios that are ~ 30% larger.

Accepted for publication in MNRAS, 8 pages, 8 figures, LaTeX (uses mn2e.cls)

References in corpus (39)

• The Structure of Cold Dark Matter Halos
• Profiles of dark haloes: evolution, scatter, and environment
• Concentrations of Dark Halos from their Assembly Histories
• A 2MASS All-Sky View of the Sagittarius Dwarf Galaxy: I. Morphology of the Sagittarius Core and Tidal Arms
• Triaxial Modeling of Halo Density Profiles with High-resolution N-body Simulations
• The Structure of Dark Matter Haloes in Hierarchical Clustering Models
• Mass Density Profiles of LSB Galaxies
• The Power Spectrum Dependence of Dark Matter Halo Concentrations
• Great Circle tidal streams: evidence for a nearly spherical massive dark halo around the Milky Way
• Statistical Properties of Collisionless Equal- and Unequal-Mass Merger Remnants of Disk Galaxies
• Halo Substructure And The Power Spectrum
• The Central Mass Distribution in Dwarf and Low Surface Brightness Galaxies
• The Structural Evolution of Substructure
• Multiscale Gaussian Random Fields for Cosmological Simulations
• The origin of angular momentum in dark matter halos
• Velocity and spatial biases in CDM subhalo distributions
• The Effect of Gas Cooling on the Shapes of Dark Matter Halos
• Testing the Dark Matter Hypothesis with Low Surface Brightness Galaxies and Other Evidence
• The Origin of the Brightest Cluster Galaxies
• Constraints on the Structure of Dark Matter Halos from the Rotation Curves of Low Surface Brightness Galaxies
• Generating Equilibrium Dark Matter Halos: Inadequacies of the Local Maxwellian Approximation
• Measuring non-axisymmetry in spiral galaxies
• On the Life and Death of Satellite Haloes
• Tidal Streams as Probes of the Galactic Potential
• Triaxial Galaxies with Cusps
• Chandra Evidence for a Flattened, Triaxial Dark Matter Halo in the Elliptical Galaxy NGC 720
• Geometrical Evidence for Dark Matter: X-ray Constraints on the Mass of the Elliptical Galaxy NGC 720
• Dark matter in Draco and the Local Group: Implications for direct detection experiments
• Velocity bias in a LCDM model
• Tidal debris of dwarf spheroidals as a probe of structure formation models
• Global Properties of Multiple Merger Remnants
• Major Mergers of Galaxy Haloes: Cuspy or Cored Inner Density Profile?
• The edge-on spiral gravitational lens B1600+434
• Shapes of dark matter halos
• Models of Cuspy Triaxial Galaxies
• Polar Ring Galaxies and the Tully Fisher relation: implications for the dark halo shape
• Efficient N-body Realisations of axisymmetric Galaxies and Haloes
• X-ray Constraints on the Intrinsic Shape of the Lenticular Galaxy NGC 1332
• Halo Tracing with Atomic Hydrogen

Cited by in corpus (55)

• Cold Dark Matter Substructure and Galactic Disks I: Morphological Signatures of Hierarchical Satellite Accretion
• Equilibrium Disk-Bulge-Halo Models for the Milky Way and Andromeda Galaxies
• The Distribution of Satellite Galaxies: The Great Pancake
• A universal density slope - velocity anisotropy relation for relaxed structures
• The Causes of Halo Shape Changes Induced by Cooling Baryons: Disks Versus Substructures
• The distribution and kinematics of early high-sigma peaks in present-day haloes: implications for rare objects and old stellar populations
• Dynamical Centers and Non-Circular Motions in THINGS Galaxies: Implications for Dark Matter Halos
• Cold Dark Matter Substructure and Galactic Disks II: Dynamical Effects of Hierarchical Satellite Accretion
• Cosmic Ménage à Trois: The Origin of Satellite Galaxies On Extreme Orbits
• The shape of the Galactic halo with $Gaia$ DR2 RR Lyrae. Anatomy of an ancient major merger
• Dissipationless Mergers of Elliptical Galaxies and the Evolution of the Fundamental Plane
• Full calculation of clumpiness boost factors for antimatter cosmic rays in the light of Lambda-CDM N-body simulation results
• Angular momentum transport and disk morphology in SPH simulations of galaxy formation
• The Robustness of Dark Matter Density Profiles in Dissipationless Mergers
• The Orbital Evolution Induced by Baryonic Condensation in Triaxial Halos
• Recovering cores and cusps in dark matter haloes using mock velocity field observations
• What's Up in the Milky Way? The Orientation of the Disc Relative to the Triaxial Halo
• The Sphericalization of Dark Matter Halos by Galaxy Disks
• Kinematics of hypervelocity stars in the triaxial halo of the Milky Way
• Stellar Bar Evolution in Cuspy and Flat-Cored Triaxial CDM Halos
• Tidal debris in elliptical galaxies as tracers of mergers with disks
• Extreme AGN Feedback and Cool Core Destruction in the X-ray Luminous Galaxy Cluster MACS J1931.8-2634
• Multimass spherical structure models for N-body simulations
• The phase-space structure of tidally stripped halos
• The dark matter halos of the bluest low surface brightness galaxies
• The Smith Cloud and its dark matter halo: Survival of a Galactic disc passage
• Mass loss in tidally stripped systems; the energy-based truncation method
• Internal Alignments of Red Versus Blue Discs in Dark Matter Halos
• Cosmological Three-Point Function: Testing The Halo Model Against Simulations
• On the equilibrium morphology of systems drawn from spherical collapse experiments
• Tidal Torquing of Elliptical Galaxies in Cluster Environments
• Baryonic impact on the dark matter orbital properties of Milky Way-sized haloes
• Baryons Shaping Dark Matter Haloes
• The Three Hundred project: galaxy cluster mergers and their impact on the stellar component of brightest cluster galaxies
• Exploring the diversity and similarity of radially anisotropic Milky Way-like stellar haloes: implications for disrupted dwarf galaxy searches
• Major mergers between dark matter haloes -- II. Profile and concentration changes
• Spherical Cows in Dark Matter Indirect Detection
• Nonlinear Color-Metallicity Relations of Globular Clusters. VIII. Reproducing Color Distributions of Individual Globular Cluster Systems in the Virgo and Fornax Galaxy Clusters
• Dark Matter Halos from the Inside Out
• Major mergers between dark matter haloes -- I. Predictions for size, shape, and spin
• EDGE: The shape of dark matter haloes in the faintest galaxies
• Statistical properties of dark matter mini-haloes at z >= 15
• Merger of Massive Black Holes using N-Body Simulations with Post-Newtonian Corrections
• Order and chaos in a new 3D dynamical model describing motion in non axially symmetric galaxies
• Evolution of Dark Matter Phase-Space Density Distributions in Equal-Mass Halo Mergers
• Dynamical Models for Disk Galaxies with Triaxial Halos
• Searching for dark matter annihilation from individual halos: uncertainties, scatter and signal-to-noise ratios
• The tilting rate of the Milky Way's disc
• Particle ejection during mergers of dark matter halos
• Measuring the Galaxy-Galaxy-Mass Three-point Correlation Function with Weak Gravitational Lensing
• Made-To-Measure Models of Self-Similar Triaxial Halos with Steep Inner Density Gradients
• A MARVEL-ous study of how well galaxy shapes reflect Dark Matter halo shapes in Cold Dark Matter Simulations
• Order and chaos in a three dimensional galaxy model
• A Random Walk Model for Halo Triaxiality
• Chemodynamics of BoötesI with $S^5$: Revised Velocity Gradient, Dark Matter Density, and Galactic Chemical Evolution Constraints