Nonlinear evolution of dark matter subhalos and applications to warm dark matter

Abstract

We describe the methodology to include nonlinear evolution, including tidal effects, in the computation of subhalo distribution properties in both cold (CDM) and warm (WDM) dark matter universes. Using semi-analytic modeling, we include effects from dynamical friction, tidal stripping, and tidal heating, allowing us to dynamically evolve the subhalo distribution. We calibrate our nonlinear evolution scheme to the CDM subhalo mass function in the Aquarius N-body simulation, producing a subhalo mass function within the range of simulations. We find tidal effects to be the dominant mechanism of nonlinear evolution in the subhalo population. Finally, we compute the subhalo mass function for $m_{\chi }=1.5$ keV WDM including the effects of nonlinear evolution, and compare radial number densities and mass density profiles of subhalos in CDM and WDM models. We show that all three signatures differ between the two dark matter models, suggesting that probes of substructure may be able to differentiate between them.

Added a couple of references

References in corpus (9)

• Too big to fail? The puzzling darkness of massive Milky Way subhaloes
• Constraints on the Self-Interaction Cross-Section of Dark Matter from Numerical Simulations of the Merging Galaxy Cluster 1E 0657-5
• The redshift dependence of the structure of massive LCDM halos
• Bayesian Strong Gravitational-Lens Modeling on Adaptive Grids: Objective Detection of Mass Substructure in Galaxies
• A fitting formula for the merger timescale of galaxies in hierarchical clustering
• Satellite Systems around Galaxies in Hydrodynamic Simulations
• Constraining Warm Dark Matter using QSO gravitational lensing
• On the common mass scale of the Milky Way satellites
• Tidal Mass Loss from Collisionless Systems

Cited by in corpus (21)

• Disruption of Dark Matter Substructure: Fact or Fiction?
• Dark Matter Substructure in Numerical Simulations: A Tale of Discreteness Noise, Runaway Instabilities, and Artificial Disruption
• Substructure of fuzzy dark matter haloes
• The tidal evolution of dark matter substructure -- I. Subhalo density profiles
• Symphony: Cosmological Zoom-in Simulation Suites over Four Decades of Host Halo Mass
• DASH: a library of dynamical subhalo evolution
• Tidal Stripping in the Adiabatic Limit
• Tidal Tracks and Artificial Disruption of Cold Dark Matter Halos
• The Normalization and Slope of the Dark Matter (Sub-)Halo Mass Function on Sub-Galactic Scales
• Tidal evolution of cored and cuspy dark matter halos
• Evolution of subhalo orbits in a smoothly-growing host halo potential
• On the dark matter haloes inner structure and galaxy morphology
• An Accurate Comprehensive Approach to Substructure: I. Accreted Subhaloes
• An Accurate Comprehensive Approach to Substructure: III. Masses and Formation Times of the Host Haloes
• An Accurate Comprehensive Approach to Substructure: II. Stripped Subhaloes
• Anisotropic strong lensing as a probe of dark matter self-interactions
• Faster than SAM: An empirical model for the tidal evolution of dark matter substructure around strong gravitational lenses
• The influence of dark matter halo on the stellar stream asymmetry via dynamical friction
• Semianalytic model for decaying dark matter halos
• Probabilistic Inference of the Structure and Orbit of Milky Way Satellites with Semi-Analytic Modeling
• An Accurate Comprehensive Approach to Substructure: IV. Dynamical Friction