Unbound Particles in Dark Matter Halos

Abstract

We investigate unbound dark matter particles in halos by tracing particle trajectories in a simulation run to the far future (a = 100). We find that the traditional sum of kinetic and potential energies is a very poor predictor of which dark matter particles will eventually become unbound from halos. We also study the mass fraction of unbound particles, which increases strongly towards the edges of halos, and decreases significantly at higher redshifts. We discuss implications for dark matter detection experiments, precision calibrations of the halo mass function, the use of baryon fractions to constrain dark energy, and searches for intergalactic supernovae.

Significant improvements following referee suggestions

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Cited by in corpus (24)

• UniverseMachine: The Correlation between Galaxy Growth and Dark Matter Halo Assembly from z=0-10
• Mergers and Mass Accretion for Infalling Halos Both End Well Outside Cluster Virial Radii
• The Three Causes of Low-Mass Assembly Bias
• Testing the theory of gravity with DESI: estimators, predictions and simulation requirements
• Major Mergers Going Notts: Challenges for Modern Halo Finders
• On The History and Future of Cosmic Planet Formation
• Interpreting Short Gamma Ray Burst Progenitor Kicks and Time Delays Using the Host Galaxy-Dark Matter Halo Connection
• Hierarchical Galaxy Growth and Scatter in the Stellar Mass - Halo Mass Relation
• Angular Momentum of Dwarf Galaxies
• Probing Light Dark Matter through Cosmic-Ray Cooling in Active Galactic Nuclei
• The Three Hundred project: Galaxy groups do not survive cluster infall
• Living with Neighbors. II. Statistical Analysis of Flybys and Mergers of Dark Matter Halos in Cosmological Simulations
• Tidal Stripping and Post-Merger Relaxation of Dark Matter Halos: Causes and Consequences of Mass Loss
• Probing Theories of Gravity with Phase Space-Inferred Potentials of Galaxy Clusters
• Inferring Gravitational Potentials from Mass Densities in Cluster-sized Halos
• Cosmology with Galaxy Cluster Phase Spaces
• Orbits of particles with magnetic dipole moment around magnetized Schwarzschild black holes: Applications to S2 star orbit
• Particle ejection during mergers of dark matter halos
• On Escaping a Galaxy Cluster in an Accelerating Universe
• Void replenishment: how voids accrete matter over cosmic history
• Quantifying the Projected Suppression of Cluster Escape Velocity Profiles
• A Gravitational Double Scattering Mechanism for Generating High Velocity Objects
• Distinguishing Orbiting and Infalling Dark Matter Particles with Machine Learning
• A dynamics-based density profile for dark haloes. I. Algorithm and basic results