STRAWBERRY: Finding haloes in the gravitational potential

Abstract

Here, we present a novel algorithm that discriminates between bound and unbound particles by consideration of the gravitational potential from an accelerated reference frame -- also referred to as `the boosted potential'. Particles are considered bound if their energy does not exceed the escape energy of a potential well -- given by the closest saddle-point that connects to a deeper potential minimum. This approach has core benefits over previous approaches, since it does not require any ad-hoc thresholds (such as over-density criteria), it includes the gravitational effect of all particles in the binding criterion (improving over widely used self-potential binding checks) and it only operates with instantaneous information (making it simpler than approaches based on dynamical histories). We show that particles typically become bound between their first peri- and apo-centeric passage and that bound and unbound populations show very distinct characteristics through their distribution in phase space, their density profiles, their virial ratios, and their redshift evolution. Our findings suggest that it is possible to understand haloes as two-component systems, with one component being bound, virialized, of finite extent and evolving slowly in quasi-equilibrium and the other component being unbound, unvirialized and evolving rapidly.

15 pages, 16 figures, Accepted in A&A, public code: https://github.com/trg-richardson/strawberry

References in corpus (68)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Array Programming with NumPy
• A Universal Density Profile from Hierarchical Clustering
• Populating a cluster of galaxies - I. Results at z=0
• Baryonic Features in the Matter Transfer Function
• First results from the IllustrisTNG simulations: matter and galaxy clustering
• Toward a halo mass function for precision cosmology: the limits of universality
• The Rockstar Phase-Space Temporal Halo Finder and the Velocity Offsets of Cluster Cores
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Cosmological Implications from two Decades of Spectroscopic Surveys at the Apache Point observatory
• Dark Energy Survey Year 1 Results: Cosmological Constraints from Galaxy Clustering and Weak Lensing
• Dark Energy Survey Year 3 Results: Cosmological Constraints from Galaxy Clustering and Weak Lensing
• Analytic model for galaxy and dark matter clustering
• Halo occupation numbers and galaxy bias
• Modeling Luminosity-Dependent Galaxy Clustering Through Cosmic Time
• KiDS-1000 Cosmology: Multi-probe weak gravitational lensing and spectroscopic galaxy clustering constraints
• The persistent cosmic web and its filamentary structure I: Theory and implementation
• Euclid. I. Overview of the Euclid mission
• The Nature of Galaxy Bias and Clustering
• HOP: A New Group-Finding Algorithm for N-body Simulations
• Spatial correlation function and pairwise velocity dispersion of galaxies: CDM models versus the Las Campanas Survey
• Rotation-Dependent Catastrophic Disruption of Gravitational Aggregates
• Dependence of the outer density profiles of halos on their mass accretion rate
• Haloes gone MAD: The Halo-Finder Comparison Project
• Simulating cosmic structure formation with the GADGET-4 code
• The origin and implications of dark matter anisotropic cosmic infall on ~L* haloes
• The impact of mergers on relaxed X-ray clusters - I. Dynamical evolution and emergent transient structures
• The Atacama Cosmology Telescope: A Catalog of > 4000 Sunyaev-Zel'dovich Galaxy Clusters
• The Non-Parametric Model for Linking Galaxy Luminosity with Halo/Subhalo Mass
• The universality of the virial halo mass function and models for non-universality of other halo definitions
• Universal structure of dark matter haloes over a mass range of 20 orders of magnitude
• The Three Hundred project: a large catalogue of theoretically modelled galaxy clusters for cosmological and astrophysical applications
• Statistics of Physical Properties of Dark Matter Clusters
• Splashback in accreting dark matter halos
• The Topology ToolKit
• The BACCO Simulation Project: Exploiting the full power of large-scale structure for cosmology
• The pseudo-evolution of halo mass
• DESI 2024 VII: Cosmological Constraints from the Full-Shape Modeling of Clustering Measurements
• Assembly History and Structure of Galactic Cold Dark Matter Halos
• The Shape of Dark Matter Haloes in the Aquarius Simulations: Evolution and Memory
• The Warm DM halo mass function below the cut-off scale
• An Analytical Model for the Triaxial Collapse of Cosmological Perturbations
• ORIGAMI: Delineating Halos using Phase-Space Folds
• Galaxy orientation with the cosmic web across cosmic time
• Intrinsic alignment of simulated galaxies in the cosmic web: implications for weak lensing surveys
• The splashback radius of halos from particle dynamics. I. The SPARTA algorithm
• Some like it triaxial: the universality of dark matter halo shapes and their evolution along the cosmic time
• A hydrodynamical halo model for weak-lensing cross correlations
• AMICO galaxy clusters in KiDS-DR3: weak-lensing mass calibration
• \textsc{The Three Hundred} project: The \textsc{Gizmo-Simba} run
• AMICO galaxy clusters in KiDS-DR3: cosmological constraints from counts and stacked weak-lensing
• On the impact of baryons on the halo mass function, bias, and cluster cosmology
• Weak lensing Analysis of X-Ray-selected XXL Galaxy Groups and Clusters with Subaru HSC Data
• CoMaLit III. Literature Catalogs of weak Lensing Clusters of galaxies (LC^2)
• The halo model for cosmology: a pedagogical review
• A flexible subhalo abundance matching model for galaxy clustering in redshift space
• Symphony: Cosmological Zoom-in Simulation Suites over Four Decades of Host Halo Mass
• Galaxy Clusters Discovered via the Thermal Sunyaev-Zel'dovich Effect in the 500-square-degree SPTpol Survey
• Structure and kinematics of tidally limited satellite galaxies in LCDM
• Non-universality of the mass function: dependence on the growth rate and power spectrum shape
• Mass loss in tidally stripped systems; the energy-based truncation method
• Tidal Stripping in the Adiabatic Limit
• Simulating the Complexity of the Dark Matter Sheet I: Numerical Algorithms
• A dynamics-based density profile for dark haloes -- II. Fitting function
• Testing dark matter halo properties using self-similarity
• A Better Way to Define Dark Matter Haloes
• SHAMe-SF: Predicting the clustering of star-forming galaxies with an enhanced abundance matching model
• Rhapsody-C simulations -- Anisotropic thermal conduction, black hole physics, and the robustness of massive galaxy cluster scaling relations
• Testing the thermal Sunyaev-Zel'dovich power spectrum of a halo model using hydrodynamical simulations