The splashback radius of halos from particle dynamics. I. The SPARTA algorithm

Abstract

Motivated by the recent proposal of the splashback radius as a physical boundary of dark matter halos, we present a parallel computer code for Subhalo and PARticle Trajectory Analysis (SPARTA). The code analyzes the orbits of all simulation particles in all host halos, billions of orbits in the case of typical cosmological N-body simulations. Within this general framework, we develop an algorithm that accurately extracts the location of the first apocenter of particles after infall into a halo, or splashback. We define the splashback radius of a halo as the smoothed average of the apocenter radii of individual particles. This definition allows us to reliably measure the splashback radii of 95% of host halos above a resolution limit of 1000 particles. We show that, on average, the splashback radius and mass are converged to better than 5% accuracy with respect to mass resolution, snapshot spacing, and all free parameters of the method.

19 pages, 13 figures. Minor changes to match the version published in ApJS

References in corpus (18)

• Introducing the Illustris Project: Simulating the coevolution of dark and visible matter in the Universe
• Transients from Initial Conditions in Cosmological Simulations
• Rotation-Dependent Catastrophic Disruption of Gravitational Aggregates
• A universal model for halo concentrations
• Splashback in accreting dark matter halos
• The Unorthodox Orbits of Substructure Halos
• Cosmic Ménage à Trois: The Origin of Satellite Galaxies On Extreme Orbits
• The shapes, orientation, and alignment of Galactic dark matter subhalos
• The splashback radius of halos from particle dynamics. II. Dependence on mass, accretion rate, redshift, and cosmology
• Galaxy Groups
• Mass Accretion and its Effects on the Self-Similarity of Gas Profiles in the Outskirts of Galaxy Clusters
• The Halo Boundary of Galaxy Clusters in the SDSS
• Splashback Shells of Cold Dark Matter Halos
• Lensing Constraints on the Mass Profile Shape and the Splashback Radius of Galaxy Clusters
• Assembly Bias and Splashback in Galaxy Clusters
• Orbital parameters of infalling satellite haloes in the hierarchical $\Lambda$CDM model
• On Universal Halos and the Radial Orbit Instability
• Baryonic impact on the dark matter orbital properties of Milky Way-sized haloes

Cited by in corpus (73)

• COLOSSUS: A python toolkit for cosmology, large-scale structure, and dark matter halos
• Cluster-galaxy weak lensing
• The splashback radius of halos from particle dynamics. II. Dependence on mass, accretion rate, redshift, and cosmology
• Limitations to the "basic'' HOD model and beyond
• The Three Hundred Project: Backsplash galaxies in simulations of clusters
• Signatures of Self-Interacting dark matter on cluster density profile and subhalo distributions
• Measurement of the Splashback Feature around SZ-selected Galaxy Clusters with DES, SPT and ACT
• The Three Causes of Low-Mass Assembly Bias
• Universal at last? The splashback mass function of dark matter halos
• The Splashback Radius of Planck-SZ clusters
• The splashback boundary of haloes in hydrodynamic simulations
• Weak Lensing Reveals a Tight Connection Between Dark Matter Halo Mass and the Distribution of Stellar Mass in Massive Galaxies
• How Biased Are Halo Properties in Cosmological Simulations?
• A natural boundary of dark matter haloes revealed around the minimum bias and maximum infall locations
• Exploring the squeezed three-point galaxy correlation function with generalized halo occupation distribution models
• Constraining resonant dark matter self-interactions with strong gravitational lenses
• Baryonic Imprints on DM Halos: Population Statistics from Dwarf Galaxies to Galaxy Clusters
• Probing galaxy evolution in massive clusters using ACT and DES: splashback as a cosmic clock
• Cosmological baryon transfer in the SIMBA simulations
• Flybys, orbits, splashback: subhalos and the importance of the halo boundary
• How Accurately Can We Detect the Splashback Radius of Dark Matter Halos and its Correlation With Accretion Rate?
• The MillenniumTNG Project: An improved two-halo model for the galaxy-halo connection of red and blue galaxies
• The splashback radius of optically selected clusters with Subaru HSC Second Public Data Release
• Pre-processing, group accretion and the orbital trajectories of associated subhaloes
• Physical Correlations of the Scatter between Galaxy Mass, Stellar Content, and Halo Mass
• Shocks in the Stacked Sunyaev-Zel'dovich Profiles of Clusters I: Analysis with the Three Hundred Simulations
• A Redefinition of the Halo Boundary Leads to a Simple yet Accurate Halo Model of Large Scale Structure
• The splashback radius of halos from particle dynamics: III. Halo catalogs, merger trees, and host-subhalo relations
• The Phase Space Structure of Dark Matter Halos
• How gas flows shape the stellar-halo mass relation in the EAGLE simulation
• A dynamics-based density profile for dark haloes -- II. Fitting function
• Halo Exclusion Criteria Impacts Halo Statistics
• Diffstar: A Fully Parametric Physical Model for Galaxy Assembly History
• First measurement of the characteristic depletion radius of dark matter haloes from weak lensing
• Splashback radius of nonspherical dark matter halos from cosmic density and velocity fields
• Intrinsic Alignments and Splashback Radius of Dark Matter Halos from Cosmic Density and Velocity Fields
• What sets the splashback radius of dark matter haloes: accretion history or other properties?
• ZOMG III: The effect of Halo Assembly on the Satellite Population
• Phase-space structure of cold dark matter halos inside splashback: multi-stream flows and self-similar solution
• Turnaround radius of galaxy clusters in N-body simulations
• Euclid: Effect of sample covariance on the number counts of galaxy clusters
• Physical evolution of dark matter halo around the depletion boundary
• Scatter in Sunyaev--Zel'dovich effect scaling relations explained by inter-cluster variance in mass accretion histories
• KLLR: A scale-dependent, multivariate model class for regression analysis
• Virial halo mass function in the $Planck$ cosmology
• A Better Way to Define Dark Matter Haloes
• AMICO galaxy clusters in KiDS-DR3: measuring the splashback radius from weak gravitational lensing
• The Ultraviolet Detection of Diffuse Gas in Galaxy Groups
• Explaining dark matter halo density profiles with neural networks
• The Evolution and Mass Dependence of Galaxy Cluster Pressure Profiles at 0.05 $\le z\le$ 0.60 and $4\times 10^{14}$ M${}_{\odot }$ $\le {\text{M}}_{500}\le 30\times 10^{14}$ M${}_{\odot }$
• The outermost edges of the Milky Way halo from galaxy kinematics
• Halo mass and weak galaxy-galaxy lensing profiles in rescaled cosmological $N$-body simulations
• Galaxy cluster mass accretion rates from IllustrisTNG
• The mass-size relation of galaxy clusters
• Beyond Mass: Detecting Secondary Halo Properties with Galaxy-Galaxy Lensing
• Measuring the mass and concentration of dark matter halos from the velocity dispersion profile of their stars
• Haloes at the ragged edge: The importance of the splashback radius
• Dynamical cluster masses from photometric surveys
• ScamPy -- A sub-halo clustering & abundance matching based Python interface for painting galaxies on the dark matter halo/sub-halo hierarchy
• The Diffusion Coefficient of the Splashback Mass Function as a Probe of Cosmology
• Universal multi-stream radial structures of cold dark matter halos
• The Milky Way satellite galaxy Leo T: A perturbed cored dwarf
• Memoirs of mass accretion: probing the edges of intracluster light in simulated galaxy clusters
• The Three Hundred Project: deducing the stellar splashback structure of galaxy clusters from their orbiting profiles
• BASILISK II. Improved Constraints on the Galaxy-Halo Connection from Satellite Kinematics in SDSS
• The Splashback Mass Function in the Presence of Massive Neutrinos
• The Pseudo Evolution of Galaxy-Cluster Masses and Its Connection to Mass Density Profile
• Distinguishing Orbiting and Infalling Dark Matter Particles with Machine Learning
• The Boosted Potential
• STRAWBERRY: Finding haloes in the gravitational potential
• A dynamics-based density profile for dark haloes. I. Algorithm and basic results
• Connecting galaxy evolution in clusters with their radial profiles and phase space distribution: results from the IllustrisTNG hydrodynamical simulations
• AMICO galaxy clusters in KiDS-1000: Splashback radius from weak lensing and cluster-galaxy correlation function