Concentrations of Dark Haloes Emerge from Their Merger Histories

Abstract

The concentration parameter is a key characteristic of a dark matter halo that conveniently connects the halo's present-day structure with its assembly history. Using 'Dark Sky', a suite of cosmological $N$-body simulations, we investigate how halo concentration evolves with time and emerges from the mass assembly history. We also explore the origin of the scatter in the relation between concentration and assembly history. We show that the evolution of halo concentration has two primary modes: (1) smooth increase due to pseudo-evolution; and (2) intense responses to physical merger events. Merger events induce lasting and substantial changes in halo structures, and we observe a universal response in the concentration parameter. We argue that merger events are a major contributor to the uncertainty in halo concentration at fixed halo mass and formation time. In fact, even haloes that are typically classified as having quiescent formation histories experience multiple minor mergers. These minor mergers drive small deviations from pseudo-evolution, which cause fluctuations in the concentration parameters and result in effectively irreducible scatter in the relation between concentration and assembly history. Hence, caution should be taken when using present-day halo concentration parameter as a proxy for the halo assembly history, especially if the recent merger history is unknown.

arXiv comment15 pages, 7 + 1 figures, accepted for publication in MNRAS, comments welcome

References in corpus (73)

• Scikit-learn: Machine Learning in Python
• Astropy: A Community Python Package for Astronomy
• The NumPy array: a structure for efficient numerical computation
• A Universal Density Profile from Hierarchical Clustering
• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• The Structure of Cold Dark Matter Halos
• Planck 2013 results. XVI. Cosmological parameters
• Simulating the joint evolution of quasars, galaxies and their large-scale distribution
• Profiles of dark haloes: evolution, scatter, and environment
• Statistical Properties of X-ray Clusters: Analytic and Numerical Comparisons
• Halo Models of Large Scale Structure
• Planck 2018 results. I. Overview and the cosmological legacy of Planck
• The Rockstar Phase-Space Temporal Halo Finder and the Velocity Offsets of Cluster Cores
• Concentrations of Dark Halos from their Assembly Histories
• Analytic model for galaxy and dark matter clustering
• MultiDark simulations: the story of dark matter halo concentrations and density profiles
• Halos and galaxies in the standard cosmological model: results from the Bolshoi simulation
• Dark matter halo concentrations in the Wilkinson Microwave Anisotropy Probe year 5 cosmology
• The Halo Occupation Distribution: Towards an Empirical Determination of the Relation Between Galaxies and Mass
• Resolving the Structure of Cold Dark Matter Halos
• The Diversity and Similarity of Simulated Cold Dark Matter Halos
• The Connection between Galaxies and their Dark Matter Halos
• The statistics of LCDM Halo Concentrations
• Concentration, Spin and Shape of Dark Matter Haloes as a Function of the Cosmological Model: WMAP1, WMAP3 and WMAP5 results
• The age dependence of halo clustering
• Halo concentrations in the standard LCDM cosmology
• Gravitationally Consistent Halo Catalogs and Merger Trees for Precision Cosmology
• The Dependence of Halo Clustering on Halo Formation History, Concentration, and Occupation
• The redshift dependence of the structure of massive LCDM halos
• COLOSSUS: A python toolkit for cosmology, large-scale structure, and dark matter halos
• Accurate universal models for the mass accretion histories and concentrations of dark matter halos
• Rotation-Dependent Catastrophic Disruption of Gravitational Aggregates
• Dependence of the outer density profiles of halos on their mass accretion rate
• Dark Energy Survey Year 1 Results: Constraints on Extended Cosmological Models from Galaxy Clustering and Weak Lensing
• The Growth and Structure of Dark Matter Haloes
• A universal model for halo concentrations
• The Mass-Concentration-Redshift Relation of Cold and Warm Dark Matter Halos
• The Assembly of Galaxies in a Hierarchically Clustering Universe
• The Universal Mass Accretion History of CDM Haloes
• The Mass-Concentration-Redshift Relation of Cold Dark Matter Halos
• The accretion history of dark matter halos III: A physical model for the concentration-mass relation
• Halo and Subhalo Demographics with Planck Cosmological Parameters: Bolshoi-Planck and MultiDark-Planck Simulations
• Dark Matter Halo Profiles of Massive Clusters: Theory vs. Observations
• Halo mass - concentration relation from weak lensing
• CLASH: The Concentration-Mass Relation of Galaxy Clusters
• Mass Accretion Rates and Histories of Dark Matter Haloes
• The Mass Profile and Accretion History of Cold Dark Matter Halos
• The pseudo-evolution of halo mass
• On Halo Formation Times and Assembly Bias
• Assembly History and Structure of Galactic Cold Dark Matter Halos
• The Observed Concentration-Mass Relation for Galaxy Clusters
• Density profiles of LCDM clusters
• The Aemulus Project I: Numerical Simulations for Precision Cosmology
• The accretion history of dark matter halos I: The physical origin of the universal function
• Beyond Assembly Bias: Exploring Secondary Halo Biases for Cluster-size Haloes
• Halo Profiles and the Concentration-Mass Relation for a ΛCDM Universe
• The accretion history of dark matter halos II: The connections with the mass power spectrum and the density profile
• The Dynamical State and Mass-Concentration Relation of Galaxy Clusters
• The Outer Rim Simulation: A Path to Many-Core Supercomputers
• On The Assembly History of Dark Matter Haloes
• Coming of Age in the Dark Sector: How Dark Matter Haloes grow their Gravitational Potential Wells
• Dark Sky Simulations: Early Data Release
• Merger vs. Accretion and the Structure of Dark Matter Halos
• Dissecting the Evolution of Dark Matter Subhaloes in the Bolshoi Simulation
• Rhapsody. I. Structural Properties and Formation History From a Statistical Sample of Re-simulated Cluster-size Halos
• Genetically modified halos: towards controlled experiments in $\Lambda$CDM galaxy formation
• Properties of Dark Matter Halos as a Function of Local Environment Density
• 2HOT: An Improved Parallel Hashed Oct-Tree N-Body Algorithm for Cosmological Simulation
• A constant characteristic volume density of dark matter haloes from SPARC rotation curve fits
• Sensitivity of dark matter haloes to their accretion histories
• Tidal Stripping and Post-Merger Relaxation of Dark Matter Halos: Causes and Consequences of Mass Loss
• Halo concentrations from extended Press-Schechter merger histories
• A Random Walk Model for Dark Matter Halo Concentrations

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• Symphony: Cosmological Zoom-in Simulation Suites over Four Decades of Host Halo Mass
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• TheHaloMod: An online calculator for the halo model
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• How cosmological merger histories shape the diversity of stellar haloes
• First measurement of the characteristic depletion radius of dark matter haloes from weak lensing
• Diffstar: A Fully Parametric Physical Model for Galaxy Assembly History
• What sets the splashback radius of dark matter haloes: accretion history or other properties?
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• Insights into the origin of halo mass profiles from machine learning
• Simulation view of galaxy clusters with low X-ray surface brightness
• Explaining dark matter halo density profiles with neural networks
• Reconsidering the dynamical states of galaxy clusters using PCA and UMAP
• On the choice of the most suitable indicator for the assembly state of dark matter haloes through cosmic time
• Culminating the peak CUSP to descry the dark side of halos
• Mock halo catalogs: assigning unresolved halo properties using correlations with local halo environment
• EDGE: the puzzling ellipticity of Eridanus II's star cluster and its implications for dark matter at the heart of an ultra-faint dwarf
• Connection between galaxy morphology and dark-matter halo structure I: a running threshold for thin discs and size predictors from the dark sector
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• A Random Walk Model for Dark Matter Halo Concentrations
• Accurate Analytic Mass-Scale Relations for Dark Matter Haloes of all Masses and Redshifts
• Effects of Neutrino Masses and Asymmetries on Dark Matter Halo Assembly
• Cluster Assembly Times as a Cosmological Test
• MultiCAM: A multivariable framework for connecting the mass accretion history of haloes with their properties
• Characterizing the assembly of dark matter halos with protohalo size histories: I. Redshift evolution, relation to descendant halos, and halo assembly bias
• Memoirs of mass accretion: probing the edges of intracluster light in simulated galaxy clusters
• The eventful life journey of galaxy clusters. I. Impact of DM halo and ICM properties on their full assembly histories
• Applying unsupervised learning to resolve evolutionary histories and explore the galaxy-halo connection in IllustrisTNG
• The Influence of Subhaloes on Host Halo Properties
• The impact of baryons on the sparsity of simulated galaxy clusters from The Three Hundred Project
• The multi-dimensional halo assembly bias can be preserved when enhancing halo properties with HALOSCOPE
• Observed versus Simulated Halo c-Mvir Relations
• Timing the last major merger of galaxy clusters with large halo sparsity
• Reconciling concentration to virial mass relations
• AVID: A Near-Major Post-Merger of Late-Type Dwarfs beneath a Regularly Rotating HI Disk (VCC 693)
• The eventful life journey of galaxy clusters. II. Impact of mass accretion on the thermodynamical structure of the ICM
• Cosmic Reionization On Computers: Baryonic Effects on Halo Concentrations During the Epoch of Reionization