Intracluster light is a biased tracer of the dark matter distribution in clusters

Abstract

The diffuse stellar component of galaxy clusters known as intracluster light (ICL) has been proposed as an observable tracer of the cluster's dark matter (DM) halo. Assessing its reliability as a DM tracer requires understanding how the intracluster stars are energetically linked to the underlying DM distribution, which we investigate at $z\approx 0$ in 12 galaxy clusters with $M_{178}=1.18-3.71\times 10^{14}{\text{M}}_{\odot }$ from the Horizon-AGN simulation. We quantify the orbital energies of these components by their mean specific energies $⟨\epsilon ⟩$, and find that this quantity is $\approx$ 25 per cent lower for the intracluster stars than the DM, whilst the energetics of the satellite galaxies (a standard DM tracer) are only marginally ($\approx$ 5 per cent) higher than the DM. Importantly, the lower $⟨\epsilon ⟩$ of the intracluster stars compared to the DM is robust against the precise separation between the brightest cluster galaxy (BCG) and the ICL. The specific energy distribution of ICL stars is concentrated towards lower energies and poorly samples the higher energies, where much of the DM resides. Consequently, the intracluster stars have velocity distributions with lower typical speeds and a more centrally-concentrated density profile than the DM. We also find that intracluster stars have more radially-biased orbits than the DM, indicating these components have distinct orbital distributions. This study demonstrates that although the morphology of the ICL may match the DM halo, the ICL is a biased tracer of DM, and these biases must be understood in order to infer properties of the DM from the ICL.

arXiv comment13 pages, 8 figures, accepted for publication to MNRAS

References in corpus (93)

• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Planck 2013 results. XVI. Cosmological parameters
• LSST: from Science Drivers to Reference Design and Anticipated Data Products
• Observational evidence for self-interacting cold dark matter
• Cosmological Hydrodynamics with Adaptive Mesh Refinement: a new high resolution code called RAMSES
• First results from the IllustrisTNG simulations: the stellar mass content of groups and clusters of galaxies
• Radiative Transfer in a Clumpy Universe: II. The Utraviolet Extragalactic Background
• Dark Matter Candidates from Particle Physics and Methods of Detection
• Dark Matter Self-interactions and Small Scale Structure
• The Hyper Suprime-Cam SSP Survey: Overview and Survey Design
• Direct constraints on the dark matter self-interaction cross-section from the merging galaxy cluster 1E0657-56
• Dancing in the dark: galactic properties trace spin swings along the cosmic web
• The Core-Cusp Problem
• Weak lensing mass reconstruction of the interacting cluster 1E0657-558: Direct evidence for the existence of dark matter
• The properties of warm dark matter haloes
• The haloes of bright satellite galaxies in a warm dark matter universe
• A Census of Baryons in Galaxy Clusters and Groups
• Third Data Release of the Hyper Suprime-Cam Subaru Strategic Program
• Velocity and spatial biases in CDM subhalo distributions
• The origin and implications of dark matter anisotropic cosmic infall on ~L* haloes
• GALICS I: A hybrid N-body semi-analytic model of hierarchical galaxy formation
• Core Formation in Dwarf Halos with Self Interacting Dark Matter: No Fine-Tuning Necessary
• Galaxy Cluster Baryon Fractions Revisited
• Cluster Lenses
• The Importance of Mergers for the Origin of Intracluster Stars in Cosmological Simulations of Galaxy Clusters
• Building Merger Trees from Cosmological N-body Simulations
• The Horizon-AGN simulation: evolution of galaxy properties over cosmic time
• The Hydrangea simulations: galaxy formation in and around massive clusters
• The Hierarchical Build-Up of Massive Galaxies and the Intracluster Light since z=1
• The Rise and Fall of Satellites in Galaxy Clusters
• Structure Finding in Cosmological Simulations: The State of Affairs
• The globular cluster system of NGC 1399 V. dynamics of the cluster system out to 80 kpc
• CLASH-VLT: The mass, velocity-anisotropy, and pseudo-phase-space density profiles of the z=0.44 galaxy cluster MACS 1206.2-0847
• On the formation and physical properties of the Intra-Cluster Light in hierarchical galaxy formation models
• Masses of galaxy clusters from gravitational lensing
• Initial Conditions for Large Cosmological Simulations
• Wide-Field Precision Kinematics of the M87 Globular Cluster System
• Mass profiles of Galaxy Clusters from X-ray analysis
• Substructure in Dark Halos: Orbital Eccentricities and Dynamical Friction
• Halo Mass and Assembly History Exposed in the Faint Outskirts: the Stellar and Dark Matter Haloes of Illustris Galaxies
• The Formation and Evolution of Intracluster Light
• The Origin and Properties of Intracluster Stars in a Rich Cluster
• Intracluster light: a luminous tracer for dark matter in clusters of galaxies
• Determination of the Dark Matter Profile of Abell 2199 from Integrated Starlight
• Sussing Merger Trees: The Merger Trees Comparison Project
• LoCuSS: Testing hydrostatic equilibrium in galaxy clusters
• Tidal Streams of Intracluster Light
• Characterizing Diffused Stellar Light in simulated galaxy clusters
• The Preferential Tidal Stripping of Dark Matter versus Stars in Galaxies
• Dark Energy Survey Year 1 results: Detection of Intra-cluster Light at Redshift $\sim$ 0.25
• The stellar dynamics and mass of NGC 1316 using the radial velocities of planetary nebulae
• The Accuracy of Subhalo Detection
• The Cluster Velocity Dispersion of the Abell 2199 cD Halo of NGC 6166
• A Systematic Analysis of Caustic Methods for Galaxy Cluster Masses
• The planetary nebula population in the halo of M87
• Dynamical difference between the cD galaxy and the stellar diffuse component in simulated galaxy clusters
• The intra-cluster light as a tracer of the total matter density distribution: a view from simulations
• The buildup of the intracluster light of Abell 85 as seen by Subaru's Hyper Suprime-Cam
• The extended Planetary Nebula Spectrograph (ePN.S) early-type galaxy survey. The kinematic diversity of stellar halos and the relation between halo transition scale and stellar mass
• Profiles of Dark Matter Velocity Anisotropy in Simulated Clusters
• The SLUGGS Survey: Dark matter fractions at large radii and assembly epochs of early-type galaxies from globular cluster kinematics
• The dynamical structure of dark matter haloes
• Introducing a new, robust galaxy finder algorithm for simulations
• The SLUGGS Survey: The mass distribution in early-type galaxies within five effective radii and beyond
• Photometric dissection of Intracluster Light and its correlations with host cluster properties
• Radial velocity moments of dark matter haloes
• Structural and dynamical modeling of WINGS clusters. II. The orbital anisotropies of elliptical, spiral and lenticular galaxies
• Simulating the evolution of disc galaxies in a group environment. I. The influence of the global tidal field
• Theoretical Predictions of Colors and Metallicity of the Intra-Cluster Light
• The correlation between the sizes of globular cluster systems and their host dark matter haloes
• The Fornax Cluster VLT Spectroscopic Survey. I - VIMOS spectroscopy of compact stellar systems in the Fornax core region
• From Stellar Halos to Intracluster Light: the physics of the Intra-Halo Stellar Component in cosmological hydrodynamical simulations
• Clocking the formation of today's largest galaxies: Wide field integral spectroscopy of Brightest Cluster Galaxies and their surroundings
• Disentangling the ICL with the CHEFs: Abell 2744 as a case study
• Integral-field kinematics and stellar populations of early-type galaxies out to three half-light radii
• Sloshing in its cD halo: MUSE kinematics of the central galaxy NGC 3311
• Globular clusters as tracers of the dark matter halo: insights from the E-MOSAICS simulations
• On the correlation between dark matter, intracluster light and globular cluster distribution in SMACS0723
• Simulating the Spatial Distribution and Kinematics of Globular Clusters within Galaxy Clusters in Illustris
• The halo of M49 and its environment as traced by planetary nebulae
• Characterising the intra-cluster light in The Three Hundred simulations
• The Three Hundred Project: Substructure in hydrodynamical and dark matter simulations of galaxy groups around clusters
• Galaxy and Mass Assembly (GAMA): Extended Intra-Group Light in a group at $z=0.2$ from deep Hyper-Suprime Cam images
• Characterising the Intracluster Light over the Redshift Range $0.2<z<0.8$ in the DES-ACT Overlap
• The Sphere of Influence of the Bright Central Galaxies in the Diffuse Light of SDSS Clusters
• Slow evolution of elliptical galaxies induced by dynamical friction III. Role of density concentration and pressure anisotropy
• JWST's PEARLS: 119 multiply imaged galaxies behind MACS0416, lensing properties of caustic crossing galaxies, and the relation between halo mass and number of globular clusters at $z=0.4$
• The formation of the brightest cluster galaxy and intracluster light in cosmological N-body simulations with the Galaxy Replacement Technique
• Merger histories of brightest group galaxies from MUSE stellar kinematics
• Assembly of the Intracluster Light in the Horizon-AGN Simulation
• The trajectories of galaxies in groups: mass loss and preprocessing
• Star formation beyond galaxies: widespread in-situ formation of intra-cluster stars
• How does the velocity anisotropy of halo stars, dark matter and satellite galaxies depend on host halo properties?

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