Shape Profiles and Orientation Bias for Weak and Strong Lensing Cluster Halos

Abstract

We study the intrinsic shape and alignment of isodensities of galaxy cluster halos extracted from the MultiDark MDR1 cosmological simulation. We find that the simulated halos, are extremely prolate on small scales, and increasingly spherical on larger ones. Due to this trend, analytical projection along the line of sight produces an overestimate of the concentration index as a decreasing function of radius, which we quantify by using both the intrinsic distribution of 3D concentrations ($c_{200}$) and isodensity shape on weak and strong lensing scales. We find this difference to be $\sim 18\%$ ($\sim 9\%$) for low (medium) mass cluster halos with intrinsically low concentrations ($c_{200}=1-3$), while we find virtually no difference for halos with intrinsically high concentrations. Isodensities are found to be fairly well-aligned throughout the entirety of the radial scale of each halo population. However, major axes of individual halos have been found to deviate by as much as $\sim 30^{\circ }$. We also present a value-added catalog of our analysis results, which we have made publicly available to download.

arXiv comment9 pages, 6 figures, 3 tables

References in corpus (56)

• The Structure of Cold Dark Matter Halos
• Profiles of dark haloes: evolution, scatter, and environment
• Cosmological Parameters from Observations of Galaxy Clusters
• The Inner Structure of LambdaCDM Halos III: Universality and Asymptotic Slopes
• Triaxial Modeling of Halo Density Profiles with High-resolution N-body Simulations
• Adaptive Refinement Tree - a new high-resolution N-body code for cosmological simulations
• Halo concentrations in the standard LCDM cosmology
• The Structure of Dark Matter Haloes in Hierarchical Clustering Models
• The Shape of Dark Matter Halos: Dependence on Mass, Redshift, Radius, and Formation
• The spin and shape of dark matter haloes in the Millennium simulation of a LambdaCDM universe
• Haloes gone MAD: The Halo-Finder Comparison Project
• Internal and External Alignment of the Shapes and Angular Momenta of LCDM Halos
• The Effect of Gas Cooling on the Shapes of Dark Matter Halos
• On the Accuracy of Weak Lensing Cluster Mass Reconstructions
• Combining Strong and Weak Gravitational Lensing in Abell 1689
• Introduction to astroML: Machine Learning for Astrophysics
• The Surprisingly Steep Mass Profile of Abell 1689, from a Lensing Analysis of Subaru Images
• Combined strong and weak lensing analysis of 28 clusters from the Sloan Giant Arcs Survey
• Statistics of Physical Properties of Dark Matter Clusters
• The cluster gas mass fraction as a cosmological probe: a revised study
• The Phoenix Project: the Dark Side of Rich Galaxy Clusters
• Shapes and Alignments of Galaxy Cluster Halos
• The Redshift Evolution of LCDM Halo Parameters: Concentration, Spin, and Shape
• Characterizing the Cluster Lens Population
• The MultiDark Database: Release of the Bolshoi and MultiDark Cosmological Simulations
• Can the Steep Mass Profile of A1689 Be Explained by a Triaxial Dark Halo?
• The Shape of the Gravitational Potential in Cold Dark Matter Halos
• The Observed Concentration-Mass Relation for Galaxy Clusters
• Direct measurement of dark matter halo ellipticity from two-dimensional lensing shear maps of 25 massive clusters
• Comparison of Cluster Lensing Profiles with Lambda CDM Predictions
• Cluster Alignments and Ellipticities in LCDM Cosmology
• Parametric Strong Gravitational Lensing Analysis of Abell 1689
• What is the largest Einstein radius in the universe?
• Subaru Weak Lensing Measurements of Four Strong Lensing Clusters: Are Lensing Clusters Over-Concentrated?
• The Dynamical State and Mass-Concentration Relation of Galaxy Clusters
• Formation times, mass growth histories and concentrations of dark matter haloes
• Some like it triaxial: the universality of dark matter halo shapes and their evolution along the cosmic time
• Mock weak lensing analysis of simulated galaxy clusters: bias and scatter in mass and concentration
• A Detection of Dark Matter Halo Ellipticity using Galaxy Cluster Lensing in SDSS
• The impact of gas physics on strong cluster lensing
• Arc sensitivity to cluster ellipticity, asymmetries and substructures
• Shapes of clusters and groups of galaxies: Comparison of model predictions with observations
• The impact of AGN feedback and baryonic cooling on galaxy clusters as gravitational lenses
• Ellipsoidal halo finders and implications for models of triaxial halo formation
• Mass and Concentration estimates from Weak and Strong Gravitational Lensing: a Systematic Study
• Cosmology in 2D: the concentration-mass relation for galaxy clusters
• Cluster strong lensing in the Millennium Simulation: The effect of galaxies and structures along the line-of-sight
• Figure Rotation of Cosmological Dark Matter Halos
• The strongest gravitational lenses: I. The statistical impact of cluster mergers
• The Impact of Baryonic Cooling on Giant Arc Abundances
• Cosmology with the cluster mass function: mass estimators and shape systematics in large weak lensing surveys
• On the over-concentration problem of strong lensing clusters
• The effect of baryon cooling on the statistics of giant arcs and multiple quasars
• Constraining Cluster Physics with the Shape of X-ray Clusters: Comparison of Local X-ray Clusters versus LCDM Clusters
• How Baryonic Processes affect Strong Lensing properties of Simulated Galaxy Clusters
• A multi-wavelength strong lensing analysis of baryons and dark matter in the dynamically active cluster AC 114

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• On the shape of dark matter halos from MultiDark Planck simulations
• A look to the inside of haloes: a characterisation of the halo shape as a function of overdensity in the Planck cosmology
• The Galaxy Cluster Concentration-Mass Scaling Relation
• Evidence for a pressure discontinuity at the position of the Coma relic from Planck Sunyaev-Zel'dovich effect data
• X-ray to gamma-ray virial shock signal from the Coma cluster
• Out of sight, out of mind? The impact of correlated clustering in substructure lensing
• The importance of secondary halos for strong lensing in massive galaxy clusters across redshift
• Voronoi Tessellation and Non-parametric Halo Concentration