On the Mass Profile of Galaxy Cluster CL 0024+1654 Inferred from Strong Lensing

Abstract

Observations of a flat density profile in the cores of dark-matter-dominated halos on the two extremes of mass for virialized objects in the universe, dwarf galaxies and galaxy clusters, present a serious challenge to the current standard theory of structure formation involving Cold Dark Matter (CDM). By contrast, N-body simulations of halo formation in the latter indicate density profiles which are singular and steeply rising towards the center. A flat-density core on the cluster scale is indicated by gravitational lensing observations, most significantly by the strong-lensing measurements of CL 0024+1654 by the Hubble Space Telescope. A recent re-analysis of this cluster has suggested that a uniform-density core is not demanded by the data, thereby eliminating a significant piece of the conflict between the observations and the CDM theoretical predictions. We show here, however, that the singular mass profile which that analysis reports as consistent with the lensing measurements of CL 0024+1654 implies a velocity dispersion which is much higher than the measured value for this cluster.

Submitted to The Astrophysical Journal (Part II), 15 pages, 1 figure. Revised in response to the referee report

References in corpus (5)

• Fluid Dark Matter
• Repulsive Dark Matter
• Constraints on the Structure of Dark Matter Halos from the Rotation Curves of Low Surface Brightness Galaxies
• Annihilating Cold Dark Matter
• Self-interacting Warm Dark Matter

Cited by in corpus (24)

• A High Resolution Study of the Hydra A Cluster with Chandra: Comparison of the Core Mass Distribution with Theoretical Predictions and Evidence for Feedback in the Cooling Flow
• Models of Galaxy Clusters with Thermal Conduction
• Discovery of a Ringlike Dark Matter Structure in the Core of the Galaxy Cluster Cl 0024+17
• Gravitational Lens Statistics for Generalized NFW Profiles: Parameter Degeneracy and Implications for Self-Interacting Cold Dark Matter
• The ESO Nearby Abell Cluster Survey. XII. The mass and mass-to-light-ratio profiles of rich clusters
• Chandra Observations of the Lensing Cluster EMSS 1358+6245: Implications for Self-Interacting Dark Matter
• A wide-field spectroscopic survey of the cluster of galaxies Cl0024+1654. II. A high-speed collision?
• The Postcollapse Equilibrium Structure of Cosmological Haloes in a Low-Density Universe
• The Mass Structure of the Galaxy Cluster Cl0024+1654 from a Full Lensing Analysis of Joint Subaru and ACS/NIC3 Observations
• Chandra Analysis and Mass Estimation of the Lensing Cluster of Galaxies CL0024+17
• Probing the Core Structure of Dark Halos with Tangential and Radial Arc Statistics
• The Density Profile of Cluster-scale Dark Matter Halos
• XMM-Newton study of the lensing cluster of galaxies CL0024+17
• Testing a new analytic model for gravitational lensing probabilities
• Non-parametric strong lens inversion of Cl~0024+1654: illustrating the monopole degeneracy
• AGN heating, thermal conduction and Sunyaev-Zeldovich effect in galaxy groups and clusters
• Determining Tangential Peculiar Velocities of Clusters of Galaxies using Gravitational Lensing
• Extracting the Dark Matter Profile of a Relaxed Galaxy Cluster
• The Central Mass and Phase-Space Densities of Dark Matter Halos: Cosmological Implications
• Morphology of low-redshift compact galaxy clusters I. Shapes and radial profiles
• Observing high redshift galaxy clusters through lensing of the Ostriker-Vishniac effect
• Compact Groups in GDM Cosmological Simulations
• On the thermal footsteps of Neutralino relic gases
• Applications of Bayesian Probability Theory in Astrophysics