Galaxy Distribution as a Probe of the Ringlike Dark Matter Structure in the Galaxy Cluster Cl0024+17

Abstract

In a galaxy cluster, galaxies are mostly collisionless particles in recent epoches. They resemble collisionless cold dark matter particles in some way. Therefore, the spatial distributions of dark matter and cluster galaxies might be expected to possess similar features in the gravitational potential of a cluster. Here we use the galaxy distribution in cluster Cl0024+17 to probe for the ringlike dark matter structure recently discovered by means of strong and weak lensing observations. The galaxies are taken from the catalog of Czoske et al., which contains 650 objects with measured redshifts, of which ~300 galaxies have redshifts in the range 0.37<z<0.41 (and are therefore probable cluster members). We find that, at about the 3-sigma level, the ringlike structure seen in the dark matter measurement is not observed in the projected two-dimensional galaxy distribution.

arXiv comment3 pages 2 figures, minor corrections & new references, ApJ Letters, 2008, 679, L81

References in corpus (9)

• A Universal Density Profile from Hierarchical Clustering
• A direct empirical proof of the existence of dark matter
• Weak lensing mass reconstruction of the interacting cluster 1E0657-558: Direct evidence for the existence of dark matter
• A Textbook Example of a Bow Shock in the Merging Galaxy Cluster 1E0657-56
• Discovery of a Ringlike Dark Matter Structure in the Core of the Galaxy Cluster Cl 0024+17
• Weak Lensing Analysis of the z~0.8 cluster CL 0152-1357 with the Advanced Camera for Surveys
• HST/Acs Weak-Lensing and Chandra X-Ray Studies of the High-Redshift Cluster MS 1054-0321
• A wide-field spectroscopic survey of the cluster of galaxies Cl0024+1654: I. The catalogue
• A generalisation of the mass-sheet degeneracy producing ring-like artefacts in the lens mass distribution

Cited by in corpus (8)

• Tracing the Peculiar Dark Matter Structure in the Galaxy Cluster CL 0024+17 with Intracluster Stars and Gas
• Systematics in lensing reconstruction: Dark matter rings in the sky?
• Bullet Clusters in the MareNostrum Universe
• Mirror dark matter discovered?
• Offset between dark matter and ordinary matter: evidence from a sample of 38 lensing clusters of galaxies
• Structure of Abell 1995 from optical and X-ray data: a galaxy cluster with an elongated radio halo
• Second-order solutions of the equilibrium statistical mechanics for self-gravitating systems
• Probing clustering features around Cl 0024+17