A wide field survey of the distant rich cluster CL0024+1654

Details A wide field survey of the distant rich cluster CL0024+1654 A wide field survey of the distant rich cluster CL0024+1654

2001-12-17

arxiv.org/abs/astro-ph/0112409v1

Astronomy and Astrophysics

Astrophysics

8 pages, to appear in "SESTO-2001-Tracing Cosmic Evolution with Galaxy Clusters", ASP conference series

Scientific paper

We describe the first results from a comprehensive study of the distant cluster Cl0024+1654 (z=0.39) based upon a pattern of 38 mosaiced HST-WFPC2 images extending to radii ~5Mpc. These are being analysed in conjunction with extensive spectroscopy conducted with the CFHT, WHT, and Keck Telescopes. The overall goal is to understand the morphological transformations and associated short-term star formation histories of representative numbers of infalling field galaxies in the context of the cluster potential as defined by weak lensing studies. Our HST database contains over 2000 galaxy morphologies to I=22.5. Spectroscopic data and HST morphologies are currently available for about 215 members over an unprecedented range of environments. We confirm the existence of a well-defined morphology-density relation over a large dynamic range within a single system at a significant look-back time. Tentative trends in the E/S0 fraction as a function of radius are discussed. A weak lensing signal in the background galaxies has been detected at the cluster periphery and its inversion demonstrates only marginal substructure. A statistically-significant galaxy-galaxy lensing signal has also been seen for the cluster members. Further work will relate radial dependencies in the dark matter and halo masses in the context of spectroscopic and morphological diagnostics of truncated star formation.

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