ar X iv : a st ro - p h / 99 07 40 4 v 1 2 8 Ju l 1 99 9 Photometric Redshifts : A New Tool for Studying High - Redshift Clusters

ar X iv : a st ro - p h / 99 07 40 3 v 1 2 8 Ju l 1 99 9 Evolution in the Clustering of Galaxies for Z < 1

Measuring the evolution in the clustering of galaxies over a large redshift range is a challenging problem. For a two-dimensional galaxy catalog, however, we can measure the galaxy-galaxy angular correlation function which provides information on the density distribution of galaxies. By utilizing photometric redshifts, we can measure the angular correlation function in redshift shells (Brunner ...

ar X iv : a st ro - p h / 98 03 12 5 v 1 1 1 M ar 1 99 8 An Automated Cluster Finder : the Adaptive Matched Filter

We describe an automated method for detecting clusters of galaxies in imaging and redshift galaxy surveys. The Adaptive Matched Filter (AMF) method utilizes galaxy positions, magnitudes, and—when available—photometric or spectroscopic redshifts to find clusters and determine their redshift and richness. The AMF can be applied to most types of galaxy surveys: from two-dimensional (2D) imaging su...

ar X iv : a st ro - p h / 98 01 07 4 v 1 9 J an 1 99 8 Simulating Gas at High Redshift

We discuss simulations of gas at high redshift. We briefly review the methods used and the results for quasar absorption lines. We present gas mass functions and galaxy correlation functions for 5 different cosmological models. Galaxies should be detectable at redshifts greater than 2 by SKAI, and measurements of the gas mass functions and galaxy correlation functions could be used to discrimin...

ar X iv : a st ro - p h / 99 02 29 8 v 2 1 3 A pr 1 99 9 New limits on Ω Λ and Ω M from old galaxies at high redshift

ar X iv : a st ro - p h / 00 10 49 8 v 1 2 4 O ct 2 00 0 Clusters of Galaxies in the 2 dF Galaxy Redshift Survey ⋆

The 2dF Galaxy Redshift Survey has obtained 135,000 redshifts for galaxies in two broad strips. Here we present the first results of a 3-dimensional search for galaxy clusters based on known 2-dimensional compilations. We derive new redshifts and velocity dispersions for clusters, assess the level of contamination in the sample, analyze the accuracy of photometric redshift estimates and study t...