The DEEP2 Galaxy Redshift Survey: First results on galaxy groups

Abstract

We use the first 25% of the DEEP2 Galaxy Redshift Survey spectroscopic data to identify groups and clusters of galaxies in redshift space. The data set contains 8370 galaxies with confirmed redshifts in the range 0.7 <= z <= 1.4, over one square degree on the sky. Groups are identified using an algorithm (the Voronoi-Delaunay Method) that has been shown to accurately reproduce the statistics of groups in simulated DEEP2-like samples. We optimize this algorithm for the DEEP2 survey by applying it to realistic mock galaxy catalogs and assessing the results using a stringent set of criteria for measuring group-finding success, which we develop and describe in detail here. We find in particular that the group-finder can successfully identify ~78% of real groups and that ~79% of the galaxies that are true members of groups can be identified as such. Conversely, we estimate that ~55% of the groups we find can be definitively identified with real groups and that ~46% of the galaxies we place into groups are interloper field galaxies. Most importantly, we find that it is possible to measure the distribution of groups in redshift and velocity dispersion, n(sigma,z), to an accuracy limited by cosmic variance, for dispersions greater than 350km/s. We anticipate that such measurements will allow strong constraints to be placed on the equation of state of the dark energy in the future. Finally, we present the first DEEP2 group catalog, which assigns 32% of the galaxies to 899 distinct groups with two or more members, 153 of which have velocity dispersions above 350km/s. We provide locations, redshifts and properties for this high-dispersion subsample. This catalog represents the largest sample to date of spectroscopically detected groups at z~1.

19 pages, 13 figures, 3 tables. v1: Submitted to ApJ v2: Updated with minor changes to agree with version to appear in ApJ

References in corpus (33)

• The 2dF Galaxy Redshift Survey: Spectra and redshifts
• Statistical Properties of X-ray Clusters: Analytic and Numerical Comparisons
• Analytic model for galaxy and dark matter clustering
• Using the Evolution of Clusters to Constrain Omega
• Halo occupation numbers and galaxy bias
• Constraints on dark energy from Chandra observations of the largest relaxed galaxy clusters
• Constraining Galaxy Formation and Cosmology with the Conditional Luminosity Function of Galaxies
• Science Objectives and Early Results of the DEEP2 Redshift Survey
• The Evolution of X-ray Clusters of Galaxies
• Weak Gravitational Lensing by Large-Scale Structure
• Constraints on Cosmological Parameters from Future Galaxy Cluster Surveys
• A Halo-Based Galaxy Group Finder: Calibration and Application to the 2dFGRS
• Galaxy groups in the 2dFGRS: the group-finding algorithm and the 2PIGG catalogue
• The Halo Occupation Distribution and the Physics of Galaxy Formation
• Velocity and spatial biases in CDM subhalo distributions
• Caltech Faint Galaxy Redshift Survey X: A Redshift Survey in the Region of the Hubble Deep Field North
• The Dark Matter Distribution in the Central Regions of Galaxy Clusters: Implications for CDM
• The Dark Matter Distribution in the Central Regions of Galaxy Clusters
• Constraints on Omega_m, Omega_L, and Sigma_8, from Galaxy Cluster Redshift Distributions
• The 2dF Galaxy Redshift Survey: galaxy clustering per spectral type
• The Mass-To-Light Function of Virialized Systems and the Relationship Between Their Optical and X-ray Properties
• The DEEP2 Galaxy Redshift Survey: Clustering of Galaxies in Early Data
• Evolution and Color-Dependence of the Galaxy Angular Correlation Function: 350,000 Galaxies in 5 Square Degrees
• An Automated Cluster Finder: the Adaptive Matched Filter
• The Las Campanas Distant Cluster Survey - The Catalog
• Galaxy Groups at Intermediate Redshift
• Three-Dimensional Identification and Reconstruction of Galaxy Systems within Deep Redshift Surveys
• Velocity Dispersions of CNOC Clusters and the Evolution of the Cluster Abundance
• Mock Catalogs for the DEEP2 redshift survey
• Completeness in Photometric and Spectroscopic Searches for Clusters
• Testing the Accuracy of Redshift Space Group Finding Algorithms
• Measuring the Cosmic Equation of State with Galaxy Clusters in the DEEP2 Redshift Survey
• Effects of Sampling on Measuring Galaxy Count Probabilities

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• The matter distribution in the local Universe as derived from galaxy groups in SDSS DR12 and 2MRS
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• Evolution of Group Galaxies from the First Red-Sequence Cluster Survey
• The Variation of the Galaxy Luminosity Function with Group Properties
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• Improved Mock Galaxy Catalogs for the DEEP2 Galaxy Redshift Survey from Subhalo Abundance and Environment Matching
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• Astrophysics in 2005
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