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The Complex Structure of the Cl 1604 Supercluster at z ~ 0.9

Gal, R. R. and Lemaux, B. C. and Lubin, L. M. and Kocevski, D. and Squires, G. K. (2008) The Complex Structure of the Cl 1604 Supercluster at z ~ 0.9. Astrophysical Journal, 684 (2). pp. 933-956. ISSN 0004-637X. doi:10.1086/590416.

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The Cl 1604 supercluster at z = 0.9 is one of a small handful of such structures discovered in the high-redshift universe and is the first target observed as part of the Observations of Redshift Evolution in Large Scale Environments (ORELSE) survey. To date, Cl 1604 is the largest structure mapped at z ~ 1, with the most constituent clusters and the largest number of spectroscopically confirmed member galaxies. In this paper we present the results of a spectroscopic campaign to create a three-dimensional map of Cl 1604 and to understand the contamination by foreground and background large-scale structures. Combining new Deep Imaging Multi-Object Spectrograph observations with previous data yields high-quality redshifts for 1138 extragalactic objects in a ~0.08 deg^2 region, 413 of which are supercluster members. We examine the complex three-dimensional structure of Cl 1604, providing velocity dispersions for eight of the member clusters and groups. Our extensive spectroscopic data set is used to examine potential biases in cluster velocity dispersion measurements in the presence of overlapping structures and filaments. We also discuss other structures found along the line of sight, including a filament at z = 0.6 and two serendipitously discovered groups at z ~ 1.2.

Item Type:Article
Related URLs:
URLURL TypeDescription
Lemaux, B. C.0000-0002-1428-7036
Squires, G. K.0000-0002-1977-5717
Additional Information:© 2008. The American Astronomical Society. Received 2007 October 10; accepted 2008 May 27. This material is based on work supported by the National Aeronautics and Space Administration under award NNG05GC34ZG for the Long Term Space Astrophysics Program. Support for program HST-GO-08560.05-A was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. The spectrographic data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W.M. Keck Foundation. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Mauna Kea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain. The observing staff, telescope operators, and instrument scientists at Keck provided a great deal of assistance. We would also like to thank the DEEP2 team for making their software available to us, and especially M. Cooper for his assistance with implementation.
Funding AgencyGrant Number
Space Telescope Science InstituteHST-GO-08560.05-A
NASANAS 5-26555
W.M. Keck FoundationUNSPECIFIED
Subject Keywords:catalogs of galaxies; large scale structure of the universe
Issue or Number:2
Record Number:CaltechAUTHORS:GALRRapj08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11833
Deposited By: Archive Administrator
Deposited On:02 Oct 2008 22:03
Last Modified:08 Nov 2021 22:22

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