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Title: OPTICAL REDSHIFT AND RICHNESS ESTIMATES FOR GALAXY CLUSTERS SELECTED WITH THE SUNYAEV-Zel'dovich EFFECT FROM 2008 SOUTH POLE TELESCOPE OBSERVATIONS

Abstract

We present redshifts and optical richness properties of 21 galaxy clusters uniformly selected by their Sunyaev-Zel'dovich (SZ) signature. These clusters, plus an additional, unconfirmed candidate, were detected in a 178 deg{sup 2} area surveyed by the South Pole Telescope (SPT) in 2008. Using griz imaging from the Blanco Cosmology Survey and from pointed Magellan telescope observations, as well as spectroscopy using Magellan facilities, we confirm the existence of clustered red-sequence galaxies, report red-sequence photometric redshifts, present spectroscopic redshifts for a subsample, and derive R{sub 200} radii and M{sub 200} masses from optical richness. The clusters span redshifts from 0.15 to greater than 1, with a median redshift of 0.74; three clusters are estimated to be at z>1. Redshifts inferred from mean red-sequence colors exhibit 2% rms scatter in {sigma}{sub z}/(1 + z) with respect to the spectroscopic subsample for z < 1. We show that the M{sub 200} cluster masses derived from optical richness correlate with masses derived from SPT data and agree with previously derived scaling relations to within the uncertainties. Optical and infrared imaging is an efficient means of cluster identification and redshift estimation in large SZ surveys, and exploiting the same data for richness measurements, as wemore » have done, will be useful for constraining cluster masses and radii for large samples in cosmological analysis.« less

Authors:
;  [1];  [2];  [3];  [4]; ;  [5];  [6];  [7];  [8];  [9];  [10]; ; ; ; ;  [11]; ;  [12];  [13]
  1. Department of Physics, Harvard University, 17 Oxford Street, Cambridge, MA 02138 (United States)
  2. Department of Astronomy, University of Illinois, 1002 West Green Street, Urbana, IL 61801 (United States)
  3. Department of Physics and Astronomy, Cardiff University, CF24 3YB (United Kingdom)
  4. University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637 (United States)
  5. Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510 (United States)
  6. National Center for Supercomputing Applications, University of Illinois, 1205 West Clark Street, Urbana, IL 61801 (United States)
  7. Department of Physics and Astrophysics, University of North Dakota, Grand Forks, ND 58202 (United States)
  8. Department of Physics, University of California, Berkeley, CA 94720 (United States)
  9. Institut dAstrophysique de Paris, 98bis bd Arago, F-75014 Paris (France)
  10. Los Alamos National Laboratory, Los Alamos, New Mexico, NM 87545 (United States)
  11. Kavli Institute for Cosmological Physics, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637 (United States)
  12. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
  13. Department of Physics, McGill University, 3600 Rue University, Montreal, Quebec H3A 2T8 (Canada)
Publication Date:
OSTI Identifier:
21471232
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 723; Journal Issue: 2; Other Information: DOI: 10.1088/0004-637X/723/2/1736
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMOLOGY; GALAXIES; GALAXY CLUSTERS; MASS; RED SHIFT; SPECTROSCOPY; TELESCOPES

Citation Formats

High, F. W., Stalder, B., Song, J., Ade, P. A. R., Aird, K. A., Allam, S. S., Buckley-Geer, E. J., Armstrong, R., Barkhouse, W. A., Benson, B. A., Bertin, E., Bhattacharya, S., Bleem, L. E., Carlstrom, J. E., Chang, C. L., Crawford, T. M., Crites, A. T., Brodwin, M., Challis, P., and De Haan, T., E-mail: high@physics.harvard.ed. OPTICAL REDSHIFT AND RICHNESS ESTIMATES FOR GALAXY CLUSTERS SELECTED WITH THE SUNYAEV-Zel'dovich EFFECT FROM 2008 SOUTH POLE TELESCOPE OBSERVATIONS. United States: N. p., 2010. Web. doi:10.1088/0004-637X/723/2/1736.
High, F. W., Stalder, B., Song, J., Ade, P. A. R., Aird, K. A., Allam, S. S., Buckley-Geer, E. J., Armstrong, R., Barkhouse, W. A., Benson, B. A., Bertin, E., Bhattacharya, S., Bleem, L. E., Carlstrom, J. E., Chang, C. L., Crawford, T. M., Crites, A. T., Brodwin, M., Challis, P., & De Haan, T., E-mail: high@physics.harvard.ed. OPTICAL REDSHIFT AND RICHNESS ESTIMATES FOR GALAXY CLUSTERS SELECTED WITH THE SUNYAEV-Zel'dovich EFFECT FROM 2008 SOUTH POLE TELESCOPE OBSERVATIONS. United States. doi:10.1088/0004-637X/723/2/1736.
High, F. W., Stalder, B., Song, J., Ade, P. A. R., Aird, K. A., Allam, S. S., Buckley-Geer, E. J., Armstrong, R., Barkhouse, W. A., Benson, B. A., Bertin, E., Bhattacharya, S., Bleem, L. E., Carlstrom, J. E., Chang, C. L., Crawford, T. M., Crites, A. T., Brodwin, M., Challis, P., and De Haan, T., E-mail: high@physics.harvard.ed. Wed . "OPTICAL REDSHIFT AND RICHNESS ESTIMATES FOR GALAXY CLUSTERS SELECTED WITH THE SUNYAEV-Zel'dovich EFFECT FROM 2008 SOUTH POLE TELESCOPE OBSERVATIONS". United States. doi:10.1088/0004-637X/723/2/1736.
@article{osti_21471232,
title = {OPTICAL REDSHIFT AND RICHNESS ESTIMATES FOR GALAXY CLUSTERS SELECTED WITH THE SUNYAEV-Zel'dovich EFFECT FROM 2008 SOUTH POLE TELESCOPE OBSERVATIONS},
author = {High, F. W. and Stalder, B. and Song, J. and Ade, P. A. R. and Aird, K. A. and Allam, S. S. and Buckley-Geer, E. J. and Armstrong, R. and Barkhouse, W. A. and Benson, B. A. and Bertin, E. and Bhattacharya, S. and Bleem, L. E. and Carlstrom, J. E. and Chang, C. L. and Crawford, T. M. and Crites, A. T. and Brodwin, M. and Challis, P. and De Haan, T., E-mail: high@physics.harvard.ed},
abstractNote = {We present redshifts and optical richness properties of 21 galaxy clusters uniformly selected by their Sunyaev-Zel'dovich (SZ) signature. These clusters, plus an additional, unconfirmed candidate, were detected in a 178 deg{sup 2} area surveyed by the South Pole Telescope (SPT) in 2008. Using griz imaging from the Blanco Cosmology Survey and from pointed Magellan telescope observations, as well as spectroscopy using Magellan facilities, we confirm the existence of clustered red-sequence galaxies, report red-sequence photometric redshifts, present spectroscopic redshifts for a subsample, and derive R{sub 200} radii and M{sub 200} masses from optical richness. The clusters span redshifts from 0.15 to greater than 1, with a median redshift of 0.74; three clusters are estimated to be at z>1. Redshifts inferred from mean red-sequence colors exhibit 2% rms scatter in {sigma}{sub z}/(1 + z) with respect to the spectroscopic subsample for z < 1. We show that the M{sub 200} cluster masses derived from optical richness correlate with masses derived from SPT data and agree with previously derived scaling relations to within the uncertainties. Optical and infrared imaging is an efficient means of cluster identification and redshift estimation in large SZ surveys, and exploiting the same data for richness measurements, as we have done, will be useful for constraining cluster masses and radii for large samples in cosmological analysis.},
doi = {10.1088/0004-637X/723/2/1736},
journal = {Astrophysical Journal},
number = 2,
volume = 723,
place = {United States},
year = {Wed Nov 10 00:00:00 EST 2010},
month = {Wed Nov 10 00:00:00 EST 2010}
}