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Title: X-RAY PROPERTIES OF THE FIRST SUNYAEV-ZEL'DOVICH EFFECT SELECTED GALAXY CLUSTER SAMPLE FROM THE SOUTH POLE TELESCOPE

Abstract

We present results of X-ray observations of a sample of 15 clusters selected via their imprint on the cosmic microwave background from the thermal Sunyaev-Zel'dovich (SZ) effect. These clusters are a subset of the first SZ-selected cluster catalog, obtained from observations of 178 deg{sup 2} of sky surveyed by the South Pole Telescope (SPT). Using X-ray observations with Chandra and XMM-Newton, we estimate the temperature, T{sub X} , and mass, M{sub g} , of the intracluster medium within r{sub 500} for each cluster. From these, we calculate Y{sub X} = M{sub g}T{sub X} and estimate the total cluster mass using an M{sub 500}-Y{sub X} scaling relation measured from previous X-ray studies. The integrated Comptonization, Y{sub SZ}, is derived from the SZ measurements, using additional information from the X-ray-measured gas density profiles and a universal temperature profile. We calculate scaling relations between the X-ray and SZ observables and find results generally consistent with other measurements and the expectations from simple self-similar behavior. Specifically, we fit a Y{sub SZ}-Y{sub X} relation and find a normalization of 0.82 {+-} 0.07, marginally consistent with the predicted ratio of Y{sub SZ}/Y{sub X} = 0.91 {+-} 0.01 that would be expected from the density and temperaturemore » models used in this work. Using the Y{sub X} -derived mass estimates, we fit a Y{sub SZ}-M{sub 500} relation and find a slope consistent with the self-similar expectation of Y{sub SZ}{proportional_to}M {sup 5/3} with a normalization consistent with predictions from other X-ray studies. We find that the SZ mass estimates, derived from cosmological simulations of the SPT survey, are lower by a factor of 0.78 {+-} 0.06 relative to the X-ray mass estimates. This offset is at a level of 1.3{sigma} when considering the {approx}15% systematic uncertainty for the simulation-based SZ masses. Overall, the X-ray measurements confirm that the scaling relations of the SZ-selected clusters are consistent with the properties of other X-ray-selected samples of massive clusters, even allowing for the broad redshift range (0.29 < z < 1.08) of the sample.« less

Authors:
;  [1]; ; ; ; ; ;  [2];  [3];  [4]; ;  [5]; ; ;  [6]; ; ;  [7];  [8];  [9]
  1. MIT Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139 (United States)
  2. Kavli Institute for Cosmological Physics, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637 (United States)
  3. Department of Physics and Astronomy, Cardiff University, CF24 3YB (United Kingdom)
  4. Department of Astronomy and Astrophysics, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637 (United States)
  5. Department of Astronomy, University of Illinois, 1002 West Green Street, Urbana, IL 61801 (United States)
  6. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
  7. Department of Physics, McGill University, 3600 Rue University, Montreal, Quebec H3A 2T8 (Canada)
  8. Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802 (United States)
  9. Department of Physics, University of California, Berkeley, CA 94720 (United States)
Publication Date:
OSTI Identifier:
21582932
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 738; Journal Issue: 1; Other Information: DOI: 10.1088/0004-637X/738/1/48
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; GALAXY CLUSTERS; MASS; RELICT RADIATION; SCALING; X RADIATION; X-RAY GALAXIES; COSMIC RAY SOURCES; COSMIC X-RAY SOURCES; ELECTROMAGNETIC RADIATION; GALAXIES; IONIZING RADIATIONS; MICROWAVE RADIATION; RADIATIONS

Citation Formats

Andersson, K., Bautz, M., Benson, B. A., Bleem, L. E., Carlstrom, J. E., Chang, C. L., Crawford, T. M., Crites, A. T., Ade, P. A. R., Aird, K. A., Armstrong, B., Desai, S., Brodwin, M., Foley, R. J., Forman, W. R., De Haan, T., Dobbs, M. A., Dudley, J. P., Garmire, G., and George, E. M., E-mail: kanderss@space.mit.edu. X-RAY PROPERTIES OF THE FIRST SUNYAEV-ZEL'DOVICH EFFECT SELECTED GALAXY CLUSTER SAMPLE FROM THE SOUTH POLE TELESCOPE. United States: N. p., 2011. Web. doi:10.1088/0004-637X/738/1/48.
Andersson, K., Bautz, M., Benson, B. A., Bleem, L. E., Carlstrom, J. E., Chang, C. L., Crawford, T. M., Crites, A. T., Ade, P. A. R., Aird, K. A., Armstrong, B., Desai, S., Brodwin, M., Foley, R. J., Forman, W. R., De Haan, T., Dobbs, M. A., Dudley, J. P., Garmire, G., & George, E. M., E-mail: kanderss@space.mit.edu. X-RAY PROPERTIES OF THE FIRST SUNYAEV-ZEL'DOVICH EFFECT SELECTED GALAXY CLUSTER SAMPLE FROM THE SOUTH POLE TELESCOPE. United States. doi:10.1088/0004-637X/738/1/48.
Andersson, K., Bautz, M., Benson, B. A., Bleem, L. E., Carlstrom, J. E., Chang, C. L., Crawford, T. M., Crites, A. T., Ade, P. A. R., Aird, K. A., Armstrong, B., Desai, S., Brodwin, M., Foley, R. J., Forman, W. R., De Haan, T., Dobbs, M. A., Dudley, J. P., Garmire, G., and George, E. M., E-mail: kanderss@space.mit.edu. Thu . "X-RAY PROPERTIES OF THE FIRST SUNYAEV-ZEL'DOVICH EFFECT SELECTED GALAXY CLUSTER SAMPLE FROM THE SOUTH POLE TELESCOPE". United States. doi:10.1088/0004-637X/738/1/48.
@article{osti_21582932,
title = {X-RAY PROPERTIES OF THE FIRST SUNYAEV-ZEL'DOVICH EFFECT SELECTED GALAXY CLUSTER SAMPLE FROM THE SOUTH POLE TELESCOPE},
author = {Andersson, K. and Bautz, M. and Benson, B. A. and Bleem, L. E. and Carlstrom, J. E. and Chang, C. L. and Crawford, T. M. and Crites, A. T. and Ade, P. A. R. and Aird, K. A. and Armstrong, B. and Desai, S. and Brodwin, M. and Foley, R. J. and Forman, W. R. and De Haan, T. and Dobbs, M. A. and Dudley, J. P. and Garmire, G. and George, E. M., E-mail: kanderss@space.mit.edu},
abstractNote = {We present results of X-ray observations of a sample of 15 clusters selected via their imprint on the cosmic microwave background from the thermal Sunyaev-Zel'dovich (SZ) effect. These clusters are a subset of the first SZ-selected cluster catalog, obtained from observations of 178 deg{sup 2} of sky surveyed by the South Pole Telescope (SPT). Using X-ray observations with Chandra and XMM-Newton, we estimate the temperature, T{sub X} , and mass, M{sub g} , of the intracluster medium within r{sub 500} for each cluster. From these, we calculate Y{sub X} = M{sub g}T{sub X} and estimate the total cluster mass using an M{sub 500}-Y{sub X} scaling relation measured from previous X-ray studies. The integrated Comptonization, Y{sub SZ}, is derived from the SZ measurements, using additional information from the X-ray-measured gas density profiles and a universal temperature profile. We calculate scaling relations between the X-ray and SZ observables and find results generally consistent with other measurements and the expectations from simple self-similar behavior. Specifically, we fit a Y{sub SZ}-Y{sub X} relation and find a normalization of 0.82 {+-} 0.07, marginally consistent with the predicted ratio of Y{sub SZ}/Y{sub X} = 0.91 {+-} 0.01 that would be expected from the density and temperature models used in this work. Using the Y{sub X} -derived mass estimates, we fit a Y{sub SZ}-M{sub 500} relation and find a slope consistent with the self-similar expectation of Y{sub SZ}{proportional_to}M {sup 5/3} with a normalization consistent with predictions from other X-ray studies. We find that the SZ mass estimates, derived from cosmological simulations of the SPT survey, are lower by a factor of 0.78 {+-} 0.06 relative to the X-ray mass estimates. This offset is at a level of 1.3{sigma} when considering the {approx}15% systematic uncertainty for the simulation-based SZ masses. Overall, the X-ray measurements confirm that the scaling relations of the SZ-selected clusters are consistent with the properties of other X-ray-selected samples of massive clusters, even allowing for the broad redshift range (0.29 < z < 1.08) of the sample.},
doi = {10.1088/0004-637X/738/1/48},
journal = {Astrophysical Journal},
number = 1,
volume = 738,
place = {United States},
year = {Thu Sep 01 00:00:00 EDT 2011},
month = {Thu Sep 01 00:00:00 EDT 2011}
}