X-Ray Properties of the First Sunyaev-Zel'dovich Effect Selected Galaxy Cluster Sample from the South Pole Telescope
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^2 of sky...
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ftcaltechauth:oai:authors.library.caltech.edu:25258 2023-05-15T18:22:26+02:00 X-Ray Properties of the First Sunyaev-Zel'dovich Effect Selected Galaxy Cluster Sample from the South Pole Telescope Andersson, K. Vieira, J. D. 2011-09-01 application/pdf https://authors.library.caltech.edu/25258/ https://authors.library.caltech.edu/25258/1/Andersson2011p15683Astrophys_J.pdf https://resolver.caltech.edu/CaltechAUTHORS:20110908-120921426 en eng American Astronomical Society https://authors.library.caltech.edu/25258/1/Andersson2011p15683Astrophys_J.pdf Andersson, K. and Vieira, J. D. (2011) X-Ray Properties of the First Sunyaev-Zel'dovich Effect Selected Galaxy Cluster Sample from the South Pole Telescope. Astrophysical Journal, 738 (1). Art. No. 48. ISSN 0004-637X. doi:10.1088/0004-637X/738/1/48. https://resolver.caltech.edu/CaltechAUTHORS:20110908-120921426 <https://resolver.caltech.edu/CaltechAUTHORS:20110908-120921426> other Article PeerReviewed 2011 ftcaltechauth https://doi.org/10.1088/0004-637X/738/1/48 2021-11-11T18:47:41Z 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^2 of sky surveyed by the South Pole Telescope (SPT). Using X-ray observations with Chandra and XMM-Newton, we estimate the temperature, T_X, and mass, M_g, of the intracluster medium within r_500 for each cluster. From these, we calculate Y_X = M_(g)T_X and estimate the total cluster mass using an M_(500)-Y_X scaling relation measured from previous X-ray studies. The integrated Comptonization, Y 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_(SZ)-Y_X relation and find a normalization of 0.82 ± 0.07, marginally consistent with the predicted ratio of Y_(SZ)/Y_X = 0.91 ± 0.01 that would be expected from the density and temperature models used in this work. Using the Y_X-derived mass estimates, we fit a Y_(SZ)-M_500 relation and find a slope consistent with the self-similar expectation of Y_(SZ) ∝ M^(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 1.3σ when considering the ~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. Article in Journal/Newspaper South pole Caltech Authors (California Institute of Technology) South Pole The Astrophysical Journal 738 1 48 |
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Caltech Authors (California Institute of Technology) |
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ftcaltechauth |
language |
English |
description |
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^2 of sky surveyed by the South Pole Telescope (SPT). Using X-ray observations with Chandra and XMM-Newton, we estimate the temperature, T_X, and mass, M_g, of the intracluster medium within r_500 for each cluster. From these, we calculate Y_X = M_(g)T_X and estimate the total cluster mass using an M_(500)-Y_X scaling relation measured from previous X-ray studies. The integrated Comptonization, Y 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_(SZ)-Y_X relation and find a normalization of 0.82 ± 0.07, marginally consistent with the predicted ratio of Y_(SZ)/Y_X = 0.91 ± 0.01 that would be expected from the density and temperature models used in this work. Using the Y_X-derived mass estimates, we fit a Y_(SZ)-M_500 relation and find a slope consistent with the self-similar expectation of Y_(SZ) ∝ M^(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 1.3σ when considering the ~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. |
format |
Article in Journal/Newspaper |
author |
Andersson, K. Vieira, J. D. |
spellingShingle |
Andersson, K. Vieira, J. D. X-Ray Properties of the First Sunyaev-Zel'dovich Effect Selected Galaxy Cluster Sample from the South Pole Telescope |
author_facet |
Andersson, K. Vieira, J. D. |
author_sort |
Andersson, K. |
title |
X-Ray Properties of the First Sunyaev-Zel'dovich Effect Selected Galaxy Cluster Sample from the South Pole Telescope |
title_short |
X-Ray Properties of the First Sunyaev-Zel'dovich Effect Selected Galaxy Cluster Sample from the South Pole Telescope |
title_full |
X-Ray Properties of the First Sunyaev-Zel'dovich Effect Selected Galaxy Cluster Sample from the South Pole Telescope |
title_fullStr |
X-Ray Properties of the First Sunyaev-Zel'dovich Effect Selected Galaxy Cluster Sample from the South Pole Telescope |
title_full_unstemmed |
X-Ray Properties of the First Sunyaev-Zel'dovich Effect Selected Galaxy Cluster Sample from the South Pole Telescope |
title_sort |
x-ray properties of the first sunyaev-zel'dovich effect selected galaxy cluster sample from the south pole telescope |
publisher |
American Astronomical Society |
publishDate |
2011 |
url |
https://authors.library.caltech.edu/25258/ https://authors.library.caltech.edu/25258/1/Andersson2011p15683Astrophys_J.pdf https://resolver.caltech.edu/CaltechAUTHORS:20110908-120921426 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
https://authors.library.caltech.edu/25258/1/Andersson2011p15683Astrophys_J.pdf Andersson, K. and Vieira, J. D. (2011) X-Ray Properties of the First Sunyaev-Zel'dovich Effect Selected Galaxy Cluster Sample from the South Pole Telescope. Astrophysical Journal, 738 (1). Art. No. 48. ISSN 0004-637X. doi:10.1088/0004-637X/738/1/48. https://resolver.caltech.edu/CaltechAUTHORS:20110908-120921426 <https://resolver.caltech.edu/CaltechAUTHORS:20110908-120921426> |
op_rights |
other |
op_doi |
https://doi.org/10.1088/0004-637X/738/1/48 |
container_title |
The Astrophysical Journal |
container_volume |
738 |
container_issue |
1 |
container_start_page |
48 |
_version_ |
1766201847687675904 |