Testing for X-Ray–SZ Differences and Redshift Evolution in the X-Ray Morphology of Galaxy Clusters
We present a quantitative study of the X-ray morphology of galaxy clusters, as a function of their detection method and redshift. We analyze two separate samples of galaxy clusters: a sample of 36 clusters at 0.35 < z < 0.9 selected in the X-ray with the ROSAT PSPC 400 deg 2 survey, and a...
| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Article |
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IOP Publishing
2017
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| Online Access: | http://hdl.handle.net/1721.1/112105 https://orcid.org/0000-0001-5226-8349 |
| _version_ | 1826195302304972800 |
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| author | Nurgaliev, D. Benson, B. A. Bleem, L. Bocquet, S. Forman, W. R. Garmire, G. P. Gupta, N. Hlavacek-Larrondo, J. Mohr, J. J. Nagai, D. Rapetti, D. Stark, A. A. Stubbs, C. W. Vikhlinin, A. McDonald, Michael A. |
| author2 | MIT Kavli Institute for Astrophysics and Space Research |
| author_facet | MIT Kavli Institute for Astrophysics and Space Research Nurgaliev, D. Benson, B. A. Bleem, L. Bocquet, S. Forman, W. R. Garmire, G. P. Gupta, N. Hlavacek-Larrondo, J. Mohr, J. J. Nagai, D. Rapetti, D. Stark, A. A. Stubbs, C. W. Vikhlinin, A. McDonald, Michael A. |
| author_sort | Nurgaliev, D. |
| collection | MIT |
| description | We present a quantitative study of the X-ray morphology of galaxy clusters, as a function of their detection method and redshift. We analyze two separate samples of galaxy clusters: a sample of 36 clusters at 0.35 < z < 0.9 selected in the X-ray with the ROSAT PSPC 400 deg 2 survey, and a sample of 90 clusters at 0.25 < z < 1.2 selected via the Sunyaev-Zel'dovich (SZ) effect with the South Pole Telescope. Clusters from both samples have similar-quality Chandra observations, which allow us to quantify their X-ray morphologies via two distinct methods: centroid shifts (w) and photon asymmetry (A phot ). The latter technique provides nearly unbiased morphology estimates for clusters spanning a broad range of redshift and data quality. We further compare the X-ray morphologies of X-ray- and SZ-selected clusters with those of simulated clusters. We do not find a statistically significant difference in the measured X-ray morphology of X-ray and SZ-selected clusters over the redshift range probed by these samples, suggesting that the two are probing similar populations of clusters. We find that the X-ray morphologies of simulated clusters are statistically indistinguishable from those of X-ray- or SZ-selected clusters, implying that the most important physics for dictating the large-scale gas morphology (outside of the core) is well-approximated in these simulations. Finally, we find no statistically significant redshift evolution in the X-ray morphology (both for observed and simulated clusters), over the range of z ∼ 0.3 to z ∼ 1, seemingly in contradiction with the redshift-dependent halo merger rate predicted by simulations. |
| first_indexed | 2024-09-23T10:10:34Z |
| format | Article |
| id | mit-1721.1/112105 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T10:10:34Z |
| publishDate | 2017 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/1121052022-09-26T16:14:40Z Testing for X-Ray–SZ Differences and Redshift Evolution in the X-Ray Morphology of Galaxy Clusters Nurgaliev, D. Benson, B. A. Bleem, L. Bocquet, S. Forman, W. R. Garmire, G. P. Gupta, N. Hlavacek-Larrondo, J. Mohr, J. J. Nagai, D. Rapetti, D. Stark, A. A. Stubbs, C. W. Vikhlinin, A. McDonald, Michael A. MIT Kavli Institute for Astrophysics and Space Research McDonald, Michael A. We present a quantitative study of the X-ray morphology of galaxy clusters, as a function of their detection method and redshift. We analyze two separate samples of galaxy clusters: a sample of 36 clusters at 0.35 < z < 0.9 selected in the X-ray with the ROSAT PSPC 400 deg 2 survey, and a sample of 90 clusters at 0.25 < z < 1.2 selected via the Sunyaev-Zel'dovich (SZ) effect with the South Pole Telescope. Clusters from both samples have similar-quality Chandra observations, which allow us to quantify their X-ray morphologies via two distinct methods: centroid shifts (w) and photon asymmetry (A phot ). The latter technique provides nearly unbiased morphology estimates for clusters spanning a broad range of redshift and data quality. We further compare the X-ray morphologies of X-ray- and SZ-selected clusters with those of simulated clusters. We do not find a statistically significant difference in the measured X-ray morphology of X-ray and SZ-selected clusters over the redshift range probed by these samples, suggesting that the two are probing similar populations of clusters. We find that the X-ray morphologies of simulated clusters are statistically indistinguishable from those of X-ray- or SZ-selected clusters, implying that the most important physics for dictating the large-scale gas morphology (outside of the core) is well-approximated in these simulations. Finally, we find no statistically significant redshift evolution in the X-ray morphology (both for observed and simulated clusters), over the range of z ∼ 0.3 to z ∼ 1, seemingly in contradiction with the redshift-dependent halo merger rate predicted by simulations. United States. National Aeronautics and Space Administration (Award 13800883) United States. National Aeronautics and Space Administration (Award 16800690) 2017-11-01T15:48:43Z 2017-11-01T15:48:43Z 2017-05 2017-04 2017-10-19T15:31:57Z Article http://purl.org/eprint/type/JournalArticle 1538-4357 0004-6256 http://hdl.handle.net/1721.1/112105 Nurgaliev, D. et al. “Testing for X-Ray–SZ Differences and Redshift Evolution in the X-Ray Morphology of Galaxy Clusters.” The Astrophysical Journal 841, 1 (May 2017): 5. © 2017 The American Astronomical Society. All rights reserved. https://orcid.org/0000-0001-5226-8349 http://dx.doi.org/10.3847/1538-4357/aa6db4 Astrophysical Journal Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf IOP Publishing IOP Publishing |
| spellingShingle | Nurgaliev, D. Benson, B. A. Bleem, L. Bocquet, S. Forman, W. R. Garmire, G. P. Gupta, N. Hlavacek-Larrondo, J. Mohr, J. J. Nagai, D. Rapetti, D. Stark, A. A. Stubbs, C. W. Vikhlinin, A. McDonald, Michael A. Testing for X-Ray–SZ Differences and Redshift Evolution in the X-Ray Morphology of Galaxy Clusters |
| title | Testing for X-Ray–SZ Differences and Redshift Evolution in the X-Ray Morphology of Galaxy Clusters |
| title_full | Testing for X-Ray–SZ Differences and Redshift Evolution in the X-Ray Morphology of Galaxy Clusters |
| title_fullStr | Testing for X-Ray–SZ Differences and Redshift Evolution in the X-Ray Morphology of Galaxy Clusters |
| title_full_unstemmed | Testing for X-Ray–SZ Differences and Redshift Evolution in the X-Ray Morphology of Galaxy Clusters |
| title_short | Testing for X-Ray–SZ Differences and Redshift Evolution in the X-Ray Morphology of Galaxy Clusters |
| title_sort | testing for x ray sz differences and redshift evolution in the x ray morphology of galaxy clusters |
| url | http://hdl.handle.net/1721.1/112105 https://orcid.org/0000-0001-5226-8349 |
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