Comparison of pressure profiles of massive relaxed galaxy clusters using the Sunyaev–Zel'dovich and x-ray data
Comparison of pressure profiles of massive relaxed galaxy clusters using the Sunyaev–Zel'dovich and x-ray data
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DOI：
10.1088/1367-2630/14/2/025010
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发表时间：
2011-12
影响因子：
3.3
通讯作者：
M. Bonamente;N. Hasler;E. Bulbul;J. Carlstrom;T. Culverhouse;M. Gralla;C. Greer;D. Hawkins;R. Hennessy;M. Joy;J. Kolodziejczak;J. Lamb;D. Landry;E. Leitch;D. Marrone;Amber D. Miller;T. Mroczkowski;S. Muchovej;T. Plagge;C. Pryke;M. Sharp;D. Woody
中科院分区：
文献类型：
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作者：
M. Bonamente;N. Hasler;E. Bulbul;J. Carlstrom;T. Culverhouse;M. Gralla;C. Greer;D. Hawkins;R. Hennessy;M. Joy;J. Kolodziejczak;J. Lamb;D. Landry;E. Leitch;D. Marrone;Amber D. Miller;T. Mroczkowski;S. Muchovej;T. Plagge;C. Pryke;M. Sharp;D. Woody
我们提出了Sunyaev-Zel'dovich（SZ）效应观测的样本25个大质量的松弛星系团观察与Sunyaev-Zel'dovich阵列（SZA），八元素干涉仪的一部分，组合阵列研究毫米波天文学（CARMA）。我们进行了新的SZA数据和档案钱德拉观察这个样本的分析，调查的综合压力-集群质量的代理-确定从X射线和SZ观测，两个独立的探针的集群内介质（ICM）。该分析使用Bulbul（2010 Astrophys. J. 720 1038），其可以同时应用于SZ和X射线数据。有了这个模型，我们估计的压力分布为每个集群使用的SZ和X射线数据的联合分析，并单独使用SZ数据。我们发现，从X射线和SZ数据测量的综合压力是一致的。这一结论与最近使用WMAP和普朗克数据获得的结果一致，证实了对大质量星团的SZ和X射线观测从ICM检测到相同数量的热压。为了测试我们选择的模型所引入的可能偏差，我们还使用Arnaud（2010 Astron. Astrophys. 517 A92），并发现两个模型之间的一致性，以r500的压力分布和综合压力。
We present the Sunyaev–Zel'dovich (SZ) effect observations of a sample of 25 massive relaxed galaxy clusters observed with the Sunyaev–Zel'dovich array (SZA), an eight-element interferometer that is part of the Combined Array for Research in Millimeter-wave Astronomy (CARMA). We performed an analysis of new SZA data and archival Chandra observations of this sample to investigate the integrated pressure—a proxy for cluster mass—determined from x-ray and SZ observations, two independent probes of the intra-cluster medium (ICM). This analysis makes use of a model for the ICM introduced by Bulbul (2010 Astrophys. J. 720 1038) which can be applied simultaneously to the SZ and x-ray data. With this model, we estimated the pressure profile for each cluster using a joint analysis of the SZ and x-ray data, and using the SZ data alone. We found that the integrated pressures measured from the x-ray and SZ data are consistent. This conclusion is in agreement with recent results obtained using WMAP and Planck data, confirming that SZ and x-ray observations of massive clusters detect the same amount of thermal pressure from the ICM. To test for possible biases introduced by our choice of model, we also fitted the SZ data using the universal pressure profile proposed by Arnaud (2010 Astron. Astrophys. 517 A92) and found consistency between the two models out to r500 in the pressure profiles and integrated pressures.