A Sunyaev–Zel’dovich take on cluster radio haloes – I. Global scaling and bi‐modality using Planck data
A Sunyaev–Zel’dovich take on cluster radio haloes – I. Global scaling and bi‐modality using Planck data
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DOI：
10.1111/j.1745-3933.2012.01217.x
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发表时间：
2011-11
影响因子：
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通讯作者：
K. Basu
中科院分区：
文献类型：
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作者：
K. Basu
星系团中的巨型射电晕是Mpc尺度上相对论粒子（宇宙线）和磁场存在的主要证据。到目前为止，解释其动力机制的不同理论模型的观测测试已经通过X射线选择的集群，例如通过比较集群X射线光度与无线电晕功率。在这里，我们提出了第一个全球性的无线电晕功率和综合Sunyaev-Zel'dovich（SZ）效应测量之间的比例关系，使用普朗克全天星团目录和已公布的无线电数据。相关性同意与以前的缩放测量的基础上X射线数据，并提供了一个更直接的探讨无线电晕内的质量依赖。然而，我们没有发现强烈的迹象表明，一个双峰集群人口之间的无线电晕和无线电安静的对象分裂。我们讨论了这种明显缺乏双模态的可能原因，并比较了观测到的无线电SZ相关性与无线电晕起源的竞争理论模型的斜率。
Giant radio haloes in galaxy clusters are the primary evidence for the existence of relativistic particles (cosmic rays) and magnetic fields over Mpc scales. Observational tests for the different theoretical models explaining their powering mechanism have so far been obtained through X-ray selection of clusters, e.g. by comparing cluster X-ray luminosities with radio halo power. Here we present the first global scaling relations between radio halo power and integrated Sunyaev–Zel’dovich (SZ) effect measurements, using the Planck all-sky cluster catalogue and published radio data. The correlation agrees well with previous scaling measurements based on X-ray data and offers a more direct probe into the mass dependence inside radio haloes. However, we find no strong indication for a bi-modal cluster population split between radio halo and radio-quiet objects. We discuss the possible causes for this apparent lack of bi-modality and compare the observed slope of the radio–SZ correlation with competing theoretical models of radio halo origin.