Cluster Sunyaev-Zeldovich Effect Scaling Relations
Cluster Sunyaev-Zeldovich Effect Scaling Relations
复制标题
簇 Sunyaev-Zeldovich 效应尺度关系
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
M. Balogh
中科院分区：
文献类型：
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作者：
I. McCarthy;A. Babul;G. Holder;M. Balogh
在附近星系群和星系团中的“熵底”的X射线观测提供了证据，证明重要的非引力过程，如辐射冷却和/或“预热”，强烈影响了星系团内介质（ICM）的演化。我们研究如何存在的熵地板修改的热Sunyaev-Zeldovich（SZ）的效果。详细分析了X射线和SZ效应观测量之间以及两个主要SZ效应观测量之间的标度关系。我们发现，中央康普顿参数和温度或质量的集群之间的关系是非常敏感的熵地板的存在。积分康普顿参数与X射线光度或中心康普顿参数之间的相关性也是如此。事实上，如果熵底像最近的X射线数据分析中推断的那样高，那么将这些相关性与当前和未来的SZ效应观测进行比较，应该会显示出这种过剩熵的明显特征。此外，由于SZ效应是红移独立的，关系可以潜在地用于跟踪团簇气体的演化，并可能区分可能的来源之间的过剩熵。为了便于与观测结果的比较，我们提供了这些尺度关系的解析拟合。
X-ray observations of an "entropy floor" in nearby groups and clusters of galaxies offer evidence that important nongravitational processes, such as radiative cooling and/or "preheating," have strongly influenced the evolution of the intracluster medium (ICM). We examine how the presence of an entropy floor modifies the thermal Sunyaev-Zeldovich (SZ) effect. A detailed analysis of scaling relations between X-ray and SZ effect observables and also between the two primary SZ effect observables is presented. We find that relationships between the central Compton parameter and the temperature or mass of a cluster are extremely sensitive to the presence of an entropy floor. The same is true for correlations between the integrated Compton parameter and the X-ray luminosity or the central Compton parameter. In fact, if the entropy floor is as high as inferred in recent analyses of X-ray data, a comparison of these correlations with both current and future SZ effect observations should show a clear signature of this excess entropy. Moreover, because the SZ effect is redshift independent, the relations can potentially be used to track the evolution of the cluster gas and possibly discriminate between the possible sources of the excess entropy. To facilitate comparisons with observations, we provide analytic fits to these scaling relations.