Three Hundred计划：通过Zernike多项式探索星系团的形态和动力学状态
The Three Hundred Project: quest of clusters of galaxies morphology and dynamical state through Zernike Polynomials
摘要：
在将来自这些天体的观测数据应用于宇宙学研究时，对星系团动态的了解有助于减轻系统学的负担。的状态和簇的形态之间的相关性的证据进行了很好的研究。其形态可以通过X射线波段的表面亮度图像和毫米级Sunyaev-Zel'dovich（tSZ）效应的热分量图像来推断。为了这个目的，我们申请，第一次，泽尔尼克多项式分解，一个常见的分析方法，主要用于自适应光学恢复像差辐射波前在望远镜的光瞳平面。用这种新的方法，我们希望正确地推断团簇的形态，因此可能，他们的动力学状态。为了验证这种新方法的可靠性，我们使用了300多个在THE THREE HUNDRED项目中选择的不同红移范围从0到1.03的合成团簇。模拟地图的tSZ，量化的康普顿参数，$y$ -地图，建模与泽尔尼克多项式内$R_{500}$，集群参考半径。我们验证，它是可能的，以区分每个集群的形态，通过估计不同的多项式的贡献，适合的地图。这种新方法的结果与以前的分析在同一目录，使用两个参数，结合形态或动态探针。我们强调，仪器的角分辨率的地图有影响，主要是当我们将这种方法扩展到高红移集群。
英文摘要：
The knowledge of the dynamical state of galaxy clusters allows to alleviate systematics when observational data from these objects are applied in cosmological studies. Evidence of correlation between the state and the morphology of the clusters is well studied. The morphology can be inferred by images of the surface brightness in the X-ray band and of the thermal component of the Sunyaev-Zel'dovich (tSZ) effect in the millimetre range. For this purpose, we apply, for the first time, the Zernike polynomial decomposition, a common analytic approach mostly used in adaptive optics to recover aberrated radiation wavefronts at the telescopes pupil plane. With this novel way we expect to correctly infer the morphology of clusters and so possibly, their dynamical state. To verify the reliability of this new approach we use more than 300 synthetic clusters selected in THE THREE HUNDRED project at different redshifts ranging from 0 up to 1.03. Mock maps of the tSZ, quantified with the Compton parameter, $y$-maps, are modelled with Zernike polynomials inside $R_{500}$, the cluster reference radius. We verify that it is possible to discriminate the morphology of each cluster by estimating the contribution of the different polynomials to the fit of the map. The results of this new method are correlated with those of a previous analysis made on the same catalogue, using two parameters that combine either morphological or dynamical-state probes. We underline that instrumental angular resolution of the maps has an impact mainly when we extend this approach to high-redshift clusters.
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