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arXiv 1708.03325astro-ph.COastro-ph.GA
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MUSIC星系团Sunyaev-Zel 'dovich映射的形态学估计

Morphological estimators on Sunyaev--Zel'dovich maps of MUSIC clusters of galaxies

Giammarco Cialone, Marco De Petris, Federico Sembolini, Gustavo Yepes, Anna Silvia Baldi, Elena Rasia

备注：
Updated to match the MNRAS published version. 15 pages, 9 figures, 9 tables
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摘要：

星系团形态的确定对星系团的宇宙学和天体物理学研究具有重要意义。在本文中，我们解决的形态特征的合成地图的Sunyaev-Zel'dovich（SZ）的影响产生的样本258个大规模的集群（$M_{vir}>5\times10^{14}h^{-1}$ M $_\odot$在$z=0$），提取的MUSIC流体动力学模拟。具体来说，我们应用五个已知的形态学参数，已经在X射线，两个新引入的，我们将它们结合在一起，在一个单一的参数。我们分析了两组模拟得到的不同处方的气体物理（非辐射和冷却，恒星形成和恒星反馈）在四个红移0.43和0.82之间。对于每个参数，我们测试其稳定性和效率，以区分真正的集群动力学状态，测量的理论指标。组合参数更有效地区分放松和干扰的集群。该参数与流体静力学质量（$\sim 0.3$）有轻度相关性，与SZ质心和群集质心之间的偏移量（$\sim 0.8$）有较强相关性。后者的数量结果作为SZ研究的动态状态的最容易和有效的指标。

英文摘要：

The determination of the morphology of galaxy clusters has important repercussion on their cosmological and astrophysical studies. In this paper we address the morphological characterisation of synthetic maps of the Sunyaev--Zel'dovich (SZ) effect produced for a sample of 258 massive clusters ($M_{vir}>5\times10^{14}h^{-1}$M$_\odot$ at $z=0$), extracted from the MUSIC hydrodynamical simulations. Specifically, we apply five known morphological parameters, already used in X-ray, two newly introduced ones, and we combine them together in a single parameter. We analyse two sets of simulations obtained with different prescriptions of the gas physics (non radiative and with cooling, star formation and stellar feedback) at four redshifts between 0.43 and 0.82. For each parameter we test its stability and efficiency to discriminate the true cluster dynamical state, measured by theoretical indicators. The combined parameter discriminates more efficiently relaxed and disturbed clusters. This parameter had a mild correlation with the hydrostatic mass ($\sim 0.3$) and a strong correlation ($\sim 0.8$) with the offset between the SZ centroid and the cluster centre of mass. The latter quantity results as the most accessible and efficient indicator of the dynamical state for SZ studies.

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