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arXiv 0712.2453astro-ph
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星系团和星系群的Sunyaev-Zeldovich轮廓

Sunyaev-Zeldovich profiles for clusters and groups of galaxies

Troels Haugboelle, Jesper Sommer-Larsen, Kristian Pedersen

摘要:

Sunyaev-Zeldovich(SZ)效应给出了星系群和星系团中的热能和电子压力的量度。在不久的将来,SZ调查将绘制数百个系统,揭示系统中的压力分布。热能与星系系统的总质量有关,但它只是通过SZ效应观察到的投影。需要一个三维压力分布模型,将SZ信号与系统的总质量联系起来。在这项工作中,我们构建了一个经验模型的2D和3D SZ配置文件,并比较它的一组现实的高分辨率SPH模拟的星系团和团体,并堆叠SZ配置文件的大规模集群来自WMAP数据。此外,我们结合观测到的温度分布与暗物质潜力,产生一个额外的约束,假设流体静力平衡。我们发现模型中的特征尺度、集成SZ信号和系统中的总质量之间存在非常紧密的相关性,散射仅为4%。该模型只包含两个自由参数,使得它很容易适用于低分辨率的星系团SZ观测。可以在http://www.phys.au.dk/~haugboel/software.shtml上找到可应用于观测或模拟数据的模型拟合例程

英文摘要:

The Sunyaev-Zeldovich (SZ) effect gives a measure of the thermal energy and electron pressure in groups and clusters of galaxies. In the near future SZ surveys will map hundreds of systems, shedding light on the pressure distribution in the systems. The thermal energy is related to the total mass of a system of galaxies, but it is only a projection that is observed through the SZ effect. A model for the 3D distribution of pressure is needed to link the SZ signal to the total mass of the system. In this work we construct an empirical model for the 2D and 3D SZ profile, and compare it to a set of realistic high resolution SPH simulations of galaxy clusters and groups, and to a stacked SZ profile for massive clusters derived from WMAP data. Furthermore, we combine observed temperature profiles with dark matter potentials to yield an additional constraint, under the assumption of hydrostatic equilibrium. We find a very tight correlation between the characteristic scale in the model, the integrated SZ signal, and the total mass in the systems with a scatter of only 4%. The model only contains two free parameters, making it readily applicable even to low resolution SZ observations of galaxy clusters. A fitting routine for the model that can be applied to observed or simulated data can be found at http://www.phys.au.dk/~haugboel/software.shtml

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