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arXiv 0907.1287astro-ph.CO
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非平衡电子与星系团的Sunyaev-Zel'dovich效应

Non-Equilibrium Electrons and the Sunyaev-Zel'dovich Effect of Galaxy Clusters

Douglas H. Rudd, Daisuke Nagai

摘要:

我们提出了高分辨率的宇宙学流体动力学模拟的三个星系团采用双温度模型的团内介质。我们发现,在集群外围的电子温度显着低于平均气体温度,因为库仑碰撞是不足以保持电子和离子的热平衡。这种偏差在更大规模和更不宽松的系统中更大,范围从宽松集群的5%到正在进行重大合并的集群的30%。非平衡电子的存在导致显着抑制的SZE信号在大集群中心半径。电子压力的抑制也导致了流体静力质量的低估。合并驱动,内部冲击也可能产生显着的人口的非平衡电子在集群核心,导致5%的偏见,在集群合并的综合SZ质量代理。

英文摘要:

We present high-resolution cosmological hydrodynamic simulations of three galaxy clusters employing a two-temperature model for the intracluster medium. We show that electron temperatures in cluster outskirts are significantly lower than the mean gas temperature, because Coulomb collisions are insufficient to keep electrons and ions in thermal equilibrium. This deviation is larger in more massive and less relaxed systems, ranging from 5% in relaxed clusters to 30% for clusters undergoing major mergers. The presence of non-equilibrium electrons leads to significant suppression of the SZE signal at large cluster-centric radius. The suppression of the electron pressure also leads to an underestimate of the hydrostatic mass. Merger-driven, internal shocks may also generate significant populations of non-equilibrium electrons in the cluster core, leading to a 5% bias on the integrated SZ mass proxy during cluster mergers.

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