Gas sloshing, cold fronts, Kelvin–Helmholtz instabilities and the merger history of the cluster of galaxies Abell 496

Gas sloshing, cold fronts, Kelvin–Helmholtz instabilities and the merger history of the cluster of galaxies Abell 496
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气体晃动、冷锋、开尔文·亥姆霍兹不稳定性和 Abell 496 星系团的合并历史

DOI:
10.1111/j.1365-2966.2011.20287.x
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发表时间:
2012
影响因子:
4.8
通讯作者:
Machacek
Machacek
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Roediger;Lovisari;Ghizzardi;Brüggen;Machacek

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我们通过直接比较观测结果和专门的流体动力学模拟,研究了 Abell 496 核心的多个晃动冷锋的起源和性质。我们的模拟模拟了大约 0.6-0.8 Gyr 之前,4 × 1013M⊙子星团从西南向北东北东穿过 A496 的一次小合并,并以 100 至几个 × 100 kpc 的近心距离穿过东南部的星团核心。合并引发的气体晃动可以重现几乎所有观察到的特征,例如星团中心的特征性螺旋状亮度残差分布及其高达 500 kpc 的不对称性,以及冷锋的位置和对比度。如果子星团经过靠近(100 kpc)的星团核心,产生的剪切流足够强大,足以触发开尔文-亥姆霍兹不稳定性,在投影中类似于阿贝尔 496 冷锋中的特殊扭结。最后,我们表明,晃动不会导致全局星团内介质剖面的显着改变,而是导致围绕初始剖面的轻微振荡。
We investigate the origin and nature of the multiple sloshing cold fronts in the core of Abell 496 by direct comparison between observations and dedicated hydrodynamical simulations. Our simulations model a minor merger with a 4 × 1013M⊙subcluster crossing A496 from the south-west to the north–north-east, passing the cluster core in the south-east at a pericentre distance of 100 to a few × 100 kpc about 0.6–0.8 Gyr ago. The gas sloshing triggered by the merger can reproduce almost all observed features, e.g. the characteristic spiral-like brightness residual distribution in the cluster centre and its asymmetry out to 500 kpc, also the positions of and contrasts across the cold fronts. If the subcluster passes close (100 kpc) to the cluster core, the resulting shear flows are strong enough to trigger Kelvin–Helmholtz instabilities that in projection resemble the peculiar kinks in the cold fronts of Abell 496. Finally, we show that sloshing does not lead to a significant modification of the global intracluster medium profiles but a mild oscillation around the initial profiles.
在非合并星团中形成冷锋的不同方法
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