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
中科院分区:
文献类型:
--
作者:
Roediger;Lovisari;Ghizzardi;Brüggen;Machacek
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.
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J. Bregman
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E. Tittley;M. Henriksen
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--
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10.1086/337973
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