Cold stream stability during minor mergers

Cold stream stability during minor mergers
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小型合并期间的冷流稳定性

DOI:
10.1093/mnrasl/slu005
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发表时间:
2014-01
影响因子:
4.8
通讯作者:
Xi, Kang
Xi, Kang
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Longlong, Feng;Andrea V. Maccio;Jiang , Chang;Xi, Kang

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我们使用高分辨率的欧拉模拟来研究红移z = 2的星系大小的暗物质晕(10(12)M圆点)中冷气体流的稳定性。我们的模拟表明,冷流穿透热气体晕是稳定的热对流和开尔文-亥姆霍兹不稳定性。然后,我们调查的影响,卫星轨道的主要晕在平面上的流。该卫星能够扰动气流,并在0.5 Gyr内抑制冷气体向晕中心吸积。然而,如果在大距离处冷气体的供应保持恒定,冷流能够在0.3 Gyr之后重新建立。我们的结论是,冷流是非常稳定的,对各种各样的内部和外部扰动。
We use high-resolution Eulerian simulations to study the stability of cold gas flows in a galaxy size dark matter halo (10(12) M-circle dot) at redshift z = 2. Our simulations show that a cold stream penetrating a hot gaseous halo is stable against thermal convection and Kelvin-Helmholtz instability. We then investigate the effect of a satellite orbiting the main halo in the plane of the stream. The satellite is able to perturb the stream and to inhibit cold gas accretion towards the centre of the halo for 0.5 Gyr. However, if the supply of cold gas at large distances is kept constant, the cold stream is able to re-establish itself after 0.3 Gyr. We conclude that cold streams are very stable against a large variety of internal and external perturbations.
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