3D AMR hydrosimulations of a compact-source scenario for the Galactic Centre cloud G2

3D AMR hydrosimulations of a compact-source scenario for the Galactic Centre cloud G2
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银河中心云 G2 的紧凑源场景的 3D AMR 水文模拟

DOI:
10.1093/mnras/sty1408
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发表时间:
2018
影响因子:
4.8
通讯作者:
George
George
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Ballone;Schartmann;Burkert;Gillessen;Genzel;Eisenhauer;Habibi;George

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银河系中心气态尘埃云 G2 的性质仍然存在争议。我们提出了 G2 的三维流体动力学自适应网格细化模拟,将其建模为在观测轨道上移动的“紧凑源”的流出。模拟位置速度(PV)图的构建可以与观测结果进行直接比较,并让我们得出结论,G2 气体成分的观测特性可以与大量()和缓慢(50 km s−1)的流出相匹配,如金牛座 T 星所观察到的那样。为了实现这一点,只有距源较远(>100 AU)的材料才必须真正发射;否则,与观察到的 PV 图相比,G2 会显得过于紧凑。另一方面,中央尘埃源的存在或许能够解释 G2 尘埃成分的致密性。在目前的情况下,在近心5-10年后,致密源应该与先前喷射的物质脱钩,因为后者与周围炎热而稠密的大气之间的流体动力相互作用。在这种情况下,新的资金流出应该在前一个资金流出之前形成,这将是资金流出情景的确凿证据。
The nature of the gaseous and dusty cloud G2 in the Galactic Centre is still under debate. We present three-dimensional hydrodynamical adaptive mesh refinement simulations of G2, modelled as an outflow from a ‘compact source’ moving on the observed orbit. The construction of mock position-velocity (PV) diagrams enables a direct comparison with observations and allows us to conclude that the observational properties of the gaseous component of G2 could be matched by a massive () and slow (50 km s−1) outflow, as observed for T Tauri stars. In order for this to be true, only the material at larger (>100 AU) distances from the source must be actually emitting; otherwise G2 would appear too compact compared to the observed PV diagrams. On the other hand, the presence of a central dusty source might be able to explain the compactness of G2’s dust component. In the present scenario, 5–10 years after pericentre the compact source should decouple from the previously ejected material, due to the hydrodynamic interaction of the latter with the surrounding hot and dense atmosphere. In this case, a new outflow should form, ahead of the previous one, which would be the smoking gun evidence for an outflow scenario.
通过 X 射线揭示 DG Tauri 流出速度最快的部分
DOI: --
发表时间: 2008
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发表时间: 1984
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发表时间: 2013
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影响因子: --
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