The dependence of star formation on initial conditions and molecular cloud structure

The dependence of star formation on initial conditions and molecular cloud structure
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恒星形成对初始条件和分子云结构的依赖性

DOI:
10.1111/j.1365-2966.2009.14970.x
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发表时间:
2009
影响因子:
4.8
通讯作者:
Bate M
Bate M
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Bate M

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我们研究恒星形成分子云中气体的初始运动学结构对恒星性质的依赖性。我们比较了两个大规模的流体动力学模拟的星星集群的形成,解决了破碎过程的不透明度限制,其中第一个是由Bate,Bonnell和Bromm报告的结果。两种计算的初始条件是相同的,但在新的模拟中,最初施加在云上并允许衰减的速度场的功率谱偏向于大尺度运动。Bate等人的计算是从功率谱P(k)<$k− 4开始的,以匹配分子云中观测到的湍流运动的Larson标度关系,而新的计算是从功率谱P(k)<$k− 6开始的。这表明这种星星团形成的流体动力学计算结果对初始条件相对不敏感。这也与恒星和褐矮星的统计特性(例如恒星初始质量函数)在我们的银河系中相对不变,似乎不依赖于环境的事实相一致。
We investigate the dependence of stellar properties on the initial kinematic structure of the gas in star-forming molecular clouds. We compare the results from two large-scale hydrodynamical simulations of star cluster formation that resolve the fragmentation process down to the opacity limit, the first of which was reported by Bate, Bonnell & Bromm. The initial conditions of the two calculations are identical, but in the new simulation the power spectrum of the velocity field imposed on the cloud initially and allowed to decay is biased in favour of large-scale motions. Whereas the calculation of Bate et al. began with a power spectrumP(k) ∝k−4to match the Larson scaling relations for the turbulent motions observed in molecular clouds, the new calculation begins with a power spectrumP(k) ∝k−6.Despite this change to the initial motions in the cloud and the resulting density structure of the molecular cloud, the stellar properties resulting from the two calculations are indistinguishable. This demonstrates that the results of such hydrodynamical calculations of star cluster formation are relatively insensitive to the initial conditions. It is also consistent with the fact that the statistical properties of stars and brown dwarfs (e.g. the stellar initial mass function) are observed to be relatively invariant within our Galaxy and do not appear to depend on environment.
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发表时间: 2003
影响因子: 4.8
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