Analogues of Cores and Stars in Simulated Molecular Clouds
Analogues of Cores and Stars in Simulated Molecular Clouds
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模拟分子云中核心和恒星的类似物
DOI：
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发表时间：
2010
期刊：
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通讯作者：
Nicholas Petitclerc
中科院分区：
文献类型：
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作者：
J. Wadsley;Michael J. Reid;Farid Qamar;A. Sills;Nicholas Petitclerc
摘要我们使用来自塌缩，湍流分子云模拟没有水槽的图像，探讨有限的图像角分辨率和噪声的影响，导出的团块质量函数。这些影响随机扰动的团块质量，产生一个对数正态团块质量函数与萨尔佩特一样的高质量端。我们表明，特征打破质量的模拟团块质量函数的变化与角分辨率的图像的方式是完全一致的观察。我们还提出了一些关于水槽粒子的警示故事，并强调需要确保水槽实际上对应于不同的塌缩对象。我们测试了几个流行的数值水槽标准在文献中，并比较收敛，非水槽的结果。
Abstract We use images derived from collapsing, turbulent molecular cloud simulations without sinks to explore the effects of finite image angular resolution and noise on the derived clump mass function. These effects randomly perturb the clump masses, producing a lognormal clump mass function with a Salpeter-like high mass end. We show that the characteristic break mass of the simulated clump mass functions changes with the angular resolution of the images in a way that is entirely consistent with the observations. We also present some cautionary tales regarding sink particles and highlight the need to ensure that sinks actually correspond to distinct collapsing objects. We test several popular numerical sink criteria in the literature and compare to converged, non-sink results.