Mass–density relationship in molecular cloud clumps
Mass–density relationship in molecular cloud clumps
复制标题
分子云团中的质量密度关系
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
R. Klessen
中科院分区：
文献类型：
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作者：
S. Donkov;T. Veltchev;R. Klessen
我们研究了分子云凝聚（团块）的质量密度关系，考虑到它们的引力，动能，内能和磁能之间的各种均分关系。团被描述为统计，密度分布，反映了一个对数正态概率密度函数在湍流冷星际介质。在不同尺度L下得到的团块质量密度指数x在大多数情况下在−2.5 <$x <$−0.2范围内变化，具有明显的尺度依赖性，与观测结果一致。当从所有尺度下生成的团簇的整体尺寸-质量关系导出时，团簇质量密度指数的典型值为−3.0 <$x（γglob）<$−0.3，这取决于能量的形式，包括在均分关系中，以及速度标度定律，而当考虑磁能时，团簇几何的描述是重要的。
We study the mass–density relationship n ∝ mx in molecular cloud condensations (clumps), considering various equipartition relations between their gravitational, kinetic, internal and magnetic energies. Clumps are described statistically, with a density distribution that reflects a lognormal probability density function in turbulent cold interstellar medium. The clump mass–density exponent x derived at different scales L varies in most of the cases within the range −2.5 ≲x≲−0.2, with a pronounced scale dependence and in consistency with observations. When derived from the global size–mass relationship for set of clumps, generated at all scales, the clump mass–density exponent has typical values −3.0 ≲x(γglob) ≲−0.3 that depend on the forms of energy, included in the equipartition relations, and on the velocity scaling law, whereas the description of clump geometry is important when magnetic energy is taken into account.