Statistical link between the structure of molecular clouds and their density distribution

Statistical link between the structure of molecular clouds and their density distribution
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分子云结构与其密度分布之间的统计联系

DOI:
10.1093/mnras/stw3147
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发表时间:
2017
影响因子:
4.8
通讯作者:
Klessen
Klessen
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Donkov;Veltchev;Klessen

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我们介绍的概念,一类等价的分子云表示一个抽象的球对称,各向同性的对象。该目的是通过使用相对于给定的质量密度分布的抽象尺度来描述的。质量和平均密度被归因于每个尺度,因此与密度分布相关联:幂律类型和任意连续类型。在后一种情况下,我们推导出在给定尺度下的平均密度和定义质量密度关系的结构参数之间的微分关系。云的二维(2D)投影沿着视线也进行了研究。在幂律分布和任意连续分布的情况下,导出了质量和平均密度的标度关系。我们得到的标度指数之间的关系,在2D和3D的情况下。建议类的等价物是代表的一般结构的真实的云与各种类型的列密度分布:幂律,对数正态或两者的组合。
We introduce the concept of a class of equivalence of molecular clouds represented by an abstract spherically symmetric, isotropic object. This object is described by use of abstract scales in respect to a given mass-density distribution. Mass and average density are ascribed to each scale and thus are linked to the density distribution: a power-law type and an arbitrary continuous one. In the latter case, we derive a differential relationship between the mean density at a given scale and the structure parameter that defines the mass-density relationship. The two-dimensional (2D) projection of the cloud along the line of sight is also investigated. Scaling relations of mass and mean density are derived in the considered cases of power-law and arbitrary continuous distributions. We obtain relations between scaling exponents in the 2D and 3D cases. The proposed classes of equivalence are representative for the general structure of real clouds with various types of column-density distributions: power law, lognormal or combination of both.
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