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arXiv 0709.4480astro-ph
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局部星际介质IV的结构：动力学、形态学、物理性质和云-云相互作用的意义

The Structure of the Local Interstellar Medium IV: Dynamics, Morphology, Physical Properties, and Implications of Cloud-Cloud Interactions

Seth Redfield, Jeffrey L. Linsky

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65 pages, 24 figures; Accepted for publication in ApJ
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摘要：

我们提出了一个经验动力学模型的本地星际介质的基础上270径向速度测量157视线对附近的恒星。物理参数测量（即，温度、湍流速度、损耗）可用于90种成分，或三分之一的样品，从而能够对LISM云的物理特性进行初步表征。该模型包括15个位于太阳15 pc范围内的暖云，每个云具有不同的速度矢量。我们推导出所有云的投影形态，并估计LISM中温暖的部分电离物质的体积填充因子在~5.5%和19%之间。潜在相互作用云的相对速度通常是超音速的，与加热，湍流和金属耗尽特性相一致。云与云的碰撞可能是造成约1/3 LISM云的结构形态、云沿两个最近云（LIC和G）边界的分布、Mic云的详细形状和加热、附近无线电闪烁屏的位置以及LISM冷云的位置的原因。与先前的说法相反，太阳似乎位于LIC和G云之间的过渡区。

英文摘要：

We present an empirical dynamical model of the local interstellar medium based on 270 radial-velocity measurements for 157 sight lines toward nearby stars. Physical-parameter measurements (i.e., temperature, turbulent velocity, depletions) are available for 90 components, or one-third of the sample, enabling initial characterizations of the physical properties of LISM clouds. The model includes 15 warm clouds located within 15 pc of the Sun, each with a different velocity vector. We derive projected morphologies of all clouds and estimate the volume filling factor of warm partially ionized material in the LISM to be between ~5.5% and 19%. Relative velocities of potentially interacting clouds are often supersonic, consistent with heating, turbulent, and metal-depletion properties. Cloud-cloud collisions may be responsible for the filamentary morphologies found in ~1/3 of LISM clouds, the distribution of clouds along the boundaries of the two nearest clouds (LIC and G), the detailed shape and heating of the Mic Cloud, the location of nearby radio scintillation screens, and the location of a LISM cold cloud. Contrary to previous claims, the Sun appears to be located in the transition zone between the LIC and G Clouds.

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