NE2001. II. Using Radio Propagation Data to Construct a Model for the Galactic Distribution of Free Electrons
NE2001. II. Using Radio Propagation Data to Construct a Model for the Galactic Distribution of Free Electrons
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发表时间：
2003-01
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通讯作者：
J. Cordes;T. Lazio
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作者：
J. Cordes;T. Lazio
在论文1中，我们提出了一个新的自由电子的银河系分布模型。在本文中，我们描述了用于确定模型结构和参数的输入数据和方法。提供了输入数据的表格，并使用了几个图表来说明为什么需要特定的星系结构。我们确定视线上的离散区域增强或减弱色散或散射。大多数不符合已知的\离子{H}{2}区域或超壳层，很可能是因为增强对应的柱密度小于重组线调查中发射测量的检测阈值。
In Paper I we present a new model for the Galactic distribution of free electrons. In this paper we describe the input data and methodology for determining the structure and parameters of the model. Tables of the input data are provided and several figures are used to demonstrate why particular Galactic structures are needed. We identify lines of sight on which discrete regions either enhance or diminish the dispersion or the scattering. Most do not coincide with known \ion{H}{2} regions or supershells, most likely because the enhancements correspond to column densities smaller than detection thresholds for the emission measure in recombination-line surveys.