A power spectrum analysis of the angular scale of Galactic neutral hydrogen emission towards l=140°, b=0°
A power spectrum analysis of the angular scale of Galactic neutral hydrogen emission towards l=140°, b=0°
复制标题
银河系中性氢发射向 l=140°、b=0° 角尺度的功率谱分析
DOI：
10.1093/mnras/262.2.327
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发表时间：
1993
影响因子：
4.8
通讯作者：
D. Green
中科院分区：
文献类型：
--
作者：
D. Green
角功率谱来自DRAO银道面巡天的H I辐射，相对于当地静止标准，速度在100和100 - 95 km s-1之间。英仙座旋臂最亮的辐射角标度范围从0.1 °到0.1 °。一般来说，光谱在紫外平面上与半径的幂律关系很好地拟合，指数在0.22到0.30之间。与大的物理尺度相对应的较远的H I往往比较近的H I具有更负的指数。在任何速度下都没有明显的优选角标度。这些结果提供了外星系H I的简明统计描述
Angular power spectra are derived from the DRAO Galactic Plane Survey for H I emission with velocities between ≃ 0 and ≃ − 95 km s −1 with respect to the Local Standard of Rest. The angular scales range from ≃ 1° to ≃ 0°.1 for the brightest emission in the Perseus arm. Generally the spectra are well fitted by a power-law dependence on radius in the uv-plane, with an index between ≃ − 2.2 and ≃ − 3.0. The more distant H I, which corresponds to large physical scales, tends to have a more negative index than the nearer H I. There is no preferred angular scale apparent at any velocity. These results provide a concise statistical description of H I in the outer Galaxy