Topology of Neutral Hydrogen within the Small Magellanic Cloud
Topology of Neutral Hydrogen within the Small Magellanic Cloud
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DOI：
10.1086/591655
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发表时间：
2007-11
期刊：
影响因子：
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通讯作者：
A. Chepurnov;J. Gordon;J. Gordon;A. Lazarian;S. Stanimirović
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文献类型：
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作者：
A. Chepurnov;J. Gordon;J. Gordon;A. Lazarian;S. Stanimirović
在本文中，属统计已应用于小麦哲伦星云的 H I 柱密度图，以研究其拓扑结构。为了了解拓扑如何随着系统规模的变化而变化，我们提供了不同分辨率下的列密度图的拓扑研究。为了评估亏格的统计误差，我们在保持幅度的同时随机重新分配傅里叶模式的相位。我们发现，在研究的最小尺度（40 pc ⩽ λ ⩽ 80 pc）下，所有区域的属移都是负的，这意味着丛拓扑。在较大尺度（110 pc ⩽ λ ⩽ 250 pc）下，拓扑变化在四种情况下检测为负（“肉丸”拓扑），在两种情况下检测为正（“瑞士奶酪”拓扑）。在四个区域中，没有出现统计上显着的大规模拓扑变化。
In this paper, genus statistics have been applied to an H I column density map of the Small Magellanic Cloud in order to study its topology. To learn how topology changes with the scale of the system, we provide topology studies for column density maps at varying resolutions. To evaluate the statistical error of the genus, we randomly reassign the phases of the Fourier modes while keeping the amplitudes. We find that at the smallest scales studied (40 pc ⩽ λ ⩽ 80 pc), the genus shift is negative in all regions, implying a clump topology. At the larger scales (110 pc ⩽ λ ⩽ 250 pc), the topology shift is detected to be negative (a “meatball” topology) in four cases and positive (a “swiss cheese” topology) in two cases. In four regions, there is no statistically significant topology shift at large scales.