Velocity and Density Spectra of the Small Magellanic Cloud
Velocity and Density Spectra of the Small Magellanic Cloud
复制标题
小麦哲伦星云的速度和密度谱
DOI：
10.1086/319837
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
A. Lazarian
中科院分区：
文献类型：
--
作者：
S. Stanimirović;A. Lazarian
这封信报告了小麦哲伦云（SMC）中H I湍流的统计分析结果。我们使用21厘米的通道地图，获得与澳大利亚望远镜紧凑阵列和帕克斯望远镜，并分析所观察到的强度波动作为速度切片厚度的函数的频谱。我们证实了最近的预测Lazarian和Pogosyan的幂律指数的变化，并建立了三维密度和速度的频谱。得到的谱指数，-3.3和-3.4，比柯尔莫哥洛夫谱的预测略浅。这与激波型谱的预测形成对比，激波型谱比Kolmogorov谱更陡。SMC中能量注入的性质尚不清楚，因为在SMC的整个尺度上没有观察到明显的能量注入尺度。
This Letter reports results on the statistical analysis of H I turbulence in the Small Magellanic Cloud (SMC). We use 21 cm channel maps, obtained with the Australia Telescope Compact Array and the Parkes telescope, and analyze the spectrum of observed intensity fluctuations as a function of the velocity slice thickness. We confirm recent predictions by Lazarian & Pogosyan on the change of the power-law index and establish the spectra of three-dimensional density and velocity. The obtained spectral indices, -3.3 and -3.4, are slightly more shallow than the predictions for the Kolmogorov spectrum. This contrasts with the predictions for the shock-type spectra that are steeper than the Kolmogorov one. The nature of the energy injection in the SMC is unclear, as no distinct energy injection scales are observed up to the entire scale of the SMC.