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arXiv 0704.2820astro-ph
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大麦云云中HI的拓扑结构

Topology of HI in the Large Magellanic Cloud

S. Kim, C. Park

摘要:

我们分析了大麦云云(LMC)的HI孔径合成图像,使用客观和定量的拓扑结构来了解HI分布托管的一些洞和各种大小的团块在介质中。HI分布在四个不同的尺度上显示出不同的拓扑结构。在探索的最小尺度(19-29 pc)下,HI质量以这样一种方式分布,即许多团块嵌入在低密度背景的顶部。在从73到194 pc的较大尺度下,它显示了一个通用的孔拓扑结构。这些黑洞可能主要是由热恒星的恒星风形成的。在240到340 pc的尺度上,略高于气体盘的盘尺度高度,HI图中的主要团块改变了分布,使其具有轻微的团块拓扑结构。这些团块包括旋臂中的巨大云协会和围绕超级黑洞的粗丝。在研究的最大尺度(390-485 pc),孔拓扑结构再次出现。对这种规模的黑洞拓扑结构负责的是一些超级黑洞,它们似乎主要与外盘的超新星爆炸有关。在此比例下,条形臂和螺旋臂之间的间隙对拓扑的影响很小。

英文摘要:

We have analyzed the HI aperture synthesis image of the Large Magellanic Cloud (LMC), using an objective and quantitative measure of topology to understand the HI distribution hosting a number of holes and clumps of various sizes in the medium. The HI distribution shows different topology at four different chosen scales. At the smallest scales explored (19-29 pc), the HI mass is distributed in such a way that numerous clumps are embedded on top of a low density background. At the larger scales from 73 to 194 pc, it shows a generic hole topology. These holes might have been formed mainly by stellar winds from hot stars. At the scales from 240 to 340 pc, slightly above the disk scale-height of the gaseous disk, major clumps in the HI map change the distribution to have a slight clump topology. These clumps include the giant cloud associations in the spiral arms and the thick filaments surrounding superholes. At the largest scales studied (390-485 pc), the hole topology is present again. Responsible to the hole topology at this scale are a few superholes which seem mainly associated with supernova explosions in the outer disk. The gaps between the bar and spiral arms have a minor effect on the topology at this scale.

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