审查反对星系中长寿命旋臂的观测证据
Reviewing the observational evidence against long-lived spiral arms in galaxies
摘要:
我们回顾了Foyle等人(2011)以前的结果,通过将傅立叶强度相位方法应用于9个星系样本。发现其中两个天体(NGC 628和NGC 5194)具有强烈的双臂图案,为长寿的螺旋提供了积极的证据。只有一个天体(NGC 3627)显示了相反的证据。通过对解析质量图的分析确定,其余物体不能包括在分析中,因为它们属于絮状和多臂类型的螺旋臂,这不是密度波理论所描述的。
英文摘要:
We review Foyle et al. (2011) previous results, by applying a Fourier intensity phases method to a nine object sample of galaxies. It was found that two of the objects (NGC 628 and NGC 5194), with strong two-arm patterns, present positive evidence for long-lived spirals. Only one of the objects (NGC 3627) shows the contrary evidence. As determined by an analysis of resolved mass maps, the rest of the objects can not be included in the analysis because they belong to flocculent and multi-arm type of spiral arms, which are not described by density wave theory.
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