arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0812.2959astro-ph
收藏

图案速度和星系形态

Pattern Speeds and Galaxy Morphology

R. Buta, X. Zhang

摘要:

盘状星系的形态与其运动状态密切相关。这是因为密度波的特征很可能是由自发形成的模式组成的,这些模式被允许在特定基本盘态的银河共振腔中出现。密度波的模式速度是表征波及其相关共振的重要参数。不同作者的数值模拟使我们能够解释一些星系的高或低的模式速度。势密度相移法是利用星系形态学确定星系运动学性质的一种有效的新方法。这种关联背后的动力学机制也是星系长期演化的原因。我们描述了最近的结果,从应用这种新方法超过150个星系在俄亥俄州立大学明亮的星系调查和其他数据集。

英文摘要:

The morphology of a disk galaxy is closely linked to its kinematic state. This is because density wave features are likely made of spontaneously-formed modes which are allowed to arise in the galactic resonant cavity of a particular basic disk state. The pattern speed of a density wave is an important parameter that characterizes the wave and its associated resonances. Numerical simulations by various authors have enabled us to interpret some galaxies in terms of high or low pattern speeds. The potential-density phase-shift method for locating corotation radii is an effective new tool for utilizing galaxy morphology to determine the kinematic properties of galaxies. The dynamical mechanism underlying this association is also responsible for the secular evolution of galaxies. We describe recent results from the application of this new method to more than 150 galaxies in the Ohio State University Bright Galaxy Survey and other datasets.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑