“盘状星系”是天文学专有名词。来自中国天文学名词审定委员会审定发布的天文学专有名词中文译名，词条译名和中英文解释数据版权由天文学名词委所有。
本文从密度波理论出发，讨论三维盘状星系的旋臂结构。
In this paper we discuss the spiral structure of dish galaxies in three-dimension according to the density wave theory.
目前的星系形成理论认为，盘状星系由暗晕中的重子物质冷却并坍缩而成。
In the current paradigm of galaxy formation, disk galaxies are assumed to form by the cooling and condensation of baryons within dark matter halos.
同时，从三维盘状星系密度波的稳定性讨论推出了径向速度弥散度的变化规律。
We also obtain the variation of the radial dispersion of velocities with r through the stability of the density wave in three-dimensional dishlike galaxies.
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