摘要
本文从星系动力学方程组出发,以星(系)盘的Poisson方程为基本方程,由Bessel-Fo-urier变换导出决定星盘外部物质投影面密度σ(r)的基本方程.对于星系外部平直旋转曲线情形,寻求了σ(r)和恒星速度弥散度随γ的指数分布解,并求出了它们的指数衰减系数(或特征尺度)与星系厚度间的一个重要关系式。
A basic differential equation govering the projected surface densky distribution in the outer region of disk of three dimensional disk galaxies is derived by Bessel-Fourier transform from the fundamental equations of galactic dynamics and Poisson equation.A solution,in which both surface density and velocity dispersion components of stars exponentially vary with r in the outer region of disk,where the rotation curve is flat,is found.A relation between the characteristic lenth of surface density and the thickness of galaxies is also found.
作者
彭秋和
Peng Qiu-he(The Department of Astronomy,Nanjing University,Nanjing 210008)
出处
《天文学报》
CSCD
北大核心
1992年第4期362-370,共9页
Acta Astronomica Sinica
基金
国家自然科学基金资助
关键词
三维盘状星系
平直旋转曲线
物质密度和恒星速度弥散度分布
Three
dimensional
disk-like
galaxy—Flat
rotation
curve—Distributions
of
mass
surface
density
and
stellar
velocity
dispersion
