天文学进展2017，Vol.35Issue(4)：389-397,9.DOI:10.3969/j.issn.1000-8349.2017.04.01
球状动力学系统的基本面——从椭圆星系到球状星团
The Tilt of Fundamental Plane: from Elliptical Galaxies to Globular Clusters
摘要
Abstract
The fundamental plane (FP) is a scaling relation among effective radius, central velocity dispersion and average surface brightness of spherical dynamical systems, which is expected to be originated from the virial equilibrium of their members. However, observations show that the FPs of elliptical galaxies, as well as globular clusters are both tilted from virial plane. This paper gives an overview on the FP studies of elliptical galaxies and globular clusters and makes comparisons. The non-homologous structure and non-constant mass-to-light ratio are the main reasons of the FP tilt. For elliptical galaxies, the variation of mass-to-light ratio is originated from the change of dark matter fraction and possible variation of the stellar initial mass function in different mass systems. For globular clusters, the two-body relaxation timescale of stars is much shorter, where the dynamical evolution makes the main contribution to their non-constant mass-to-light ratios.关键词
基本面/椭圆星系/球状星团/动力学演化Key words
fundamental plane/elliptical galaxies/globular clusters/dynamical evolution分类
天文与地球科学引用本文复制引用
庞晓莹,沈世银..球状动力学系统的基本面——从椭圆星系到球状星团[J].天文学进展,2017,35(4):389-397,9.基金项目
国家自然科学基金(11503015,11673032,11573050,11433003) （11503015,11673032,11573050,11433003）
973项目(2014CB845705) （2014CB845705）
