标题： 从自洽流体动力学模拟中关于椭圆星系结构和运动学的规律性线索：动力学基本平面 显示英文标题

标题： Clues on Regularity in the Structure and Kinematics of Elliptical Galaxies from Self-consistent Hydrodynamical Simulations: the Dynamical Fundamental Plane

摘要： [简写] 我们分析了在重子尺度和晕尺度上表征质量、大小和速度弥散的参数，这些参数来自两个在z=0时识别出的放松椭圆类物体（ELOs）样本，在一个自洽的流体动力学模拟集合中运行，该集合处于一致宇宙学模型的背景下。 在晕尺度上，它们满足维里关系；在重子物体尺度上，ELO恒星质量的对数值、投影恒星半质量半径和恒星中心视线速度弥散定义了一个接近平面的扁平椭球体（固有动力平面，IDP），相对于维里平面倾斜，其观测表现是观察到的FP。 发现ELO样本在质量尺度上表现出与重子质量和暗物质ELO成分的相对含量和相对分布的系统趋势，因此空间质量分布的同质性被打破（导致IDP倾斜），但ELO仍然是一个两参数族，这两个参数是相关的。 这些趋势的物理起源可能在于随着ELO质量的增加，重子质量成分在ELO恒星质量形成过程中经历的耗散相对量系统性减少。 ELO还表现出动力学分层，但这种分层不会显著随质量尺度变化。 IDP的非同质种群解释了维里质量在确定内在参数相关性中的作用。 在本文中，我们还表明ELO的中心恒星视线速度弥散是一个公平的经验估计量，用于估计维里质量，这解释了该量在确定观测相关性中的核心作用。 显示英文摘要

摘要： [Abridged] We have analysed the parameters characterising the mass, size and velocity dispersion both at the baryonic scale and at the halo scales of two samples of relaxed elliptical-like-objects (ELOs) identified, at z=0, in a set of self-consistent hydrodynamical simulations operating in the context of a concordance cosmological model. At the halo scale they have been found to satisfy virial relations; at the scale of the baryonic object the (logarithms of the) ELO stellar masses, projected stellar half-mass radii, and stellar central l.o.s. velocity dispersions define a flattened ellipsoid close to a plane (the intrinsic dynamical plane, IDP), tilted relative to the virial one, whose observational manifestation is the observed FP. The ELO samples have been found to show systematic trends with the mass scale in both, the relative content and the relative distributions of the baryonic and the dark mass ELO components, so that homology is broken in the spatial mass distribution (resulting in the IDP tilt), but ELOs are still a two-parameter family where the two parameters are correlated. The physical origin of these trends presumably lies in the systematic decrease, with increasing ELO mass, of the relative amount of dissipation experienced by the baryonic mass component along ELO stellar mass assembly. ELOs also show kinematical segregation, but it does not appreciably change with the mass scale. The non-homogeneous population of IDPs explains the role played by the virial mass to determine the correlations among intrinsic parameters. In this paper we also show that the central stellar line-of-sight velocity dispersion of ELOs, is a fair empirical estimator of the virial mass, and this explains the central role played by this quantity at determining the observational correlations.