S0和平坦早型星系的盘动力学和X射线辐射
Disk dynamics and the X-ray emission of S0 and flat early-type galaxies
摘要：
利用二维流体动力学模拟方法，研究了早型星系中热气流的演化，重点讨论了星系自转对ISM热动力学状态的影响。该星系被建模为一个两个组件的轴对称系统（恒星和暗物质），与一个变量的方位角速度色散和旋转的支持，也被认为是存在一个反旋转的恒星盘。结果表明，旋转支撑（各向同性）模型的ISM比全速色散模型更容易发生热不稳定性，但其ISM温度和X射线亮度较低.具有反向旋转的模型显示中间行为。
英文摘要：
With 2D hydrodynamical simulations, we study the evolution of the hot gas flows in early-type galaxies, focussing on the effects of galaxy rotation on the thermal and dynamical status of the ISM. The galaxy is modelled as a two-component axisymmetric system (stars and dark matter), with a variable amount of azimuthal velocity dispersion and rotational support; the presence of a counter rotating stellar disk is also considered. It is found that the ISM of the rotationally supported (isotropic) model is more prone to thermal instabilities than the fully velocity dispersion counterpart, while its ISM temperature and X-ray luminosity are lower. The model with counter rotation shows an intermediate behaviour.
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