US-France Cooperative Research: Numerical Studies of the Formation and Evolution of Galaxies

该奖项将支持凯文博士与 普伦德加斯特，哥伦比亚大学和一组法国天文学家 来自法国马赛天文台，由Evangelie博士领导 阿萨纳苏拉 该项目的目标是研究银河系 结构和演变使用多流体代码遵循 恒星、气体和暗物质的运动和相互作用 的 现有的代码体现了星星的形成，演化和质量损失， 以及气体的恒星加热和辐射冷却。 用双流体代码的球形版本进行积分， 产生了一个理论上的Faber-Jackson关系， 后发座和室女座星系团中观测到的椭圆星系。 其他 结果表明，中等质量的星系受到 除气，而高质量系统则不会。 这可能表示 普通人和侏儒之间差异的可能原因 系统. 低质量系统可能完全被相同的 在中等质量的系统中导致除气的过程。 在这个项目中，研究人员将继续与 现有的代码，并构建一个轴对称版本，希望 费舍尔-塔利关系将从刺激中产生， 旋转星系 美国和法国的调查人员 在拟议研究领域的重要专业知识，以及 该项目将受益于特殊设施， 马赛天文台。 这项工作的结果预计将 有助于我们理解银河系的结构， 进化

This award will support collaborative research between Dr. Kevin Prendergast, Columbia University and a group of French astronomers from the Observatoire de Marseille, France, led by Dr. Evangelie Athanassoulas. The objective of the project is to study galactic structure and evolution using a multifluid code to follow the motions and interactions of stars, gas and dark matter. The existing code embodies star formation, evolution and mass loss, together with stellar heating and radiative cooling of the gas. Integrations with a spherical version of the two-fluid code have yielded a theoretical Faber-Jackson relation, which can be matched to observed ellipticals in the Coma and Virgo clusters. Other results indicate that galaxies of intermediate mass are subject to outgassing, while high mass systems are not. This may indicate a possible reason for the differences between ordinary and dwarf systems. Low mass systems may be entirely disrupted by the same process which leads to outgassing in systems of intermediate mass. In this project the investigators will continue the work with the existing code, and construct an axisymmetric version, in the hope that the Fisher-Tully relation will emerge from stimulations of rotating galaxies. The U.S. and French investigators have significant expertise in the area of proposed research, and the project will benefit from the special facilities available at the Marseille Observatory. The results of this work are expected to contribute to our understanding of galactic structure and evolution.