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

美法合作研究：星系形成和演化的数值研究

• 批准号: 8815335
• 负责人: Kevin Prendergast
• 金额: $ 1.12万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-03-15 至 1992-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8815335&HistoricalAwards=false
• 关键词: US; France; Cooperative; Research; Numerical

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.

该奖项将支持哥伦比亚大学 Kevin Prendergast 博士和 Evangelie Athanassoulas 博士领导的法国马赛天文台天文学家小组之间的合作研究。 该项目的目标是使用多流体代码来跟踪恒星、气体和暗物质的运动和相互作用，研究星系的结构和演化。 现有的代码体现了恒星的形成、演化和质量损失，以及恒星加热和气体辐射冷却。 与二流体代码的球形版本的集成产生了理论上的 Faber-Jackson 关系，该关系可以与后发星团和室女星团中观测到的椭圆相匹配。 其他结果表明，中等质量的星系会发生排气，而高质量系统则不会。 这可能表明普通系统和矮系统之间存在差异的可能原因。 低质量系统可能会被导致中等质量系统脱气的同一过程完全破坏。 在这个项目中，研究人员将继续使用现有的代码，并构建一个轴对称版本，希望费希尔-塔利关系能够从旋转星系的刺激中出现。 美国和法国研究人员在拟议研究领域拥有丰富的专业知识，该项目将受益于马赛天文台的特殊设施。 这项工作的结果预计将有助于我们对星系结构和演化的理解。